Electric connector

Abstract

The utility model discloses an electric connector, which comprises a differential signal pair fixed on an insulating part, the differential signal pair comprises two signal terminals, and each signal terminal comprises a signal fixing part fixed on the insulating part, a signal elastic arm part connected with the signal fixing part and a signal guide connecting part. The insulating part is concavely provided with a groove corresponding to each signal fixing part along the front-back direction so as to expose the signal fixing part, the insulating part is convexly provided with a positioning part between two grooves corresponding to one differential signal pair, the edge, close to the positioning part, of the exposed groove of the signal fixing part is defined as a first edge, and the edge, far away from the positioning part, of the exposed groove is defined as a second edge; a grounding piece is provided with an opening corresponding to the groove, the width of the opening in the left-right direction is larger than the distance between the two second edges of the differential signal pair, the two side edges of the opening in the left-right direction are located on the outer sides of the two second edges, and the positioning part penetrates out of the opening. Therefore, the capacitive property of the signal fixing part is reduced, the inductive property is increased, the integral impedance matching of the signal terminal is realized, and the SI performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an electric connector, especially a high-speed transmission electric connector.

BACKGROUND

[0002] A kind of electric connector for high-speed transmission of prior art, including an insulating body, terminal module arranged in the insulating body and the grounding piece corresponding the terminal module, the terminal module includes an insulating piece and the differential terminal pair fixed to the insulating piece, each differential terminal pair includes two signal terminals, each signal terminal includes fixed part arranged in the insulating piece, elastic arm portion extending from one end of the fixed part and guide connection portion extending from the other end of the fixed part. With the development of electric connector, the performance requirement of signal terminal transmission high frequency is higher and higher, the shielding effect requirement of grounding piece is higher and higher, so the shielding area of shielding sheet is usually increased by the person skilled in the art to improve shielding effect to improve the transmission frequency of the connector, however when the fixed part is also shielded by the grounding piece, the capacitance of the fixed part increases, and then the SI (signal integrity) performance of the signal terminal is affected, and the high-frequency signal transmission of the electric connector is affected.

[0003] Therefore, it is necessary to design a new electric connector to overcome the above problems.

UTILITY MODEL CONTENTS

[0004] To solve the above problems of prior art, the purpose of the utility model is to provide an electric connector, the grounding sheet is provided with an opening, the width of the opening along the left-right direction is greater than the distance between the two second edges of the same differential signal pair, the two side edges of the opening in the left-right direction are located outside the two second edges, and the positioning part penetrates out of the opening, so that the differential signal pair impedance balance.

[0005] To achieve the above object, the utility model discloses an electric connector includes an insulating body, a terminal module is located in the insulating body, the terminal module includes an insulating piece and at least one differential signal pair fixed to the insulating piece, the differential signal pair includes two signal terminals, the signal terminal includes a signal fixed part fixed to the insulating piece, a signal spring arm part extending from one end of the signal fixed part and a signal guide part extending from the other end of the signal fixed part, the width of the signal spring arm part in the left and right directions is greater than the width of the signal fixed part, the insulating piece recesses a groove along the front and back directions for each signal fixed part to expose the signal fixed part, the insulating part between the two grooves of the same differential signal pair is provided with a positioning part, and the edge of the exposed part of each signal fixed part close to the positioning part is defined as the first edge, and the edge away from the positioning part is defined as the second edge, a grounding sheet is located on one side of the terminal module along the front and back directions, the grounding sheet is provided with an opening corresponding to the groove, the width of the opening along the left and right directions is greater than the distance between the two second edges of the same differential signal pair, and the two sides of the opening in the left and right directions are located outside the two second edges, and the positioning part passes through the opening.

[0006] Further, the terminal module further includes at least two grounding terminals respectively arranged on the left and right sides of the differential signal pair, the grounding sheet includes a main body part shielding the differential signal pair and the grounding terminals on the left and right sides thereof and a limiting part located on one side of the main body part, the main body part includes a first section located above the opening and two first contact points extending along the left and right directions from the left and right sides of the first section, a second section located below the opening and two second contact points extending along the left and right directions from the left and right sides of the second section, the two first contact points are arranged in alignment along the left and right directions, the two second contact points are arranged in alignment along the left and right directions, and the first contact point and the second contact point on the same side of the opening along the left and right directions abut against the same grounding terminal.

[0007] Further, the insulating piece is provided with a limiting groove, the limiting part is connected with the main body part and accommodated in the limiting groove, the limiting part includes a first limiting edge matched with the upper wall surface of the limiting groove and a second limiting edge matched with the lower wall surface of the limiting groove, the first contact point and the second contact point are respectively torn from the upper and lower sides of the main body part, and the upper and lower sides of the main body part are formed with a first torn edge higher than the first limiting edge and a second torn edge lower than the first limiting edge.

[0008] Further, the insulating body comprises two side walls extending along the left-right direction and a mounting surface below the two side walls, the signal lead part extends downward from the mounting surface and is electrically connected with the cable, a plastic outer mold is wrapped around the connection between the signal lead part and the cable, the insulating part is arranged in the insulating body from the mounting surface upward, the stopper is below the mounting surface and shields part of the side walls in the front-back direction, and the plastic outer mold is below the stopper and the side walls.

[0009] Further, the two signal fixed parts of the differential signal pair are recessed from the side close to each other to form a first narrow part, a second narrow part and a wide part between the first narrow part and the second narrow part, the width of the wide part in the left-right direction is greater than the width of the signal lead part in the left-right direction, and the second edge on the side of the first narrow part exposes the opening.

[0010] Further, the gap between the two first narrow parts is greater than the gap between the two second narrow parts.

[0011] Further, the signal spring arm part comprises a first vertical part extending out of the insulating part, a first bending part connected with the first vertical part, a first extension part extending from the first bending part, and the gap between the two first extension parts of the differential signal pair gradually decreases from top to bottom.

[0012] Further, the terminal module further comprises at least two ground terminals arranged on the left and right sides of the differential signal pair respectively, the ground terminal comprises a ground fixed part fixed on the insulating part, a ground spring arm part extending from one end of the ground fixed part, and a ground lead part extending from the other end of the ground fixed part, the ground spring arm part comprises a second vertical part extending out of the insulating part, a second bending part connected with the second vertical part, and a second extension part extending from the second bending part, and the width of the second extension part gradually increases toward the second bending part.

[0013] Further, a first insertion slot and a second insertion slot are recessed downward from the mating surface of the insulating body, the terminal module is assembled in the insulating body corresponding to the first insertion slot, the signal spring arm part and the ground spring arm part are exposed in the first insertion slot, a plurality of fish-eye terminals are arranged in the second insertion slot, the fish-eye terminals protrude downward out of the insulating body and are used for being crimped to a circuit board, the signal lead part and the ground lead part are exposed outside the insulating body and are used for being electrically connected with a cable, the center distance between the adjacent ground lead part and signal lead part is not greater than 0.75 mm, and the center distance between the two signal lead parts of the same differential signal pair is not greater than 0.75 mm.

[0014] Further, the insulating body comprises two side walls located at opposite sides of the first slot, and the two side walls respectively comprise oppositely arranged inner wall surfaces, the inner wall surfaces are concavely provided with guide grooves, the positioning part comprises a top surface and a bottom surface which are arranged in parallel in the up-down direction, the size of the top surface in the front-rear direction is smaller than that of the bottom surface, there is an inclined surface between the top surface and the bottom surface, the guide grooves guide the inclined surface, and the bottom surface is clamped in the side wall.

[0015] Compared with the prior art, the utility model has the advantages that the two side edges of the opening are arranged outside the two second edges of the two signal fixing parts of the differential signal pair, part of the two signal fixing parts is exposed from the opening, the shielding area of the ground sheet on the signal fixing part is reduced, the capacitive of the signal fixing part is reduced, the inductive is increased, the overall impedance matching of the signal terminal is realized, and the SI performance is improved; the positioning part is arranged between the two signal fixing parts of the differential signal pair, the opening corresponds to the positioning part, the positioning part protrudes from the opening, the positioning part is assembled to the insulating body, the opening for the positioning part to protrude is not arranged at other positions of the ground sheet, the shielding effect of the ground sheet on other positions is not affected, and the positioning part is convenient for the assembly of the electrical connector. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a perspective view of the electrical connector of the utility model;

[0017] Figure 2 It is Figure 1 It is an exploded view of the conductor and the plastic outer mold;

[0018] Figure 3 It is Figure 1 It is an elevation view;

[0019] Figure 4 It is a sectional view along the A-A sectional line in Figure 3

[0020] Figure 5 It is Figure 4 It is an enlarged view of the B part in

[0021] Figure 6 It is Figure 2 It is an exploded view of the terminal module in

[0022] Figure 7 It is a partial view of the terminal module and the ground sheet;

[0023] Figure 8 It is Figure 7 It is a C partial enlarged view in

[0024] Figure 9 ​A schematic view of a differential signal pair and an insulating member;

[0025] Figure 10 Another perspective view of the terminal module and the grounding sheet.

[0026]

[0027] DETAILED DESCRIPTION

[0028] In order to better understand the purpose, structure and features of the utility model, the utility model will be further described in combination with the drawings and specific embodiments.

[0029] In order to facilitate the understanding of the technical scheme of the utility model, the Z axis in the three-dimensional coordinate axis in the drawings of the specification is defined as the up-down direction, the X axis is defined as the left-right direction, and the Y axis is defined as the front-back direction.

[0030] As shown in Figure 1 and Figure 2 The utility model discloses an electric connector 100, including an insulating body 1, two terminal modules 2 arranged at one end of the insulating body 1, a grounding sheet 3 arranged at one side of each terminal module 2, a plug 4 located between the two terminal modules 2, a plurality of fish eye terminals 6 arranged at the other end of the insulating body 1, the terminals in the terminal module 2 are electrically connected with a cable 7, the fish eye terminals 6 are electrically connected with a circuit board (not shown), the electric connector 100 simultaneously includes the terminal module 2 electrically connected with the cable 7 and the fish eye terminal 6 electrically connected with the circuit board, the fish eye terminal 6 is used to transmit power, and the terminal module 2 is used to transmit low-speed signals and high-speed differential signals.

[0031] As shown in Figure 1 and Figure 4 The insulating body 1 has a pair of interface surfaces 10 and a mounting surface 11 oppositely arranged along the up-down direction, a first insertion slot 121 and a second insertion slot 122 formed by being concave downward from the pair of interface surfaces 10, and two side walls 13 located on the front and back sides of the first insertion slot 121 and the second insertion slot 122. The terminal module 2 is installed in the first insertion slot 121 from bottom to top, the fish eye terminal 6 is installed into the second insertion slot 122 and protrudes downward out of the insulating body 1 to be crimped to the circuit board. Two side walls 13 respectively include an inner wall surface 131 oppositely arranged, the inner wall surface 131 corresponding to the first insertion slot 121 part is concave with a guide groove 14 and a positioning groove 15, the guide groove 14 penetrates to the mounting surface 11, and the guide groove 14 and the positioning groove 15 are correspondingly arranged along the up-down direction.

[0032] As shown in Figure 6 andFigure 7 As shown, the terminal module 2 comprises an insulating member 21, a differential signal pair S fixed to the insulating member 21, and ground terminals G arranged on the left and right sides of the differential signal pair S. The differential signal pair S comprises two signal terminals Sa. Each signal terminal Sa comprises a signal fixing portion S1 fixed to the insulating member 21, a signal spring arm portion S2 extending from one end of the signal fixing portion S1, and a signal lead portion S3 extending from the other end of the signal fixing portion S1. The signal spring arm portion S2 has a greater width in the left-right direction than the signal fixing portion S1. The ground terminal G comprises a ground fixing portion G1 fixed to the insulating member 21, a ground spring arm portion G2 extending from one end of the ground fixing portion G1, and a ground lead portion G3 extending from the other end of the ground fixing portion G1. The signal spring arm portion S2 and the ground spring arm portion G2 extend to the first slot 121 and do not exceed the mating surface 10. The signal lead portion S3 and the ground lead portion G3 extend from the insulating body 1 and are electrically connected to the cable 7 below the mounting surface 11. Specifically, the cable 7 comprises a pair of signal wire cores 71 and two ground wire cores 72. The two signal lead portions S3 are electrically connected to the pair of signal wire cores 71. The center distance between the two signal lead portions S3 of the same differential signal pair S is not greater than 0.75 mm. The two ground lead portions G3 arranged on the left and right sides of the same differential signal pair S are electrically connected to the two ground wire cores 72. The center distance between the ground lead portion G3 and the signal lead portion S3 arranged adjacently is not greater than 0.75 mm.

[0033] As shown, the terminal module 2 comprises an insulating member 21, a differential signal pair S fixed to the insulating member 21, and ground terminals G arranged on the left and right sides of the differential signal pair S. The differential signal pair S comprises two signal terminals Sa. Each signal terminal Sa comprises a signal fixing portion S1 fixed to the insulating member 21, a signal spring arm portion S2 extending from one end of the signal fixing portion S1, and a signal lead portion S3 extending from the other end of the signal fixing portion S1. The signal spring arm portion S2 has a greater width in the left-right direction than the signal fixing portion S1. The ground terminal G comprises a ground fixing portion G1 fixed to the insulating member 21, a ground spring arm portion G2 extending from one end of the ground fixing portion G1, and a ground lead portion G3 extending from the other end of the ground fixing portion G1. The signal spring arm portion S2 and the ground spring arm portion G2 extend to the first slot 121 and do not exceed the mating surface 10. The signal lead portion S3 and the ground lead portion G3 extend from the insulating body 1 and are electrically connected to the cable 7 below the mounting surface 11. Specifically, the cable 7 comprises a pair of signal wire cores 71 and two ground wire cores 72. The two signal lead portions S3 are electrically connected to the pair of signal wire cores 71. The center distance between the two signal lead portions S3 of the same differential signal pair S is not greater than 0.75 mm. The two ground lead portions G3 arranged on the left and right sides of the same differential signal pair S are electrically connected to the two ground wire cores 72. The center distance between the ground lead portion G3 and the signal lead portion S3 arranged adjacently is not greater than 0.75 mm. Figure 9As shown, two signal fixing parts S1 of the differential signal pair S are recessed from the side close to each other with a first narrow part S11, a second narrow part S12 and a wide part S13 between the first narrow part S11 and the second narrow part S12, the width of the wide part S13 in the left-right direction is greater than the width of the signal conducting part S3 in the left-right direction, the gap between two first narrow parts S11 is greater than the gap between two second narrow parts S12, and the gap between two second narrow parts S12 is small, so that the tight coupling of the differential signal pair S improves the crosstalk. The signal spring arm part S2 includes a first vertical part S21 extending out of the insulating member 21, a first bending part S22 connected to the first vertical part S21 by bending, and a first extension part S23 extending from the first bending part S22, the gap between two first extension parts S23 of the differential signal pair S gradually decreases from top to bottom. The ground spring arm part G2 includes a second vertical part S21 extending out of the insulating member 21, a second bending part S22 connected to the second vertical part S21 by bending, and a second extension part S23 extending from the second bending part S22 by bending, the width of the second extension part S23 gradually increases towards the second vertical part S21.

[0034] As Figure 4 , Figure 7 and Figure 9As shown, the insulating member 21 includes a groove 211 recessed in the front-rear direction corresponding to each of the signal fixing portions S1, a positioning portion 212 protruded of an insulating portion between two of the grooves 211 corresponding to the same differential signal pair S, a limiting groove 213 located at one side of the groove 211 in the left-right direction, and a stopper 214 located below the groove 211. The first narrow portion S11 is exposed in the groove 211, the edge of the first narrow portion S11 close to the positioning portion 212 is defined as a first edge S1a, and the edge of the first narrow portion S11 away from the positioning portion 212 is defined as a second edge S1b. The first narrow portion S11 is fixed to the insulating member 21. The dielectric constant of the insulating member 21 is higher than that of air, so that the capacitance of the signal fixing portion S1 is larger, and thus the first narrow portion S11 is exposed in the groove 211 and relatively narrowed to increase the inductance of the signal fixing portion S1, so that the overall impedance of the signal terminal Sa is matched. The limiting groove 213 includes an upper wall surface 213a and a lower wall surface 213b arranged opposite to each other in the up-down direction, and the grounding sheet 3 is positioned between the upper wall surface 213a and the lower wall surface 213b. The positioning portion 212 has a substantially trapezoidal shape in the left-right direction, and includes a top surface 212a and a bottom surface 212b arranged parallel to each other in the up-down direction, and a slope surface 212c arranged between the top surface 212a and the bottom surface 212b. The size of the top surface 212a in the front-rear direction is smaller than the size of the bottom surface 212b in the front-rear direction. When the insulating member 21 is fitted into the insulating body 1, the guide groove 14 guides the slope surface 212c to facilitate fitting of the insulating member 21 into the insulating body 1. When the insulating member 21 is fitted into the insulating body 1, the positioning portion 212 is accommodated in the positioning groove 15, and the bottom surface 212b is clamped in the positioning groove 15. The stopper 214 is located below the mounting surface 11, and in the front-rear direction, the stopper 214 blocks part of the side wall 13.

[0035] As Figure 6 , Figure 7 and Figure 8As shown in the drawings, the ground sheet 3 is located on one side of the terminal module 2 along the front-back direction, the ground sheet 3 comprises a plurality of body parts 31 and a plurality of limiting parts 32, each limiting part 32 is located on one side of one body part 31, each body part 31 shields one differential signal pair S and the ground terminals G on both sides of the differential signal pair S, and each limiting part 32 is positioned between the upper wall surface 213a and the lower wall surface 213b. The body part 31 comprises an opening 311, a first section 312 located above the opening 311, two first contact points 313 extending from the left and right sides of the first section 312 along the left-right direction, a second section 314 located below the opening 311, two second contact points 315 extending from the left and right sides of the second section 314 along the left-right direction, a first tearing edge 316 and a second tearing edge 317 formed by tearing the body part 31, the first contact points 313 and the second contact points 315 respectively, the two first contact points 313 are arranged in alignment along the left-right direction, the two second contact points 315 are arranged in alignment along the left-right direction, and the first contact points 313 and the second contact points 315 located on the same side of the opening 311 along the left-right direction abut against the same ground terminal G. The two side edges 311a of the opening 311 in the left-right direction are located outside the two first edges S1a, that is, the two first narrow parts S11 are exposed in the opening 311, and the positioning part 212 on the insulating part 21 protrudes from the opening 311. The limiting part 32 comprises a first limiting edge 321 clamped with the upper wall surface 213a and a second limiting edge 322 clamped with the lower wall surface 213b, the first tearing edge 316 is higher than the first limiting edge 321, and the second tearing edge 317 is lower than the first limiting edge 321. Of course, in other embodiments, the ground sheet 3 can also comprise only one body part 31 and two limiting parts 32 located on both sides of the body part 31, and the body part 31 can also be provided with only one first contact point 313 on any one side along the left-right direction.

[0036] As shown in the drawings, Figure 2 and Figure 4 As shown in the drawings, the electric connector 100 further comprises a plug 4, two outer surfaces of the plug 4 extending along the left-right direction are concavely provided with a plurality of channels 41, and the signal lead S3 and the ground lead G3 are accommodated in the channels 41. After the signal lead S3 and the ground lead G3 are electrically connected with the cable 7, the electric connector 100 injects a plastic outer mold 5 at the connection between the cable and the signal lead S3 and the ground lead G3, and the plastic outer mold 5 is below the mounting surface 11 and the stopper 214.

[0037] The electric connector of the utility model further has the following beneficial effects:

[0038] 1. The two side edges 311a of the opening 311 are arranged outside the two second edges S1b, so that a portion of the two signal fixing portions S1 is exposed from the opening 311, reducing the shielding area of ​​the grounding plate 3 on the signal fixing portion S1, so that the capacitance of the signal fixing portion S1 is reduced and the inductance is increased, thereby balancing the overall impedance of the signal terminal Sa and improving the SI performance of the signal terminal Sa.

[0039] The opening 311 is provided corresponding to the positioning portion 212, thereby avoiding the need to provide the opening 311 at other positions of the grounding plate 3 for the positioning portion 212 to protrude, thereby ensuring the shielding effect of the grounding plate 3 on other positions of the signal terminal Sa, and providing the positioning portion 212 to facilitate the assembly and positioning of the grounding plate 3, the terminal module 2 and the insulating body 1.

[0040] 2. The two first contacts 313 extend from the first section 312 in the left-right direction and are aligned. The two first contacts 313 respectively contact the two ground terminals G on either side of the differential signal pair S. The connection path between the two first contacts 313 and the first section 312 is a straight line. This straight line path is shorter than the curved path formed by the misalignment of the two first contacts 313 and the first section 312. The return path between the two ground terminals G is short, which can more quickly guide away noise signals and facilitate signal transmission. Similarly, the return path between the two second contacts 315 and the second section 314 and the ground terminals G is also straight, which facilitates signal transmission. Furthermore, the return paths of the first contacts 313 and the second contacts 315 function simultaneously, which can more quickly guide noise signals and facilitate signal transmission.

[0041] 3. The first tearing edge 316 and the second tearing edge 317 will be pulled and deformed when tearing and forming the first connection point 313 and the second connection point 315. The first limiting edge 321 is lower than the first tearing edge 316. The pulling during the formation of the first connection point 313 will not affect the size of the first limiting edge 321, thereby ensuring the dimensional accuracy of the first limiting edge 321, facilitating the positioning of the first limiting edge 321 and the upper wall surface 213a, and facilitating manufacturing.

[0042] 4. The stopper 214 is below the mounting surface 11 and partially blocks the side wall 13. The plastic outer mold 5 is below the mounting surface 11 and the stopper 214. The stopper 214 blocks part of the side wall 13 to prevent the colloid of the plastic outer mold 5 from flowing back into the insulating body 1 when the plastic outer mold 5 is injected into the electrical connector 100, thereby affecting the conductive performance of the electrical connector 100.

[0043] 5. Since the capacitance at the electrical connection between the signal conducting portion S3 and the cable 7 is relatively high, the width of the signal conducting portion S3 is set to be smaller than the width of the first wide portion S13 of the signal fixing portion S1. Reducing the width of the signal conducting portion S3 reduces the capacitance of the conducting portion, thereby reducing the capacitance difference between the signal fixing portion S1 and the signal conducting portion S3, thereby achieving an impedance balance effect.

[0044] 6. The gap between the first extension parts S23 gradually decreases, and the first extension part S23 changes evenly from its upper end to the lower end. This uniform transition makes the surface stress of the first extension part S23 evenly distributed, enhances the structural strength of the flare arm S2, and the gradual change of the first extension part S23 makes the impedance change value of the first extension part S23 relatively gentle, which is more conducive to signal transmission.

[0045] 7. The width of the second extension portion S23 gradually widens, and the second extension portion S23 transitions evenly from its upper end to its lower end. This even transition makes the surface stress of the second extension portion S23 evenly distributed, thereby enhancing the structural strength of the grounding elastic arm portion G2.

[0046] 8. The center-to-center distance between the signal conductive portion S3 and the ground conductive portion G3 is no greater than 0.75 mm, and the center-to-center distance between two signal conductive portions S3 is no greater than 0.75 mm. This eliminates the need to strip a long length of copper foil from the cable 7 to match the center-to-center distance between the two signal conductive portions S3 or the center-to-center distance between the signal conductive portion S3 and the ground conductive portion G3. This prevents excessively high impedance resulting from stripping a longer copper foil when multiple cores in the cable 7 are soldered to the signal conductive portion S3 or the ground conductive portion G3, thereby affecting SI performance. Therefore, matching the distance between the signal conductive portions S3 and the distance between the signal conductive portion S3 and the ground conductive portion G3 with the distance between the conductors in the cable 7 allows for better transmission of high-frequency signals.

[0047] 9. The gap between the two first narrow portions S11 is larger than the gap between the two second narrow portions S12, and the gap between the two second narrow portions S12 is smaller, thereby facilitating tight coupling of the differential signal pair S and improving crosstalk.

[0048] The above detailed description is only an illustration of the preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Therefore, all equivalent technical changes made by using the description and illustrations of this invention are included in the patent scope of this invention.

Claims

1. An electrical connector, characterized by, The application relates to a terminal module, comprising: an insulating body; a terminal module arranged on the insulating body, the terminal module comprising an insulating piece and at least one differential signal pair fixed on the insulating piece, the differential signal pair comprising two signal terminals, the signal terminal comprising a signal fixed part fixed on the insulating piece, a signal spring arm part extending from one end of the signal fixed part and a signal lead part extending from the other end of the signal fixed part, the signal spring arm part having a width greater than that of the signal fixed part in the left-right direction, the insulating piece being provided with a groove corresponding to each signal fixed part in the front-rear direction for exposing the signal fixed part, and the insulating part between the two grooves of the same differential signal pair being provided with a positioning part, the edge of the exposed part of each signal fixed part close to the positioning part being defined as a first edge, and the edge far away from the positioning part being defined as a second edge; a grounding sheet arranged on one side of the terminal module in the front-rear direction, the grounding sheet being provided with an opening corresponding to the groove, the opening having a width greater than the distance between the two second edges of the same differential signal pair in the left-right direction, and the two sides of the opening in the left-right direction being located outside the two second edges, and the positioning part penetrating out of the opening.

2. The electrical connector of claim 1, wherein: The terminal module further comprises at least two grounding terminals arranged on the left and right sides of the differential signal pair respectively, the grounding sheet comprising a main part shielding the differential signal pair and the grounding terminals on the left and right sides thereof and a limiting part arranged on one side of the main part, the main part comprising a first section arranged above the opening, two first contact points extending from the left and right sides of the first section in the left-right direction, a second section arranged below the opening and two second contact points extending from the left and right sides of the second section in the left-right direction, the two first contact points being arranged in alignment in the left-right direction, the two second contact points being arranged in alignment in the left-right direction, and the first contact point and the second contact point on the same side of the opening in the left-right direction abutting against the same grounding terminal.

3. The electrical connector of claim 2, wherein: The insulating piece is provided with a limiting groove, the limiting part is connected with the main part and accommodated in the limiting groove, the limiting part comprising a first limiting edge matched with the upper wall surface of the limiting groove and a second limiting edge matched with the lower wall surface of the limiting groove, the first contact point and the second contact point being respectively torn from the upper and lower sides of the main part and forming a first torn edge higher than the first limiting edge and a second torn edge lower than the first limiting edge.

4. The electrical connector of claim 1, wherein: The insulating body includes two side walls extending in the left-right direction and a mounting surface below the two side walls, the signal lead part extends downward from the mounting surface and is electrically connected with a cable, a plastic outer mold is wrapped around the connection between the signal lead part and the cable, the insulating part is provided with a stopper, the insulating part is upwardly installed in the insulating body from the mounting surface, the stopper is below the mounting surface, and the stopper shields part of the side walls in the front-rear direction, and the plastic outer mold is below the stopper and the side walls.

5. The electrical connector of claim 1, wherein: The two signal fixed parts of the differential signal pair are recessed from a side close to each other to have a first narrow part, a second narrow part, and a wide part between the first narrow part and the second narrow part, the wide part has a width in the left-right direction greater than a width of the signal lead part in the left-right direction, and the second edge on the side of the first narrow part exposes the opening.

6. The electrical connector of claim 5, wherein: The gap between the two first narrow parts is greater than the gap between the two second narrow parts.

7. The electrical connector of claim 1, wherein: The signal spring arm part includes a first vertical part extending out of the insulating part, a first bending part connected with the first vertical part, and a first extension part extending from the first bending part, and the gap between the two first extension parts of the differential signal pair gradually decreases from top to bottom.

8. The electrical connector of claim 1, wherein: The terminal module further includes at least two ground terminals respectively arranged on the left and right sides of the differential signal pair, the ground terminal includes a ground fixed part fixed on the insulating part, a ground spring arm part extending from one end of the ground fixed part, and a ground lead part extending from the other end of the ground fixed part, the ground spring arm part includes a second vertical part extending out of the insulating part, a second bending part connected with the second vertical part, and a second extension part extending from the second bending part, and the width of the second extension part gradually increases toward the second bending part.

9. The electrical connector of claim 8, wherein: A first insertion slot and a second insertion slot are recessed downward from the mating surface of the insulating body, the terminal module is assembled on the insulating body corresponding to the first insertion slot, the signal spring arm part and the ground spring arm part are exposed to the first insertion slot, a plurality of fish-eye terminals are arranged in the second insertion slot, the fish-eye terminals protrude downward out of the insulating body and are used to be crimped to a circuit board, the signal lead part and the ground lead part are exposed outside the insulating body and are used to be electrically connected with a cable, the center distance between the adjacent ground lead part and signal lead part is not greater than 0.75 mm, and the center distance between the two signal lead parts of the same differential signal pair is not greater than 0.75 mm.

10. The electrical connector of claim 9, wherein: The insulating body includes two side walls on opposite sides of the first insertion slot, and the two side walls respectively include oppositely arranged inner wall surfaces, the inner wall surfaces are recessed with guide grooves, the positioning part includes a top surface and a bottom surface arranged in parallel in the up-down direction, the size of the top surface in the front-rear direction is smaller than that of the bottom surface, there is an inclined surface between the top surface and the bottom surface, the guide groove guides the inclined surface, and the bottom surface is clamped in the side wall.

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