Stacking structure of dual electrical connectors of USB type a

Abstract

A universal serial bus type A dual electrical connector stack structure includes a first electrical connector, a second electrical connector, and a circuit board. The first electrical connector includes a plurality of first terminals, a first insulating structure, and a first metal housing. The second electrical connector includes a plurality of second terminals, a second insulating structure, and a second metal housing. The first terminals and the second terminals are electrically connected to the circuit board. The mating direction of the first pair of interfaces of the first metal housing is the same as the mating direction of the second pair of interfaces of the second metal housing, and the first pair of interfaces is flush with the second pair of interfaces. The mating direction of the first pair of interfaces and the second pair of interfaces is perpendicular to the normal direction of the circuit board, and the distance between the first pair of interfaces and the circuit board is greater than the distance between the second pair of interfaces and the circuit board.

Description

Technical Field

[0001] This invention relates to the technical field of electrical connectors, and in particular to a universal serial bus type A dual electrical connector stacking structure. Prior Technology

[0002] Universal Serial Bus Type-A (USB-A) interfaces are commonly found in various electronic devices. For example, desktop computer mainframes typically have multiple USB-A interfaces. These USB-A interfaces are often arranged side-by-side to facilitate miniaturization of the electronic device. Therefore, a design is desired that allows USB-A interfaces to be arranged side-by-side to further reduce the size of the electronic device. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a universal serial bus type A dual electrical connector stacking structure that can be applied to various electronic devices to realize a structure in which multiple universal serial bus type A interfaces are arranged in parallel.

[0004] An embodiment of the universal serial bus type A dual electrical connector stacking structure of the present invention includes a first electrical connector, a second electrical connector, and a circuit board. The first electrical connector includes a plurality of first terminals, a first insulating structure, and a first metal housing. The plurality of first terminals are coupled to the first insulating structure, and the first metal housing covers the first insulating structure and forms a first pair of interfaces. The second electrical connector includes a plurality of second terminals, a second insulating structure, and a second metal housing. The plurality of second terminals are coupled to the second insulating structure, and the second metal housing covers the second insulating structure and forms a second pair of interfaces. The first terminals are electrically connected to the circuit board, and the second terminals are electrically connected to the circuit board. The first insulating structure and the second insulating structure are arranged parallel to each other. The mating direction of the first pair of interfaces is the same as the mating direction of the second pair of interfaces, and the first pair of interfaces is flush with the second pair of interfaces. The mating direction of the first pair of interfaces and the second pair of interfaces is perpendicular to the normal direction of the circuit board, and the distance between the first pair of interfaces and the circuit board is greater than the distance between the second pair of interfaces and the circuit board. Both the first electrical connector and the second electrical connector are universal serial bus type A electrical connectors.

[0005] In another embodiment, each first terminal includes a first mating portion, a first fixing portion, and a first welding portion. The first fixing portion connects the first mating portion and the first welding portion. The first mating portions of the first terminals are arranged in two rows, and the first fixing portions and the first welding portions of the first terminals are arranged in one row. Each second terminal includes a second mating portion, a second fixing portion, and a second welding portion. The second fixing portion connects the second mating portion and the second welding portion. The second mating portions of the second terminals are arranged in two rows, and the second fixing portions and the second welding portions of the second terminals are arranged in one row.

[0006] In another embodiment, the first terminal includes a pair of first conventional signal terminals, a first power supply terminal, a first conventional column ground terminal, two pairs of first high-frequency signal terminals, and a first high-frequency column ground terminal. The first mating portions of the pair of first conventional signal terminals, the first power supply terminal, and the first conventional column ground terminal are arranged to form a first conventional signal column, and the first mating portions of the two pairs of first high-frequency signal terminals and the first high-frequency column ground terminal are arranged to form a first high-frequency signal column. The second terminal includes a pair of second conventional signal terminals, a second power supply terminal, a second conventional column ground terminal, two pairs of second high-frequency signal terminals, and a second high-frequency column ground terminal. The second mating portions of the pair of second conventional signal terminals, the second power supply terminal, and the second conventional column ground terminal are arranged to form a second conventional signal column, and the second mating portions of the two pairs of second high-frequency signal terminals and the second high-frequency column ground terminal are arranged to form a second high-frequency signal column.

[0007] In another embodiment, the first fixed portion of the first high-frequency column grounding terminal forms two first bifurcations, and the first fixed portion of a pair of first conventional column grounding terminals is located between the two first bifurcations, and the first fixed portion of the first conventional column grounding terminal and one of the first bifurcations form an integrated structure.

[0008] In another embodiment, the circuit board has a plurality of through holes arranged in a plurality of columns, a first solder joint is inserted into one column of through holes, an integrated structure corresponds to two adjacent through holes, and the integrated structure is connected to one first solder joint, and another first branch is connected to one first solder joint.

[0009] In another embodiment, the second fixing portion of the second high-frequency column grounding terminal forms two second bifurcations, and the second fixing portions of a pair of second conventional column grounding terminals are located between the two second bifurcations, and the second fixing portion of the second conventional column grounding terminal and one of the second bifurcations form an integrated structure.

[0010] In another embodiment, the circuit board has a plurality of through holes arranged in a plurality of columns, a second solder joint is inserted into one of the columns of through holes, an integrated structure corresponds to two adjacent through holes, and the integrated structure is connected to one second solder joint, and another second branch is connected to one second solder joint.

[0011] In another embodiment, the first terminal further includes two first auxiliary terminals, which are disposed on both sides of the first fixed portion arranged in a row and respectively close to the two first high-frequency terminal pairs; the second terminal further includes two second auxiliary terminals, which are disposed on both sides of the second fixed portion arranged in a row and respectively close to the two second high-frequency terminal pairs.

[0012] In another embodiment, the first insulating structure includes a first tongue portion and a first base portion connected to the first tongue portion, a first mating portion of the first terminal is disposed on the first tongue portion, a first fixing portion of the first terminal is coupled to the first base portion, and the first mating portions of the two first auxiliary terminals are located outside the first tongue portion; the second insulating structure includes a second tongue portion and a second base portion connected to the second tongue portion, a second mating portion of the second terminal is disposed on the second tongue portion, a second fixing portion of the second terminal is coupled to the second base portion, and the second mating portions of the two second auxiliary terminals are located outside the second tongue portion.

[0013] In another embodiment, both the first base and the second base abut against the circuit board. The length of the first base is greater than the length of the second base. The first base has a receiving recess at its adjoining position with the circuit board, and the second base is received in the receiving recess. The portion of the first metal shell covering the first tongue plate portion and the portion of the second metal shell covering the second tongue plate portion are separated from each other by a predetermined distance.

[0014] The universal serial bus type A dual electrical connector stacking structure of the present invention enables the universal serial bus type A to be arranged in parallel by overlapping the first electrical connector and the second electrical connector, both of which are universal serial bus type A electrical connectors. Simple Explanation of the Diagram

[0015] Figure 1 is a perspective view of an embodiment of the universal sequential bus type A dual electrical connector stacking structure of the present invention. Figure 2 is a perspective view of the universal sequential bus type A dual electrical connector stack structure of Figure 1 from another angle. Figure 3 is a partial exploded perspective view of the stacked structure of the universal sequence bus type A dual electrical connector in Figure 1. Figure 4 is a perspective view of the first and second terminals of the universal serial bus type A dual electrical connector stack structure in Figure 1 combined with the circuit board. Figure 5 is a perspective view of the universal sequence bus type A dual electrical connector stack structure shown in Figure 4 from another angle. Figure 6 is a partial exploded perspective view of the stacked structure of the universal sequence bus type A dual electrical connector shown in Figure 5. Implementation

[0016] Please refer to Figures 1, 2, and 3, which illustrate an embodiment of the universal serial bus type A dual electrical connector stacking structure of the present invention. This embodiment of the universal serial bus type A dual electrical connector stacking structure includes a first electrical connector 10, a second electrical connector 20, a circuit board 30, and a metal protective cover 40. The second electrical connector 20 is disposed abutting against the circuit board 30, and the first electrical connector 10 is located above the second electrical connector 20, with a predetermined distance between them. Both the first electrical connector 10 and the second electrical connector 20 are electrically connected to the circuit board 30, thus forming a stacked structure of dual electrical connectors. The metal protective cover 40 covers the first electrical connector 10 and the second electrical connector 20. In this embodiment, both the first electrical connector 10 and the second electrical connector 20 are universal serial bus type A electrical connectors.

[0017] The first electrical connector 10 includes a plurality of first terminals 11, a first insulating structure 12, and a first metal housing 13. The plurality of first terminals 11 are coupled to the first insulating structure 12, and the first metal housing 13 covers the first insulating structure 12 and forms a first mating interface 131.

[0018] Each first terminal 11 includes a first mating portion 111, a first fixing portion 112, and a first welding portion 113. The first fixing portion 112 connects the first mating portion 111 and the first welding portion 113. The first mating portions 111 of the first terminals 11 are arranged in two rows, and the first fixing portions 112 and the first welding portions 113 of the first terminals 11 are arranged in one row.

[0019] The plurality of first terminals 11 include a pair of first conventional signal terminals 11a, a first power supply terminal 11b, a first conventional column ground terminal 11c, two pairs of first high-frequency signal terminals 11d, a first high-frequency column ground terminal 11e, and two first auxiliary terminals 11f. The first mating portions 111 of the pair of first conventional signal terminals 11a, the first power supply terminal 11b, and the first conventional column ground terminal 11c are arranged to form a first conventional signal column, and the first mating portions 111 of the two pairs of first high-frequency signal terminals 11d and the first high-frequency column ground terminal 11e are arranged to form a first high-frequency signal column.

[0020] Please refer to Figures 4, 5, and 6 together. The configuration of the first mating portions 111 of the plurality of first terminals 11 conforms to the specification of the Universal Sequence Bus Type A connector. The arrangement of the first fixing portions 112 of the plurality of first terminals 11 is as follows: the first fixing portions 112 of a pair of first conventional signal terminals 11a are located in the center; the first fixing portions 112 of the first high-frequency column ground terminal 11e form two first bifurcations 11e1 and 11e2, and the first fixing portions 112 of a pair of first conventional column ground terminals 11a are located between the two first bifurcations 11e1 and 11e2; the first fixing portion 112 of the first power terminal 11b is located on the side of the first bifurcation 11e2 away from the first conventional signal terminal 11a; the first fixing portion 112 of the first conventional column ground terminal 11c is located on the first bifurcation. 11e1 is located on the side away from the first conventional signal terminal 11a, and the first fixed part 112 of the first conventional column ground terminal 11c is connected to the first branch part 11e1 to form an integrated structure; the first fixed parts 112 of the two pairs of first high-frequency signal terminals 11d are respectively located on the side of the first power terminal 11b away from the first branch part 11e2 and the side of the first conventional column ground terminal 11c away from the first branch part 11e1; the two first auxiliary terminals 11f are respectively located on the side of the first high-frequency signal terminal 11d away from the first power terminal 11b and the side of the first high-frequency signal terminal 11d away from the first conventional column ground terminal 11c.

[0021] In this embodiment, the first auxiliary terminal 11f overlaps with the first metal housing 13, and the first auxiliary terminal 11f forms an electrical connection with the ground layer in the circuit board 30, thereby grounding the first metal housing 13. Thus, the first auxiliary terminal 11f can be used to provide electromagnetic shielding for the first high-frequency signal terminal 11d. The position of the first mating portion 111 of the first auxiliary terminal 11f corresponds to the position of the first fixing portion 112 of the first high-frequency signal terminal 11d.

[0022] The first insulating structure 12 includes a first tongue plate portion 121 and a first base portion 122 connected to the first tongue plate portion 121. A first mating portion 111 of a first terminal 11 is disposed on the first tongue plate portion 121, and a first fixing portion 112 of the first terminal 11 is coupled to the first base portion 122. The first mating portions 111 of the two first auxiliary terminals 11f are located on the outside of the first tongue plate portion 121. The first base portion 122 is connected to the first tongue plate portion 121 to form an L-shape, and the first base portion 122 abuts against the circuit board 30.

[0023] The second electrical connector 20 includes a plurality of second terminals 21, a second insulating structure 22, and a second metal housing 23. The plurality of second terminals 21 are coupled to the second insulating structure 22, and the second metal housing 23 covers the second insulating structure 22 and forms a second interface 231.

[0024] Each second terminal 21 includes a second mating portion 211, a second fixing portion 212, and a second welding portion 213. The second fixing portion 212 connects the second mating portion 211 and the second welding portion 213. The second mating portions 211 of the second terminals 21 are arranged in two rows, and the second fixing portions 212 and the second welding portions 213 of the second terminals 21 are arranged in one row.

[0025] The second terminal 21 includes a pair of second conventional signal terminals 21a, a second power supply terminal 21b, a second conventional column ground terminal 21c, two pairs of second high-frequency signal terminals 21d, a second high-frequency column ground terminal 21e, and two second auxiliary terminals 21f. The second mating portions 211 of the pair of second conventional signal terminals 21a, the second power supply terminal 21b, and the second conventional column ground terminal 21c are arranged to form a second conventional signal column, and the second mating portions 211 of the two pairs of second high-frequency signal terminals 21d and the second high-frequency column ground terminal 21e are arranged to form a second high-frequency signal column.

[0026] The configuration of the second mating portions 211 of the plurality of second terminals 21 conforms to the specification of the Universal Sequence Bus Type A connector. The arrangement of the second fixing portions 212 of the plurality of second terminals 21 is as follows: the second fixing portions 212 of a pair of second conventional signal terminals 21a are located in the center; the second fixing portions 212 of the second high-frequency column ground terminal 21e form two second bifurcations 21e1 and 21e2, and the second fixing portions 212 of a pair of second conventional column ground terminals 21a are located between the two second bifurcations 21e1 and 21e2; the second fixing portion 212 of the second power terminal 21b is located at the second bifurcation 21e2 away from the second conventional signal terminals. On one side of 21a; the second fixing part 212 of the second conventional column grounding terminal 21c is located on the side of the second branch 21e1 away from the second conventional signal terminal 21a, and the second fixing part 212 of the second conventional column grounding terminal 21c is connected to the second branch 21e1 to form an integrated structure; the second fixing parts 212 of the two pairs of second high frequency signal terminals 21d are respectively located on the side of the second power terminal 21b away from the second branch 21e2 and the side of the second conventional column grounding terminal 21c away from the second branch 21e1.

[0027] Two second auxiliary terminals 21f are located on the side of the second high-frequency signal terminal 21d away from the second power supply terminal 21b and the side of the second high-frequency signal terminal 21d away from the second conventional ground terminal 21c, respectively. In this embodiment, the second auxiliary terminal 21f overlaps with the second metal housing 23, and the second auxiliary terminal 21f forms an electrical connection with the ground layer in the circuit board 30, thereby grounding the second metal housing 23. Thus, the second auxiliary terminal 21f can be used to provide electromagnetic shielding for the second high-frequency signal terminal 21d. The position of the second mating portion 211 of the second auxiliary terminal 21f corresponds to the position of the second fixing portion 22 of the second high-frequency signal terminal 21d.

[0028] The circuit board 30 has a plurality of through holes 31 arranged in a plurality of columns. A plurality of first terminals 11 have first solder portions 113 inserted into one column of through holes 31, and a plurality of second terminals 21 have second solder portions 213 inserted into an adjacent column of through holes 31. This allows the plurality of first terminals 11 and the plurality of second terminals 21 to be electrically connected to the circuit board 30. A first fixing portion 112 of a first conventional column grounding terminal 11c is connected to a first branch portion 11e1 to form an integrated structure. This integrated structure is connected to a first solder portion 113. The integrated structure corresponds to three adjacent through holes 31, but the first solder portion 113 connected to the integrated structure is only inserted into the through hole 31 arranged in the middle of the three. Another first branch portion 11e2 corresponds to two adjacent through holes 31 and is connected to a first solder portion 113, with the first solder portion 113 inserted into one of the two through holes 31.

[0029] A plurality of second terminals 21 have second welding portions 213 inserted into one row of through holes 31. The second fixing portion 212 of the second conventional row grounding terminal 21c is connected to the second branch portion 21e1 to form an integrated structure. The integrated structure is connected to one second welding portion 213. The integrated structure corresponds to three adjacent through holes 31, and the second welding portion 213 is only inserted into the through hole 31 arranged in the middle of the three. Another second branch portion 21e2 corresponds to two adjacent through holes 31 and is connected to one second welding portion 213. The second welding portion 213 is inserted into one of the two through holes 31.

[0030] The second insulating structure 22 includes a second tongue portion 221 and a second base portion 222 connected to the second tongue portion 221. A second mating portion 211 of the second terminal 21 is disposed on the second tongue portion 221, and a second fixing portion 212 of the second terminal 21 is coupled to the second base portion 222. The second mating portions 211 of the two second auxiliary terminals 21f are located outside the second tongue portion 221. The second base portion 222 abuts against the circuit board 30. The length of the second base portion 222 is less than the length of the first base portion 122. The first base portion 122 has a receiving recess 122a adjacent to the circuit board 30, and the second base portion 222 is accommodated within the receiving recess 122a, such that the surface of the second base portion 222 is flush with the surface of the first base portion 122. The first tongue portion 121 and the second tongue portion 221 are arranged in parallel, and the first base portion 122 and the second base portion 222 are arranged in parallel.

[0031] The mating direction of the first pair of interfaces 131 of the first metal housing 13 is the same as the mating direction of the second pair of interfaces 231 of the second metal housing 23, and the first pair of interfaces 131 and the second pair of interfaces 231 are flush. The mating direction of the first pair of interfaces 131 and the second pair of interfaces 231 is perpendicular to the normal direction of the circuit board 30, and the distance between the first pair of interfaces 131 and the circuit board 30 is greater than the distance between the second pair of interfaces 231 and the circuit board 30. The portion of the first metal housing 13 covering the first tongue plate portion 121 and the portion of the second metal housing 23 covering the second tongue plate portion 221 are separated from each other by a predetermined distance.

[0032] As shown in Figure 2, the metal protective cover 40 includes a front cover 41 and a rear cover 42. The front cover covers the top of the first electrical connector 10 and the front of the first electrical connector 10 and the second electrical connector 20, while the rear cover 42 covers the sides and rear of the first electrical connector 10 and the second electrical connector 20. The front cover 41 has two openings, which are respectively aligned with the first pair of interfaces 131 and the second pair of interfaces 231.

[0033] The universal serial bus type A dual electrical connector stacking structure of the present invention enables the universal serial bus type A to be arranged in parallel by overlapping the first electrical connector and the second electrical connector, both of which are universal serial bus type A electrical connectors.

[0034] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention are still within the scope of the patent. Furthermore, no embodiment or claim of the present invention needs to achieve all the objectives, advantages, or features disclosed in the present invention. In addition, the abstract and headings are merely for assisting in patent document searches and are not intended to limit the scope of the present invention. Furthermore, the terms "first," "second," etc., used in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not intended to limit the upper or lower limit of the number of elements.

[0035] 10: First electrical connector 11: First terminal 11a: First conventional signal terminal 11b: First power supply terminal 11c: First conventional column grounding terminal 11d: First high-frequency signal terminal 11e: First high-frequency column grounding terminal 11f: First auxiliary terminal 11e1, 11e2: First bifurcation 12: First insulation structure 13: First metal casing 20: Second electrical connector 21: Second terminal 21a: Second conventional signal terminal 21b: Second power supply terminal 21c: Second conventional column grounding terminal 21d: Second high-frequency signal terminal 21e: Second high-frequency column grounding terminal 21f: Second auxiliary terminal 21e1, 21e2: Second bifurcation 22: Second insulation structure 23: Second metal casing 30: Circuit board 31: Through hole 40: Metal protective cover 41: Front Cover 42:Rear cover body 111: First docking section 112: First fixed joint 113: First Welding Section 121: First tongue plate 122: First base 122a: accommodation recess 131: First pair of interfaces 211: Second docking section 212: Second fixed joint 213: Second Welding Section 221: Second tongue plate 222: Second base 231: Second pair of interfaces

Claims

1. A universal serial bus type A dual electrical connector stacking structure, comprising: A first electrical connector includes a plurality of first terminals, a first insulating structure, and a first metal housing, wherein the first terminals are coupled to the first insulating structure, and the first metal housing covers the first insulating structure and forms a first pair of interfaces; a second electrical connector includes a plurality of second terminals, a second insulating structure, and a second metal housing, wherein the second terminals are coupled to the second insulating structure, and the second metal housing covers the second insulating structure and forms a second pair of interfaces; and a circuit board, wherein the first terminals are electrically connected to the circuit board, and the second terminals are electrically connected to the circuit board; wherein the first insulating structure and the second insulating structure are arranged parallel to each other, the mating direction of the first pair of interfaces is the same as the mating direction of the second pair of interfaces, the first pair of interfaces and the second pair of interfaces are flush, and the mating direction of the first pair of interfaces and the second pair of interfaces is perpendicular to the normal direction of the circuit board, and the distance between the first pair of interfaces and the circuit board is greater than the distance between the second pair of interfaces and the circuit board; wherein both the first electrical connector and the second electrical connector are Universal Sequence Bus Type A connectors; Each of the first terminals includes a first mating portion, a first fixing portion, and a first welding portion. The first fixing portion connects the first mating portion and the first welding portion. The first mating portions of the first terminals are arranged in two rows, and the first fixing portions and the first welding portions of the first terminals are arranged in one row. Each of the second terminals includes a second mating portion, a second fixing portion, and a second welding portion. The second fixing portion connects the second mating portion and the second welding portion. The second mating portions of the second terminals are arranged in two rows, and the second fixing portions and the second welding portions of the second terminals are arranged in one row. Each of the first terminals includes a first high-frequency column grounding terminal and a first conventional column grounding terminal. The first fixing portion of the first high-frequency column grounding terminal forms two first bifurcations, and the first fixing portions of a pair of first conventional column grounding terminals are located between the two first bifurcations. The first fixing portion of the first conventional column grounding terminal and one of the first bifurcations form an integrated structure. The circuit board has a plurality of through holes arranged in a plurality of columns. The first solder joints are inserted into one column of the through holes. The width of the integrated structure is greater than the width of the first fixing part of the other first terminals. The integrated structure corresponds to two adjacent through holes and is connected to one of the first solder joints. Another first branch is connected to one of the first solder joints.

2. The universal serial bus type A dual electrical connector stacking structure as described in claim 2, wherein the first terminals further include a pair of first conventional signal terminals, a first power terminal, and two pairs of first high-frequency signal terminals; the first mating portions of the pair of first conventional signal terminals, the first power terminal, and the first conventional column ground terminal are arranged to form a first conventional signal column; and the first mating portions of the two pairs of first high-frequency signal terminals and the first high-frequency column ground terminal are arranged to form a first high-frequency signal column. The second terminals include a pair of second conventional signal terminals, a second power terminal, a second conventional column ground terminal, two pairs of second high-frequency signal terminals, and a second high-frequency column ground terminal; the second mating portions of the pair of second conventional signal terminals, the second power terminal, and the second conventional column ground terminal are arranged to form a second conventional signal column; and the second mating portions of the two pairs of second high-frequency signal terminals and the second high-frequency column ground terminal are arranged to form a second high-frequency signal column.

3. The universal serial bus type A dual electrical connector stacking structure as claimed in claim 1, wherein the second fixing portion of the second high-frequency column ground terminal forms two second bifurcations, and the second fixing portions of a pair of second conventional column ground terminals are located between the two second bifurcations, and the second fixing portion of the second conventional column ground terminal and one of the second bifurcations form an integrated structure.

4. The universal serial bus type A dual electrical connector stack structure as described in claim 3, wherein the circuit board has a plurality of through holes arranged in a plurality of columns, the second solder joints are inserted into one column of the through holes, the integrated structure corresponds to two adjacent through holes, and the integrated structure is connected to one of the second solder joints, and another of the second branch joints is connected to one of the second solder joints.

5. The universal serial bus type A dual electrical connector stacking structure as described in claim 2, wherein the first terminals further include two first auxiliary terminals, the two first auxiliary terminals being disposed on both sides of the first fixing portions arranged in a row and respectively close to the two first high-frequency terminal pairs; the second terminals further include two second auxiliary terminals, the two second auxiliary terminals being disposed on both sides of the second fixing portions arranged in a row and respectively close to the two second high-frequency terminal pairs.

6. The stacked structure of a type A dual electrical connector using a sequential bus as described in claim 5, wherein the first insulating structure includes a first tongue portion and a first base portion connected to the first tongue portion, the first mating portions of the first terminals are disposed on the first tongue portion, the first fixing portions of the first terminals are coupled to the first base portion, and the first mating portions of the two first auxiliary terminals are located outside the first tongue portion; the second insulating structure includes a second tongue portion and a second base portion connected to the second tongue portion, the second mating portions of the second terminals are disposed on the second tongue portion, the second fixing portions of the second terminals are coupled to the second base portion, and the second mating portions of the two second auxiliary terminals are located outside the second tongue portion.

7. The stacked structure of type A dual electrical connectors using a sequential bus as described in claim 6, wherein both the first base and the second base abut against the circuit board, the length of the first base is greater than the length of the second base, the first base has a receiving recess at its adjoining position with the circuit board, and the second base is received within the receiving recess; the portion of the first metal housing covering the first tongue plate and the portion of the second metal housing covering the second tongue plate are separated from each other by a predetermined distance.

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