Reballing method for inverted packaging of semiconductor integrated circuit or discrete device
A technology of integrated circuits and discrete devices, which is applied in the field of bump packaging of semiconductor integrated circuits or discrete devices, which can solve the problems of poor heat dissipation and large parasitic effects, and achieve simple process, small parasitic parameters and low curing temperature Effect
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Example Embodiment
[0015] Example 1
[0016] 1) Bump bottom metallization
[0017] The three-layer metals of titanium, nickel and silver are sputtered or evaporated in sequence on the chip completed by pressure point lithography. The thickness of titanium, nickel and silver is 1800 mm, respectively. , 3600 , 4500 , the composite metal layer is used to connect the wiring metal and solder balls in the chip, and then the composite metal layer outside the pressure point on the chip is etched by photolithography, and the composite metal layer on the pressure point is retained.
[0018] 2) Apply a layer of tin flux to the chip with a thickness of 48 microns.
[0019] 3) Place a solder ball with a diameter of 290 microns on the above-mentioned composite metal layer of the chip coated with tin flux, heat the chip to 220°C, the solder ball is welded to the composite metal on the chip through the flux, and the metal wire inside the chip is welded. The composite metal layer on the pressure point is ...
Example Embodiment
[0020] Example 2
[0021] 1) Bump bottom metallization
[0022] The three-layer metals of titanium, nickel and silver are sputtered or evaporated in sequence on the chip completed by point lithography. The thicknesses of titanium, nickel and silver are 1860 mm, respectively. , 3980 , 5340 . The composite metal layer is used to connect the wiring metal and the solder balls in the chip, and then the composite metal layer outside the pressure point on the chip is etched by photolithography, and the composite metal layer on the pressure point is retained.
[0023] 2) Apply a layer of tin flux to the chip with a thickness of 56 microns.
[0024] 3) Place a tin ball with a diameter of 300 microns on the above-mentioned composite metal layer of the chip coated with tin flux, heat the chip to 240 ° C, and weld the tin ball with the composite metal on the chip through the flux, and the metal wire inside the chip The composite metal layer on the pressure point is bonded t...
Example Embodiment
[0025] Example 3
[0026] 1) Bump bottom metallization
[0027] The three-layer metals of titanium, nickel and silver are sputtered or evaporated in sequence on the chip completed by point lithography. The thicknesses of titanium, nickel and silver are 2200 mm, respectively. , 4400 , 5500 . The composite metal layer is used to connect the wiring metal and the solder balls in the chip, and then the composite metal layer outside the pressure point on the chip is etched by photolithography, and the composite metal layer on the pressure point is retained.
[0028] 2) Apply a layer of tin flux to the chip with a thickness of 50 microns.
[0029] 3) Place a solder ball with a diameter of 295 microns on the above-mentioned composite metal layer of the chip coated with tin flux, heat the chip to 230 ° C, and weld the solder ball to the composite metal on the chip through the flux, and the metal wire inside the chip The composite metal layer on the pressure point is bonded to t...
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