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Welding column welding method for integrated circuit package

A welding method and integrated circuit technology, applied to circuits, welding equipment, electrical components, etc., can solve problems such as crack expansion in the welding layer, open circuits, and affecting the strength of soldering post welding of packaged products, so as to increase the yield and improve the quality. Effect

Active Publication Date: 2012-11-21
WUXI ZHONGWEI GAOKE ELECTRONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned assembly method often has micro-encapsulated air bubbles on the welding surface, which affects the strength of the soldering column welding of packaged products, and the temperature change is likely to cause cracks in the soldering layer to expand, which will affect the quality of device interconnection and even lead to open circuits.

Method used

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  • Welding column welding method for integrated circuit package
  • Welding column welding method for integrated circuit package
  • Welding column welding method for integrated circuit package

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 , figure 2 As shown, a 1.27mm diameter Sn10Pb90 high temperature solder column 21 is used to assemble

[0029] pitch CCGA560 packaged products. The post welding method of this product includes the following steps:

[0030] (1) Neatly arrange the Sn10Pb90 high-temperature solder columns 21 with a diameter of φ0.89mm in the special mold 1;

[0031] (2) Use a template to print flux 3 on the top of the high-temperature solder column 21, the brand of flux 3: WS-366 of INDIUM, etc.;

[0032] (3) According to the diameter of the high-temperature solder column 21, select the first solder ball 41 with a diameter of φ0.40 mm, and place the first solder ball 41 on the flux 3 on the top of the high-temperature solder column 21 with a ball-dropping template, see image 3 ;

[0033] (4) Put the mold 1 together with the high-temperature solder column 21, the flux 3 and the first solder ball 41 into the reflow furnace (at room temperature). The temperature-time p...

Embodiment 2

[0040] Such as Figure 7 , Figure 8 As shown, a CCGA1144 packaged product with a pitch of 1.00 mm is assembled with an oxygen-free copper metal pillar 22 with a diameter of φ0.50 mm. The post welding method of this product includes the following steps:

[0041] (1) Neatly arrange the oxygen-free copper metal columns 22 with a diameter of φ0.50mm in the special mold 1;

[0042] (2) According to the diameter of the metal pillar 22, select the second solder with a diameter of φ0.40mm and flux

[0043] Ball 42, the second solder ball 42 is placed on the top of metal post 22 with ball setting equipment, see Figure 9 ;

[0044] (3) Put the mold 1 together with the metal pillar 22 and the second solder ball 42 into the heating table. The temperature-time process curve is determined by the second solder ball 42. The second solder ball 42 is melted by the heating table and then cooled to 60 Below ℃, the second solder ball 42 forms a half-moon spherical cap on the top of each met...

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Abstract

The invention relates to a welding column welding method for integrated circuit package. The improvement is that: before a welding column is welded on a substrate, an outward-convex welding flux is formed at the top end of the welding column; and due to the point contact, surface tension of welding flux melting and other factors of the outward-convex welding flux, microbubbles do not exist duringthe fusing of the welding flux and the end surface so as to obtain a high-quality welding column package device without microbubbles on the welding surface. Through the invention, the problem that micro packing bubbles often exist on the welding surface of the welding column is solved without changing the existing welding equipment; the step of performing X ray or ultrasonic check on the device to ensure the welding quality of the conventional welding process is saved; and the welding quality is improved, and the welding yield is increased.

Description

technical field [0001] The invention relates to a soldering process for integrated circuit packaging pins, in particular to a soldering post welding method for integrated circuit packaging, which belongs to the technical field of integrated circuit manufacturing. Background technique [0002] With the increase in the number of I / O terminals of semiconductor integrated circuit devices and the increase in packaging density, the packaging terminals are arranged in area arrays, such as ball grid arrays (BGA) and column grid arrays (CGA), and the pitch is getting more and more The smaller (2.54mm→1.27mm→1.00mm→0.80mm→...). [0003] The process method of using welding pillars to assemble and weld the required column grid array (CGA) package mainly uses printing solder paste such as silk screen or stainless steel plate or distributes solder paste with precision dispensing process, and then puts the welding pillars into the mold or puts them into the mold. After the overall welding...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L21/60B23K1/008
Inventor 丁荣峥杨兵张顺亮
Owner WUXI ZHONGWEI GAOKE ELECTRONICS
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