Process for making non-void high-reliability convex points in wafer by vacuum brazing
A vacuum and wafer technology, applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems that the reliability needs to be further improved
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[0010] After cleaning, the assessment measurement is carried out, and the results are as follows:
[0011] A. Shear strength test
[0012] The solder balls on the surface of the chip were subjected to a shear force test, and a total of 50 points were tested. The test values are shown in Table 1.
[0013] Table 1 Shear strength test data table
[0014]
[0015] The shear force value is between 244.90g and 332.10g, with an average value of 275g, which is far greater than the national military standard and meets the use requirements.
[0016] B. Contact resistance test
[0017] To measure the contact resistance between the missing bumps and the pads, select 5 chips at different positions on a 2-inch silicon wafer, with 7 bumps on each chip, and a total of 35 sets of data. The measurement data are shown in Table 2.
[0018] Table 2 Missing bump and pad contact resistance test data table
[0019]
[0020]
[0021] It can be seen from the data in the table that the...
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