Precision Height Stand-Off Block with Inline High Speed Placement MachineAuthors: Steven Perng, Weidong Xie, and Nguyet Anh Nguyen
Company: Cisco Systems, Inc.
Date Published: 10/14/2012 Conference: SMTA International
Based on the analysis, Ni block with Au plating has the most consistent post reflow height. The pad diameter should be larger than the block by 15mil or more. And, with the optimized pad size, stencil aperture does not seem to have strong correlation with post reflow height, if it is within block size +10mil range.
It is planned to run the 2nd Phase with one block size, 11mil height Ni block plated with Au. The target post reflow height is 12mil with ±1mil tolerance.
BGA, stand-off height, stand-off block, tape & reel
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