Category:PCB Assembly Solder Paste

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Solder paste is a material used in the manufacture of printed circuit boards to connect surface mount components to pads on the board. It is also possible to solder through hole pin in paste components by print solder paste in/over the holes.

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Heatsink solder fillet Reply 2017-02-02 22:07:26
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Yair Almanza Armenta

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Opinions. I have a large finned heatsink that we place over a D2pak transistor. This heatsink is designed to heatsink the transistor through the junction of the pad area that the transistor is attached to. The paste pattern we chose was small dots around the outside of the transitor were the heatsink makes contact and a "window pane" of 4 sqaures behind the transitor. Smalls dots were chose to minimize "float/skewing" of the heatsink. Would you expect to see a solder fillet on the heatsink? Would you think it should? Ipc does not address this type of device specifically, but the heatsink maker says minimal 50% solder coverage on the back is required (no fillet).Our inspectors are reluctant to release due to lack of fillet. What do you think?
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Boris Drazic

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I have learned a lot from your article. Quite useful and impressive info.

potluck9

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I like checking your post and hope your update comes soon.

Teo Anca

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Excellent work. I am impressed.

Renan Duarte

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Many thanks. Your idea is very valuable. Will certainly share this post with my pals.
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