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October 2013

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Subject:
Re: HASL question
From:
Geert Willems <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Geert Willems <[log in to unmask]>
Date:
Wed, 2 Oct 2013 06:34:08 -0500
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A too strong blow-off of of the solder to get a flat finish by (one of) the HASL air knives will lead to insufficient solder coverage of the pads leading to unsolderable oxidized intermetallics after relatively short storage times. Since there is an airknive for each side, you may have an issue on only one side of the PCB which is rather unlikely for chemically deposited finishes like ImSn.

Geert Willems
Imec
Center for Electronics Design & Manufactiring
Belgium
www.edmp.be

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