[sdiy] Two really dumb questions re Schaeffer and soldering

Fri Aug 9 22:32:44 CEST 2002

Its not the heat that kills its the sudden SHOCK of the
change in heat...

that said I've never used a clip-on heatsink on a modern transistor...
preferring to use a hot iron, real fast... before the heat can transfer up the lead much.

Agreed, royal pain !!!

H^) harry

Subject: Re: [sdiy] Two really dumb questions re Schaeffer and soldering

>> 2) Here's a soldering question. I haven't done any serious DIY since my
>> Paia days many decades ago, but one bit of advice I remember from the P=
>aia
>> manuals was to always heat-sink semiconductors when soldering them. Thi=
>s is
>> a royal pain in the ass, and tremendously impractical. Is it really
>> necessary?
>Since BGA-packaged ICs are "baked" for ~1 day at 180-200=B0C prior to
>soldering to get the humidity out and then get stressed with ~220=B0C dur=
>ing
>the BGA soldering process, I wonder why it'd need a heat sink if you do
>pin-by-pin soldering.
>Rainer
>--=20
>Rainer Buchty, LRR, Technical University of Munich
>Phone: +49 89 289-28401, Fax +49 89 289-28232, Room S3240