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Old 3rd Feb 2020, 7:06 pm   #21
G6Tanuki's Avatar
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 8,245
Default Re: Soldering to gold plated terminals

Originally Posted by stuarth View Post
Turned out to be a VLSI chip in a pin grid array package with gold plated pins in a tin plated socket.
We had something very similar in some late-1970s US-made RACAL-MILGO leased-line modems (US-made, because they were used on transatlantic circuits. 600 Baud! Hey! That was fast back then!) - these had a number of at-the-time-VLSI chips in ceramic packages, fitted into chip-sockets (because they needed slightly-different chips depending on which country they were supplied to).

They'd regularly 'go wobbly' and refuse to equalize with their friend-on-another-continent. After much money spent on transatlantic phonecalls and time spent blaming BT, AT&T, Canada's CNCP and such, the fickle finger of fate was pointed at the modems - a bunch of which were sent back to MILGO. Shortly afterwards they sent us a load of replacement modems.


Turns out that the 'national-telco-specific' LSI chips had gold-plated legs and were fitted to PCB-sockets that were not gold-friendly.
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