On 11-07-23 10:53 AM, Shane Ellis wrote:
I never really thought of these older ICs having "seals", but it makes
sense, in the sandwich sense. I looked at one of the Fairchild 74141s,
and where the epoxy is sandwiched between the ceramic, sure enough,
there's a hole in there.
(Oh no, another back in the day story)
When I was in High School, the eelctronics teacher Pulled in a few
favours and got the class a tour at what was then "Microsystems
International Limited" ASA "Corkstown Labs", AKA Northern Electric
Semiconductor.
At the time they were doing stuff like making 747 Op amps and the diodes
for the receiver of Northern electric telephones. (the one that cuts the
dial click)
They explained taht they tested the seal on the diodes by by putting a
batch in a chamber with radioactive gas. after a while they puped the
gas away, and any diode that was radioactive was assumed to be leaky and
junked.
The lab later became part of BNR, then Nortel Networks. Last I heard
SGS has some space there as well as Abbot Point of care, to make Istat
medical tests which also require a clean room.
--
Charles MacDonald Stittsville Ontario
cm...@zeusprune.ca Just Beyond the Fringe
http://www.TelecomOttawa.net/~cmacd/
No Microsoft Products were used in sending this e-mail.
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