> This bending of chip legs needs to be done with much care. I worked with a
> guy who got involved in doing this on a research project because of a
> mistake in laying out the PCB, and they found the chip concerned would
fail
> every few weeks. They then went through some loops to install an IC socket
> so that they no longer needed to bend the chip legs, and the failures
> stopped. It seemed that bending the leads so the chip could be inserted
> upside down damaged the hermetic seal at the plastic/lead frame point and
> let moisture into the chip resulting in short term failure.
>
> Incidentally Russell, this happened at Auckland University.


It figures ! :-)

I was going to mention the dangers of bending near the deal but decided it
wasn't worth while as nobody would be liable to actually do it. I was wrong
:-)
I've also seen RAM ICs stacked 8 high and 8 long in a great wall of china
stack with the single data leads bent out sideways to flying leads. 64 x
2101 I think. Long ago. Maybe 2102's. 64 kB total?  A vast memory size for
the day.


    Russell McMahon

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads