7 Dec
2014
7 Dec
'14
7:32 a.m.
Something like a 74LS373, that's still in production and commonly
available; you can get it from Jameco, Digi-Key, Mouser, etc. I don't think
there's really any difference in quality between manufacturers these
days... if you go to Jameco the manufacturer is often "TBD" anyway, LOL.
I would replace all with "LS" parts, don't bother trying to find an exact
replacement for that 74S part.
Some people really like to put a socket in when they replace an IC. I
suppose people figure if it failed once it could fail again, and of course
you want to limit the amount soldering/desoldering so you don't damage the
board... I think it's really personal preference; I think the MTBF on
whatever IC you've replaced is going to be pretty high... if you do go
ahead and put a socket in there, be sure to check vertical clearance and
also I think it's worth spending the extra pennies for a nice turned-pin
socket... much nicer than the stamped-pin sockets and they'll hold up
better over the long run.
Best,
Sean
On Sun, Dec 7, 2014 at 8:38 AM, Noel Chiappa <jnc at mercury.lcs.mit.edu>
wrote:
PS: When buying replacement chips, since many are NOS,
which manufacturers
should be avoided, and which are good? I recall there was some discussion
on
here a while back about the topic of which vendors seemed to have the most
problems with chips failing, but I can't find it (and a bit of Google
searching couldn't turn up anything on the topic - all my searches turned
up
too much other stuff).
And should I always install the replacements in sockets, or is it OK to
just
go ahead and solder them straight in? (The socket obviously doesn't cost
much, and I'm less likely to damage the chip installing it like that, and
of
course if I get it in and it's U/S, it's easy to swap out from a socket,
but
I'm wondering if the use of a socket has any downside, electrically.)
Again, thanks for any advice (and I won't be surprised if the last starts
the usual debate... :-)
Noel