Sector7e Posted June 13, 2017 Share Posted June 13, 2017 While upgrading the RAM in my newly purchased 600XL I accidentally broke off leg 16 on chip 74LS158N K8404 in slot U6. Is this an acceptable replacement: http://www.ebay.com/itm/Signetics-74LS158N-Qty-1-dip16-Ships-in-USA-Tomorrow-/261876487510?hash=item3cf90e1556:g:TnAAAOSwymxVR-al This chip is marked 74LS158N 8142 vs the original 74LS158N 8404. What do the last 4 numbers stand for? Quote Link to comment Share on other sites More sharing options...
Joey Z Posted June 13, 2017 Share Posted June 13, 2017 (edited) the last 4 numbers are just a date code, but also that chip is very expensive. These chips can be had for < $1 if you look in the right place. Try searching some other numbers: First, leave off the N: 74LS158 (of any DIP package) will do Also, there are several other variants which should work fine, 74ALS158, 74F158, 74HCT158, 74ACT158 will all work. Edited June 13, 2017 by Joey Z 2 Quote Link to comment Share on other sites More sharing options...
shoestring Posted June 13, 2017 Share Posted June 13, 2017 You can probably solder on a leg from a donor chip if enough of the broken pin is still exposed. 2 Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted June 13, 2017 Share Posted June 13, 2017 You can probably solder on a leg from a donor chip if enough of the broken pin is still exposed.Or even insert a wire into that hole of the socket and solder the other end to the stub of the broken leg. Ugly but it should work. Quote Link to comment Share on other sites More sharing options...
shoestring Posted June 13, 2017 Share Posted June 13, 2017 (edited) Probably work in a single wipe or machined pin socket. But try getting a thin wire to stay in a dual wipe socket. I hate it when I break a leg but it's relatively easy to solder a donor leg on and it ends up being just as durable...any trick to save money Edited June 13, 2017 by shoestring Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted June 13, 2017 Share Posted June 13, 2017 Probably work in a single wipe or machined pin socket. But try getting a thin wire to stay in a dual wipe socket. It can be done. Solid core wire and a micro-jeweler’s screwdriver will work wonders. That said, the small 74xxx chips on most of my boards seem to be single wipe sockets. Quote Link to comment Share on other sites More sharing options...
Osgeld Posted June 13, 2017 Share Posted June 13, 2017 (edited) where are you located, I have a small stack of 74LS158's laying around I would be glad to mail you one for the price of postage if you are in the US (and yea I paid like 78 cents each + postage on digikey) Edited June 13, 2017 by Osgeld 1 Quote Link to comment Share on other sites More sharing options...
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