Re: Chip Identification

From: Andrew Holme (andrew_at_nospam.com)
Date: 02/18/05 

Date: Fri, 18 Feb 2005 18:34:29 -0000

Chris W wrote:
> I'm going through all these chips I got with a brad board on ebay,
> trying to find out what they all are. Instead of just listing the
> part numbers of the ones I can find, let me as some general questions
> about the numbering conventions and then maybe I can find them
> myself. I have been looking the numbers up on digchip.com. Most of
> them are of the format SN74LS... Can someone tell me what the SN and
> the LS indicate? Then some don't have the LS.... so far I have found
> all of the ones that start like that But there are some that start
> MH74, M74, or DV74, and I can't find those numbers. Then there are
> some that are simply 7475, are those the same thing as a SN7475?
> Some have a suffix of P or PC and I can't find any of the SN74LS....
> numbers that have a P or PC suffix on digchip.com. I will list 2
> part numbers that I can't find and are very strange. MHB2114,
> UYC7483, and uPB74LS11C. On that last one the u is the Greek letter
> used as the micro prefix.

Those are 74 series TTL logic (except for 2114 which is a 1024 x 4bit static
RAM).
LS indicates Low power Schottky.
The prefixes indicate manufacturer.
The suffixes indicate package.

Try searching for the chip numbers on Google. You'll find datasheets. Try
searching with .pdf on the end of the chip number.

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