Chip Identification

[Chris W]

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.

--
Chris W
Gift Giving Made Easy
Get the gifts you want &
give the gifts they want
http://thewishzone.com

"They that can give up essential liberty
to obtain a little temporary safety
deserve neither liberty nor safety."
-- Benjamin Franklin, 1759 Historical Review of Pennsylvania

 

[Andrew Holme]

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.

 

[Rich Grise]

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.

Supposedly, "SN" stands for "Silicon Network". M is usually Motorola, or
used to be.

The MHB2114 is a memory chip, I think, and the UYC7483 is probably some
kind of buffer, or it could be just a 7483, and the uPB74LS11C looks like
it's probalby just a 74LS11.

Good Luck!
Rich

 

[Peter Bennett]

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.

The *74* chips are TTL or TTL-ish logic.

The letter prefix indicates the manufacturer - SN is Texas
Instruments. The letter suffix indicates the package - the package
codes vary between makes.

Any letters in the middle (like "LS") indicate some variations in the
internal circuits.

In general, if all the numbers are the same, the parts have the same
logic function.

No middle letters = original fairly power-hungry version. Some parts
in this series are still available, I think.

L = low power, slow (and obsolete)

LS = Low Power Schottky. Low power, but similar speed to the
original.

ALS = Advanced LS

C = C in the middle letters indicates CMOS - very low power. (and just
"C" is fairly slow)

HC, AC = faster CMOS parts

HCT, ACT = CMOS parts with the inputs modified to work reliably with
bipolar TTL.

To find data on these parts, check Texas Instruments, Fairchild or On
Semi's websites, or do a google for <part number> +datasheet.

 

[Lord Garth]

Supposedly, "SN" stands for "Silicon Network". M is usually Motorola, or
used to be.

I recall SN as the Texas Instruments prefix Rich...
http://www.interfacebus.com/logic_prefix.html

Motorolla had their 'Batwing' M

Then there's the suffix:
N for plastic (really epoxy)
J for cerdip (both halves were ceramic surrounding the lead frame)
P for ceramic (hermetically sealed types)

One could really wear off the finger tip skin by handling too many
J parts!

 

[Interfacebus.com]

The SN is a TI device. The 74 stands for commercial temperature range (for
this series) and the LS is Low power - Schottky

This page provides part number prefix to manufacturer, the SN:
http://www.interfacebus.com/logic_prefix.html

This page defines the 'LS' protion
http://www.interfacebus.com/logic_table.html

This page defines temp range
http://www.interfacebus.com/Logic_Prefix_Temp_Range.html

Hope this helps.

 

[Rich Grise]

I recall SN as the Texas Instruments prefix Rich...
http://www.interfacebus.com/logic_prefix.html

Well, yeah, and TI decided on the letters "SN" because they stand for
"Silicon Network." I read that in some TI blurb, so I thought it was like
a given.

Sorry.
Rich

 

[Lord Garth]

Well, yeah, and TI decided on the letters "SN" because they stand for
"Silicon Network." I read that in some TI blurb, so I thought it was like
a given.

Sorry.
Rich

Do you recall TI's multivoltage (probably PMOS) UV EPROM, the TMS 2716?
TMS stood for Too Many Supplies rather than Texas (Instruments) Memory
Systems.