Help Identifying Chips

Part #'s are often prefixed with a few characters indicating the maker name and type of part. Sometimes multiple manufacturers will use the same part name or will omit the alpha-portion of the prefix, but they can generally still be distinguished by a company logo or by the format of the datecode.

Common Prefixes, Manufacturers, and Chip Types
AM27		EPROMs
MB74		Discrete parts
MB83		Mask ROMs
MB84		SRAMs
MBM27		EPROMs
GD74		Discrete parts
GM76		SRAMs
CD74		Discrete parts
HD74		Discrete parts
HM62		SRAMs
HN27, HN48		EPROMs
HN61, HN62		Mask ROMs
HY61, HY62		SRAMs
D27, P27		EPROMs
MX23		Mask ROMs
RO9		Mask ROMs
M5L27, M5M27		EPROMs
M5M23		Mask ROMs
M5M51		SRAMs
M74		Discrete parts
MS62		SRAMs
MC74, SN74		Discrete parts
MCM60		SRAMs
DM74		Discrete parts
NM27		EPROMs
D23, UPD23		Mask ROMs
D27		EPROMs
D43		SRAMs
D74		Discrete parts
M27		EPROMs
M38		Mask ROMs
M51		SRAMs
M74		Discrete parts
MN23		Mask ROMs
MN44		SRAMs
MN74		Discrete parts
FCB61		SRAMs
PC74		Discrete parts
RP23, RP2D, RP53		Mask ROMs
BR62, XLJ62		SRAMs
KM23		Mask ROMs
KM62		SRAMs
KS74		Discrete parts
LC35, LC36		SRAMs
LC74		Discrete parts
SRM20		SRAMs
SP74		Discrete parts
LH23, LH53		Mask ROMs
LH51, LH52		SRAMs
LR74		Discrete parts
LH57		EPROMs
LROG		Chip-on-Board PCBs
CXK38		Mask ROMs
CXK58		SRAMs
M27		EPROMs
T74		Discrete parts
SN74		Discrete parts
TMS27		EPROMs
TC53, TMM23		Mask ROMs
TC55, TMM20		SRAMs
TC57, TMM24		EPROMs
TC74		Discrete parts
V63, V65		SRAMs
WR25		Mask ROM
X24		EEPROMs
YM22, YM23		Mask ROMs

Common Mask ROMs

Here is a small selection of commonly used mask ROMs. In the pictures, the colored rectangles show the different meanings: Part #, Part Suffix, ROM Label, DateCode

RP23256E	LH231G
MN231001	TC531003CP
UPD23C2013C	M38128B
[IM231003]	[UPD23C1010]
[UPD23C1013]	[MB831002]
831000-15	HN62302BP