Identification Number
Logic Chips
AA 999999 B – CC
AA is Prefix:
BL – Beam Lead
RSN – Radiation Hardened
SN – Standard
SNR – High Reliability without group B & C
SNT – High Reliability with group B & C
SNX – Experimental Circuit
999999 is part number (3 to 6 characters, alpha & numeric)
Examples: 7400, 54H01, 74LS05
B is the Package type:
F – Flat package, metal, 1/2 inch tip-to-tip, die is electrically insulted from case
H – Flat package, ceramic, 3/4 inch tip-to-tip, die is electrically insulted from case
J – DIP, ceramic
L – Plug-in package (TO-5 transistor style), metal
N – DIP, plastic
R – Flat package, metal, 3/4 inch tip-to-tip, die is electrically insulted from case
S – Flat package, metal, 1/2 inch tip-to-tip, die is electrically connected to the case
T – Flat package, metal, 3/4 inch tip-to-tip, die is electrically connected to the case
CC is the processing instructions:
Ranges from 00-17, indicates processing options for lead forming, insulation, shipping carrier, and solder-dipped leads
Other Chip Prefixes
TMC – MOS Calculator Chips
TMS – MOS Chips
Date Code
TI Date Code Format: YYWW
These number should be located by themselves with no letters or other numbers immediately adjacent. The numbers are often found on the underside with the country of manufacture.
WW – Week of manufacture. Ranges from 01 to 52.
YY – Year of manufacture. Ranges from 59 to 99.