Tool/software:
Hello! We found a chip from National Semiconductor in our warehouse. Could you help us find out its production date?
We would also like to clarify whether its part number LM2937ESX-2.5 is correct? Does the suffix "X" indicate the type of packaging?
Hi Gregory,
Photo of the chip below. Could you please help me decipher the datacode?
Best Regards,
Jack Barret
Hi Jack,
Thank you for the email. Copying my response here as well, feel free to respond via either.
The device appears to be from 2005, manufactured somewhere between late July and early September of that year. This would be prior to TI’s acquisition of National Semiconductor (from whom we acquired the part). The parts I found made with the same “LM2937ES-2.5” P/N in our systems post-acquisition (circa ~2011) use a different first line marking convention.
National Semiconductor used the first digit for the date’s least significant digit, and the second to index a 6 week periods of time, more info below: Device Marking Conventions | National Semiconductor.
However, the chip with that marking could have been shipped under part numbers:
There is no good way to determine that on this legacy device from the information I have, but they should all be electrically identical.
May I ask where the LM2937ESX-2.5 part number came from? And what/how critical is the concern on manufacturing date for this part?
Best,
Gregory Thompson