[STPM3x] Production date ?

[carton]

Hi,

I have a STPM33 on some of my PCB and I have issue with some of them when it gets too hot.

The actual datasheet tells us that the operating temperature range is -40C to +105C but I've found an old one of October 2013, another of October 2014, another one of October 2015 and another one of January 2018 which all indicate an operating temperature of -40C up to +85C.

How to know when my STPM33 were produced ? I've been producing these PCB since 3 years and with newer ones I have far less measurement errors as the temperature gets hot. It could be great if I can find some information about the production date.

I hope it's possible

Thank you

Best regards

[carton]

I solved the issue. It appears that the more the STPM33 gets hot, the more it's sensible to SPI timings. I adapted my device driver with better timings for read/write operations on registers and I have no more issues on old and newer boards with these STPM33.

But, anyway, I'm still interested if it exists some way to determine when my STPM33 was produced.

[Peter BENSCH · Accepted solution]

I have only just seen your question, but maybe an answer will still help you.

The date code is coded in the third line of the marking on the far right in the form YWW, i.e. the last digit of the production year and two digits for the calendar week.

Since the STPM3x has only been around since 2014, the one digit is still unique now (2023).

If the problem is solved, please mark this thread as answered by selecting Select as best, as also explained here. This will help other users find that answer faster.

Good luck!

/Peter

[carton]

Thanks for your answer. We're still actively using STPM33 so yes, it's useful to know.