ST25RU3993s with marking "E"

[TNguy.50]

I have ST25RU3993s with marking "E". I see a note in rev.11 datasheet mentioned not to used the "E" or "ES" marking for the production board.

(1)Is the note still true?

(2)If It's released in the field, what kind of failures do I expect?

Thanks,

-Tieng

[Peter BENSCH]

Welcome, @TNguy.50​, to the community!

Correct, this statement is still valid and reads:

Parts marked as “ES�?, “E�? or accompanied by an Engineering Sample notification letter, are not yet qualified and therefore not yet ready to be used in production and any consequences deriving from such usage will not be at ST charge. In no event, ST will be liable for any customer usage of these engineering samples in production. ST Quality has to be contacted prior to any decision to use these Engineering samples to run qualification activity.

ST cannot and will make a statement about possible misbehaviour or failures.

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.

Regards

/Peter

[TNguy.50]

Hi Peter,

As a follow-up, my factory receives a tape of ST25RU3993s which is mixed of rev B and rev E from the Future distributor, see attachment. (1) Is it a normal for a rev E (engineering samples) to mix with a released rev B in the same tape? (2) Also, what are rev [“A", "B", "C", "K", "G", "H" ] are being shipped by ST to our factory's distributors like Future in China?

-Tieng

[TNguy.50]

Hi Peter,

Because of mixing rev B and rev E and the ST25RU9339 under EMI metal cover, Do you have a utility to read out the rev# so we only take an EMI metal cover off for the part with rev. E?

Thanks,

-Tieng

[Tesla DeLorean]

@Peter BENSCH​ are we sure these designators here aren't simply assembly line identification marks. It would be very odd for a tape to contain sample and production parts.

[Peter BENSCH · Accepted solution]

Now the problem becomes a little clearer: it is pretty sure that the marking E is not engineering samples and also not a chip revision.

I don't have the exact details at the moment but hopefully the OLS team do, please open a ticket there and informally ask in the text to add your contact at the distributor so they are informed as well.

Regards

/Peter

[Ulysses HERNIOSUS]

Confirmed here:

https://community.st.com/s/question/0D53W00002AwgxcSAB/st25ru3993-engineering-sample-es

Regards, Ulysses