ES and E marking on NUCLEO-F303RE

Anuprash · ‎2026-05-25

I am using NUCLEO-F303RE board. I couldn't find ES and E marking in the product information of the datasheet. Does it mean it is not "ES" and "E" marked. can any one please confirm it.

mƎALLEm · ‎2026-05-25

Ok,

As stated in the user manual of the board "ES" and "E" means the product is not yet qualified.

"ES" means Engineering Sample i.e. the product is in a qualification phase.

The datasheet provides information about qualified products. No need to provide that information in the datasheet.

If you have "STM" instead of "ES", that means your product is fully qualified.

Hope that helps.

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mƎALLEm · ‎2026-05-25

Hello @Anuprash and welcome to the ST community,

What do you mean by "ES" in the marking?

Please give an example. What marking do you have on your device? I have a doubt about the answer but I need to be sure ..

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Anuprash · ‎2026-05-25

@mƎALLEm

ES = Engineering Sample
E = Engineering

I have added the snip below, which states ES or E marked cannot be used for qualification activities

mƎALLEm · ‎2026-05-25

Ok,

As stated in the user manual of the board "ES" and "E" means the product is not yet qualified.

"ES" means Engineering Sample i.e. the product is in a qualification phase.

The datasheet provides information about qualified products. No need to provide that information in the datasheet.

If you have "STM" instead of "ES", that means your product is fully qualified.

Hope that helps.

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.