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Muthukrishnan
Associate II
August 29, 2025
Solved

STM32H755xI - OTP support

Hi @Amel NASRI ,

Does STM32H755xI support OTP (One Time Programmable) memory in it's flash like STM32BH7B3x?

Muthukrishnan

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mƎALLEm
mƎALLEmBest answer
ST Technical Moderator
September 1, 2025

Hello,

1- As said by my colleague and unfortunately there is no OTP on STM32H755 and other STM32H75x/H74x devices. And unfortunately there is no solution/workaround for the moment.

2- "In the security section, I have seen "active tamper". How does it work?".

> For this question please open a dedicated thread in "STM32 MCUs Security" forum board.

Thank you

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4 replies

STTwo-32
STTwo-32
ST Technical Moderator
August 29, 2025

Hello @Muthukrishnan and welcome to the ST Community

According to the DS12919, there is not an OTP memory on the STM32H755xl.

Best Regards.

STTwo-32

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    MuthukrishnanAuthor
    Associate II
    August 29, 2025

    Hi @STTwo-32 , thanks for the quick response. We were using STM32H7B3xI where it supports OTP and we were storing some secret information there. Now we are upgrading to STM32H755xl and Im surprised this is missing here.

    Please help me to understand is there any equivalent features like OTP (One time write/Read only) in STM32H755xl? In the security section, I have seen "active tamper". How does it work?

    --Muthukrishnan

    MuthukrishnanAuthor
    Associate II
    September 1, 2025

    Hi @STTwo-32 @Amel NASRI 

     

    Can u please help me here?

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