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STM32H755xI - OTP support

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Muthukrishnan
Associate II

‎2025-08-29 6:41 AM - last edited on ‎2025-08-29 7:01 AM by

Hi @Amel NASRI ,

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

Muthukrishnan

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mƎALLEm
ST Employee
In response to Muthukrishnan

‎2025-09-01 1:27 AM - edited ‎2025-09-01 2:07 AM

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

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.

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STTwo-32
ST Employee

‎2025-08-29 7:12 AM - edited ‎2025-08-29 7:14 AM

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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Muthukrishnan
Associate II
In response to STTwo-32

‎2025-08-29 7:36 AM - last edited on ‎2025-08-29 7:41 AM by

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

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Muthukrishnan
Associate II
In response to Muthukrishnan

‎2025-08-31 11:25 PM

Hi @STTwo-32 @Amel NASRI 

 

Can u please help me here?

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mƎALLEm
ST Employee
In response to Muthukrishnan

‎2025-09-01 1:27 AM - edited ‎2025-09-01 2:07 AM

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

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.
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