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Confirm pin 1 on STM32L433

freeflyer
Senior

‎2025-08-13 1:56 AM

 

  • I have had a board assembled and want to check they have fitted the STM32 in the correct orientation. 

 

Pin 1 on the PCB is shown by the white triangle.

 

IMG_3498.jpeg

But it’s not clear from the package where pin one is because there are two circles in opposite corners in the photo. 

The datasheet only shows one circle to identify pin 1…

IMG_3497.png

 

 

 

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STTwo-32
ST Employee

‎2025-08-13 2:13 AM

Hello @freeflyer 

According to the chapter 4.4 of the TN1433, the pins 1 is correct:

STTwo32_0-1755076340008.png

You can check this by yourself on this document for all MCUs packages.

 

Best Regards.

STTwo-32

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