Ordered MCUs have shorted pins

Did you purchase from reputable sources? Are you sure no misshandling from your side caused the damage?

Hi Uwe,

Yes, I purchased these from Digikey. I'm also not sure how mishandling would cause all of the IC's that we ordered to have this exact same damage.

Posted this to see if anyone else purchasing these parts had the same issue...

How did you check the short? Have you measured with the meter leads both ways round? There may be protection diodes in the chip. Can't remember if it is STM32 or PIC32 but I've seen a chip powered and working with voltage only on I/O pins and VCC completely disconnected

If they look different, perhaps some pictures? Double check orientation

If you got them from DigiKey perhaps work with them.

As Peter notes this could be ESD protection diodes providing a conduction path to supplies. Many chips can back-power via IO pins, where the grounds are common, and the IO pin(s) drives the VCC rail.

Are these bare chips or already mounted on some board?

JW

As others said, post pictures.

As others asked: how exactly are you measuring them, and what are exactly the findings?

As you've said you've already have them populated, what were the findings when using them?

And, as others said, you may want to discuss this with digikey.

JW

PS. To avoid any confusion: this is a primarily user-driven forum, with only casual ST presence. If you want to take your issue to ST, or want ST to comment, you have to contact ST directly, through FAE or web support form.