ST-LINK power questions

giwonKIM · ‎2025-12-09

Hello

I am connecting the ST-LINK and downloading the firmware to the programmer.

I have a question. Can I do power from ST-LINK and download firmware instead of supplying external power to the MCU? Currently, I use external power, but I wonder if there is such a way.

Thank you.

AScha.3 · ‎2025-12-09

Hi,

A genuine st-link has no power output, so no power for the target.

Only if you solder/wire a connection to get power yourself, let say with a st-link V3 mods, you can have some 100mA or so from the st-link. See the manual for st-link V3mods.

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Andrew Neil · ‎2025-12-10

You didn't say what ST-Link you're using - there are several versions:

https://www.st.com/en/development-tools/hardware-debugger-and-programmer-tools-for-stm32/products.html

TN1235: Overview of ST-LINK derivatives

Those are the real ones; there are also fakes/clones - see: How to recognize a genuine ST-LINK/V2 versus a cloned one.

The User Manual for the particular model you have will describe its capabilities...

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

Aziz BRIGUI · ‎2026-01-13

Hi @giwonKIM,

Along with comments said by @Andrew Neil and @AScha.3, there's also the STLINK-V3PWR that can power the STM32.

If any of these answers address your question, please mark the comment as accepted solution.

Thanks in advance,

Aziz

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