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.

If you feel a post has answered your question, please click "Accept as Solution".

View solution in original post

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.

If you feel a post has answered your question, please click "Accept as Solution".

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

In order 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.