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RAltm
Senior
April 15, 2026
Question

STM32, DAC output buffer, maximum safe output current

  • April 15, 2026
  • 1 reply
  • 185 views

Hello,

I want to know the DAC output buffer maximum safe output current before damaging the output buffer. I know that it's not possible to get the output swing mentioned in the datasheet under this condition.
The datasheet maximum ratings doesn't state it for the DACs, and from the normal ratings only the current to keep the maximum output voltage around VREF+ can be calculated. So, either I wasn't able to locate the information in the datasheet (which is hopefully the case) or it isn't mentioned there at all.

I'm using a STM32U083 device, datasheet https://www.st.com/resource/en/datasheet/stm32u083kc.pdf

Regards

1 reply

MasterT
Lead II
April 15, 2026

Page 94-95 table.76 see "Resistive load", min. value R defines DAC's max. output current.

RAltm
RAltmAuthor
Senior
April 16, 2026

Hello MasterT,

that's the value for normal operation. As I wrote, I want to know the value before damaging the output buffer.

Regards

Ozone
Principal
April 16, 2026

If you don't find this value in the DAC specific section or under "Absolute maximum ratings", you can safely assume it is not individually determined for DAC outs.

Ozone_0-1776328448360.png

Perhaps ST staff can provide you more details.