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Board Runs Hot

In one of my circuits the A-Star 32u4 Micro reaches 40°C - is that a problem? I can’t find any documentation for the board but the ATMega chip specs says:

Data retention: 20 years at 85°C/ 100 years at 25°C
Operating temperature: Industrial (-40°C to +85°C)

I’m within the range but does anyone have any practical experience? It’s hot to the touch.


I am not sure how you are measuring the temperature of the board, or what the ambient temperature is in your environment, but the A-Star 32U4 Micro running around 40°C does not immediately seem problematic. Please keep in mind that it is normal for electronics like these to get hot during regular operation (even hot enough to burn you), so if people touching the components is a possibility in your application, I recommend adding physical guards to prevent that.

- Patrick

Hi Patrick - I’m using a non-contact infrared digital thermometer. Glad to hear it does not appear to be problematic. The board will be inside a box (with venting) so no one will be able to touch it.