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Making an STM32 last at 150°C?

StefanH
Associate III

Are there any guides or tips on making an STM32 MCU last in a high temperature (~150°C) environment? Specific voltage or clock speed tweaks?

The MCU would sleep most of the time, but now and then take and store some measurements.

Would certain families be better (for example because of different semiconductor nodes)? We're looking at the G4 and L4 MCUs (G4 for the embedded OPAMPs) but the application would work with pretty much any part number.

Similarly, would certain package types be more temperature resilient?

11 REPLIES 11
Joe WILLIAMS
ST Employee

Dear StefanH,

As an alternate solution, if temperature is your primary concern, ST manufactures automotive grade MCUs. The SP5 has full operation guaranteed from -40 to 165 °C (TJ). Take a look at our SPC5 32-bit Automotive MCUs page to see if one of these automotive grade micros might work in your application. A SPC5 product selector tool is on the adjacent tab:

https://www.st.com/en/automotive-microcontrollers/spc5-32-bit-automotive-mcus/products.html

https://www.st.com/en/automotive-microcontrollers/spc5-32-bit-automotive-mcus.html

Several versions are available through the ST Authorized Distributor's inventory. If you need help locating alternate devices, please submit a request directly to the Online Support Team at:

 
https://my.st.com/ols.

Kind Regards

Joe WILLIAMS

STMicro Support

Garnett.Robert
Senior III

Hi,

Does the chip have to operate continually at 150 C or is that just a transient?

Does the board have electrolytic caps, these degrade very quickly at high temperature? The better normal grade are rated at 12,000 hrs at 105 deg C. Their life reduces by half for every ten degrees above their rating. At 150 C these wouldn't last more than 700 hrs, probably much less. (100 hrs?)  You can get auto grade that are rated at 150 C (Kemet), but I'm not sure of the capacitance and voltages available.

Is it possible to insulate the board and cool it with air? You can get lightweight ceramic insulation material that might do the job.

 

Regards

Rob