can the STM32H745BIT6 operate continuously at temperature limit?

MColl.3 · ‎2021-02-04

The "operating temperature range" is specified as +85 deg. C high limit.

Does this really mean the MCU can operate with an ambient temperature of 85 C ?

Only the maximum junction temperature is specific in the data sheet.

waclawek.jan · ‎2021-02-04

You can estimate the internal ("junction") temperature by adding to ambient the temperature gradient given by thermal resistance (given in DS for each package, this assumes the chip is soldered on a decent area of PCB with copper, and there are no other sources of heat on that PCB) * power consumption (supply current * voltage).

There's also an appnote specific to the H7, detailing shortening of expected lifetime with increasing operating temperature [EDIT] https://www.st.com/resource/en/application_note/dm00622045-stm32h7-series-lifetime-estimates-stmicroelectronics.pdf [/edit]

JW

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waclawek.jan · ‎2021-02-04

You can estimate the internal ("junction") temperature by adding to ambient the temperature gradient given by thermal resistance (given in DS for each package, this assumes the chip is soldered on a decent area of PCB with copper, and there are no other sources of heat on that PCB) * power consumption (supply current * voltage).

There's also an appnote specific to the H7, detailing shortening of expected lifetime with increasing operating temperature [EDIT] https://www.st.com/resource/en/application_note/dm00622045-stm32h7-series-lifetime-estimates-stmicroelectronics.pdf [/edit]

JW

Amel NASRI · ‎2021-02-09

Hi @MColl.3 ,

To complete the answer provided by @Community member , please refer to the application note AN5036 (Thermal management guidelines for STM32 applications).

-Amel

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