What is the test temperature range for the electrical characteristics of the DAC?

[SONGTAOSI]

HI,

I have been evaluating the DAC module of STM32H743IIT6 recently. However, the data provided in the data sheet does not specify the temperature conditions under which it was measured. When I conducted the high-temperature test at 125℃, the measured data exceeded the standards given in the data sheet. Could you please inform me of the temperature range within which the DAC values in the data sheet were measured? Looking forward to your reply!

[AScha.3 · Accepted solution]

Hi,

>I conducted the high-temperature test at 125℃

but temp.range is for xxxT6 (you have this - right ?): 

So what deviation you get at 85°   (max. ambient temp.) ?

[SONGTAOSI]

Thank you  for your answer. The data measured at 85℃ meets the requirements of the manual. Also, there are two question that puzzles me.

1.What is the difference between junction temperature and ambient temperature?

2.The STM32H743IIT3 can operate at 125℃. Why can't I find the STM32H743IIT3 product on the official website?

[AScha.3]

1. ambient temperature is temperature around the board ("room temp.") ;

junction temperature is real temp on chip, will always be higher, depending on the power thats dissipated on the chip and the thermal resistance to board and ambient; so type of case (BGA , LQFP ) and board (single...multilayer) will change this / have influence.

read: 

https://www.st.com/resource/en/application_note/an5036-guidelines-for-thermal-management-on-stm32-mcus-and-mpus-stmicroelectronics.pdf

2. STM32H743IIT3 can operate at 125℃.  Every chip can basically work at 125° - but question is lifetime and thermal drift of parameters .

Every chip will have a short life , if overheated; so dont think, you get some "better" chip.

Maybe special selected for this or other parameter and corresponding much more expensive.

If you looking for cpu working (!) at 100° or more ambient, look for the automotive cpus, that are specified for cold/hot ambient. 

And see the limited lifetime, the higher the chip temperature is for some time.

read:

https://www.st.com/resource/en/application_note/an5337-guidelines-for-estimating-stm32h7-mcus-lifetime-stmicroelectronics.pdf

+

on webside...see in e-store , but only view chips in the -3 class: