I would like to know the difference between Ambient temperature vs operating temperature?
In datasheets they specify operating temperature for IC's.
ex -25°C to +125°C, so does this mean even though the IC's generate heat and ambient temperature is 125°C it would work(with the die temperature being greater than 125°C as IC is generating heat), or is it the die temperature(ambient has to be less than 125°C with th junction temperature of 125°C)?
Electronic – Ambient temperature vs operating temperature
integrated-circuittemperature
Related Solutions
I speculate wildly:
you haven't allowed the device turn-on time to elapse, try adding a delay,
the rise time of the SHUTDOWN pin relative to +Vs is somehow unusual, try controlling +Vs also from a GPIO.
It's the junction temperature \$T_J\$, and yes, they would typically take such a measurement in microseconds before the junction temperature changes.
The upward slope of at high base and emitter currents is due to resistive (non-ideal) behavior that is temperature-sensitive, or due to the reduction in beta at high current (so the base current is higher for a given collector current than if the beta was constant). Note that the beta reduction is temperature-sensitive.
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Best Answer
Ambient temperature is the temperature of the air around the chip.
Operating temperature is the temperature of the chip (die) itself. Since the chip is (typically) generating heat, the operating temperature will be higher than the ambient temperature.
To know the junction temperature you need to know the ambient temperature and the various thermal resistances between the junction and ambient. If you can't get the number for a particular chip, use the numbers for another chip in the same package. Preferably one with a similar die size, but really there's so many fudge factors in estimating the thermal resistance that it doesn't make that much difference.