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# LM2904B-Q1: What is the negative output rail voltage of LM2904B-Q1 when temperature is at -30℃?

Part Number: LM2904B-Q1

Or what 's the relationship between temperature and positive /negative rail voltage?

• Hello Josh,

When it comes to the effects of temperature on the power rails, there's a plot that shows how the quiescent current on the power rails changes over temperature

From this plot, the higher the supply voltage, the higher the quiescent current and it looks like at -30C you can expect a quiescent current of 240+uA.

The relationship between the power rails and temperature comes down to how much power dissipation(P=IV) can increase the junction temperature beyond its limit. You would want to avoid this situation because the behavior of the op-amp is not specified.  There is more info on the relationship between power and temperature here: https://www.ti.com/video/4082866348001