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# LM4050-N-Q1: Breakdown voltage temperature coefficient clarification

Part Number: LM4050-N-Q1

Hi team,

Could you pls help share below Ir=1mA is spec at what temperature range? Datasheet has list 25C and full temp range spec for Ir=100uA, but didnt specify it clearly for Ir=10mA/1mA

Thank you

Scarlett

• Hi Scarlett,

Given the temperature is not explicitly stated it follows the Ta=Tj=25C (seen in the first image below).

Thanks,
Joshua

• Hi Joshua,

Two additional questions for this topic:

1. I can easily understand the meaning of the temp coefficient at full temp range, and it can be used to calculate the over temp tolerance as the example given in the datasheet. But what's the meaning of the coefficient under TA=TJ=25℃, there is no temperature difference if the ambient temp is 25℃。

2.  How do I calculate the temp coefficient at full temp range? Since there's no clear definition in the datasheet.

Many thanks,

Yuanzhao

• Hi Yuanzhao,

1. I agree with you there is no temperature difference if the ambient temp is 25℃. These specs should have been condensed with 20 ppm/℃ (typical) and 50 ppm/℃ (max) with TA=TJ= TMIN to TMAX.

2. The temperature coefficient at full temp range is 50 ppm/℃ under IR = 100uA. For any other IR the ppm/℃ (max) or full temp range temp coefficient is not provided.

Thanks,
Joshua