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TL431: TL431 dynamic impedance spec

Mia Ma
Intellectual 2515 points
Part Number: TL431

Hi team,

Here is a confusing item that need your help about part TL431BCLP.

We are using TL431BCLP and testing it's dynamic impedance spec |Zka|.In the before test history we have it's always a positive result of ΔVka/ΔIka. But the most recently batch of this part we bought it's result is negative, the Ika change direction is different from Vka, but the absolute value is still in the range.

if it is a normal result? anything different if the vlaue is negative when I calculate the offset the |Zka| bring?

Thanks

Best regards

Mia Ma