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LM431: REF431 (2.495V) is used as a clamping diode, what is the max. I_KA at 1V and 100°C

Part Number: LM431
Other Parts Discussed in Thread: TL431


I have a circuit challenge.

The voltage should be limited at a high-impedance ADC input without influencing the high-impedance measurement signal.

The problem should be solved with a shunt regulator (REF431).

In the data sheet, the characteristic curves are not very meaningful.

I need the current I_KA at 1V / 100°C, V_KA=V_REF . 

It is known that I_LIM is not reached.

However, the clamping current at V_KA = +1V is still lower than with a normal silicon diode.

Frank Roeder