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TMP64-Q1: Reverse Polarity

Ray Vincent Aranzaso
Genius 13515 points
Part Number: TMP64-Q1

Hi,

Good Day.

The customer is interested in using the TMP64-Q1 ±1% 47-kΩ Automotive Grade Linear Thermistor.

It is presented as a unipolar device, due to its silicon design.

His application might however require reversing the polarity to about -300 mV, and he would like to know exactly how the device will perform under reversed 300 mV polarization.

It would be great if he could obtain R(T) curves at -100 / -200 / and -300 mV on the TMP64-Q1.

He guesses the device includes some pn junctions that forbid reverse bias, but it should probably work fine under "mild" reverse conditions, and temperatures around ambient (max. 50°C in my case).

His application is related to kT/q compensation in analog log/exponential circuitry.

Please advise. Thank you very much.

Best Regards,

Ray Vincent

  • 0
    TI__Genius 9675 points

    Hi Ray,

    The TMP64-Q1 is essentially a DNWELL (lightly dope single-crystal silicon) resistor fabricated in a silicon process. The device must be biased correctly in order to function properly.

    If the voltage across the pads is reversed, once the p-n junction starts to conduct the device will no longer appear properly. The TMP64-Q1 would show ~0.6V. For this reason, we cannot provide any RT curves with negative bias applied.

    Jalen