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TVS1800: TVS1800

John Smith
Prodigy 120 points
Part Number: TVS1800
Other Parts Discussed in Thread: INA592, , TVS3300

Hi Team,

We need to add some protection to our 36V OPAMP such as INA592. The datasheet for INA592 states maximum is +/-18 or 36V.

While the datasheet for TVS1800 shows it doesn't start to clamp the voltage until 25V.

Should we be using a smaller TVS such as TVS14xx? Thank you so much.

  • 0
    TI__Expert 8476 points

    Hi John,

    I'm assuming you're planning on using the dual supply configuration for this. You should use the TVS1800 if you plan on having voltages up to 18 V on the IN lines. You also need to take into consideration what your common mode voltage will be since this device has a common mode voltage max of 54 V. From there, pick a diode with a Vrwm that does not exceed your excepted max working voltage. In our portfolio, our devices currently go up to 33 V Vrwm (TVS3300).

    It seems that the abs max and recommended operating conditions are they same for this device, which means would need a perfect diode with zero internal resistance, which do not exist. However, the abs max rating for most ICs are the abs max for DC voltages, not transients. Usually the transient voltage can a be a little higher than the DC abs max. The only way to tell for sure is to test it out.  

    Regards,

    Matt Smith