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OPA333 Latchup?

Michael Brantley
Intellectual 1535 points

Other Parts Discussed in Thread: OPA333

I am using some OPA333's for buffering.

I am current limiting all inputs by 10k ohms minimum..

The question I have is about applying voltages to the input beyond the rails + or -, an abnormal condition but possible in test.

Are these amps susceptable to latchup if input current is applied before the amp is powered?

  • 0
    TI__Mastermind 29478 points

    Michael,

    Below is a link to a TI Design that discusses this problem.  The key to protecting against overvoltage is to include both a series resistor (as you did) and a transient voltage suppressor.  The transient voltage suppressor will stear the input current to ground if the input is applied before the supply comes up.  Look over the information from the link below and let me know if you have additinal questions.

    http://www.ti.com/lit/pdf/tidu015