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OPA2170

Phillip Karls
Prodigy 250 points
Other Parts Discussed in Thread: OPA2170, OPA192, OPA130, OPA172, OPA137

I'm observing that the OPA2170 has Input Differential Over-Voltage Protection Diodes. I do not see these mentioned in the datasheet anywhere.

Can someone confirm this?

I need an amp like this one (low noise, low power, wide supply range) that does not have these diodes.

Thanks.

  • 0
    TI__Guru 67601 points

    Philip,

    Yes, you are correct.  OPAx170 as well as OPAx171 and OPAx172 have back-to-back input protection diodes-see below.

    At the end of this year, we plan on introducing 2MHz bandwidth 36V CMOS op amp with no back-to-back input diodes - similar to 10MHz OPA192 currently available.  In the meantime, you may consider 36V supply voltage JFET input OPA130 with no back-to-back input diodes.

  • 0 in reply to Marek Lis
    Prodigy 250 points

    That information would be useful in the datasheet...

    Are there options with lower power than the OPA130?

    Thanks!

  • 0 in reply to Phillip Karls
    TI__Guru 67601 points

    Phillip,

    I agree - that is why our latest OPA172 does include the diagram of the ESD/EOS input protection. 

    For the lower power, please see OPA137 with 1MHz bandwidth and typical IQ of 220uA.  But remember that lower power means a higher input noise.

  • 0 in reply to Marek Lis
    Prodigy 250 points

    Thanks, i'll take a look.