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OPA4171: using internal diode as clamping diode?

Part Number: OPA4171
Other Parts Discussed in Thread: TLV272, LM2902, LM2904, LM2903, OPA377, OPA4172

Team, 

Can the internal OPA4171 diode be used as clamping diode, as long as specified ratings of the device are not exceeded? 

What about other amplifiers: 

TLV272

LM2902

LM2904

LM2903

OPA377

Thanks!

Viktorija

  • Hi Viktorija,

    As long as the current flowing through the internal clamping diodes is less than what is specified in the absolute maximum ratings, the device will not be damaged. However, note 1 under the absolute maximum ratings table states "Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability". Therefore, it is not recommended to repeatedly turn on the internal clamping diodes. If it is expected that the internal clamping diodes will repeatedly turn on we recommend limiting the current through the diode for the OPA4171 to less than 1mA.

    Thank you,

    Tim Claycomb

  • Vikorija,

    Which diode(s) are in question?
    Chose from this list [input , output] to [GND, VCC, other input]
  • The diodes in question are from inputs to GND and VCC
  • Sergio,

    OPA4172 diodes to GND & VCC

    TLV272 diodes to GND & VCC

    LM2902 diodes to GND only

    LM2904 diodes to GND only

    LM2903 diodes to GND only

    OPA377 diodes to GND & VCC

    For LM290X, diode to GND current may cause phase reversal (inversion).

    For current flow magnitude see Tim's response.