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LM2904B: Difference of abs. max rating definition between LM2904B and OPA277

Hung Ching Hsu
Expert 3086 points
Part Number: LM2904B
Other Parts Discussed in Thread: OPA277

Hi Team, 

My customer is considering LM2904B and OPA277 now. 

He has question about abs. max rating of VI(input voltage). 

For OPA277, the abs. max rating is (V-)-0.7～(V+)+0.7V, 

for LM2904B, the abs. max rating is -32V~32V. 

He wants to know what cause the difference of the definition? 

And does it mean LM2904B can still withstand -32V~32V without supplying power to it? 

Thanks.

Regards,

Jo

  • +1
    Guru 316690 points

    For the LM2904B, the abs. max. rating for the input voltage actually is −0.3 V … 40 V.

    The OPA277 has ESD protection diodes between the input pins and both power rails.

    The LM2904B has diodes only between the input pins and V−.

    The absolute maximum ratings apply also when there is no power.

  • +1
    TI__Guru**** 164796 points

    Hello Jo,

    The difference between IN+ and IN- can be 32V with either input being higher than the other.  No input should be more (negative) than -300mV (relative to V-) unless current is limited to a small level, such as 100uA.  The voltage for each input should be between -0.3V to 36V relative to V- pin.