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OPA1612: Quiescent current

Signal
Prodigy 20 points

Part Number: OPA1612

Tool/software:

We have an OPA1612AIDRGR Op-Amp that has failed in a circuit, drawing too much current.

I tried to remove another IC from a working circuit using hot air ~400°C to replace the failed one.

Both are drawing around 40mA (12V supply) with nothing connected to the other pins.

Looking at the datasheet, the maximum quiescent current should be no more than 10mA.

I assume the high heat has likely caused damage and resulted in the high current consumption on the part removed to replace the faulty one?

I am yet unsure what caused damage to the original faulty part in-circuit?

  • 0
    TI__Guru* 75311 points

    According to Absolute Maximum Ratings table the maximum junction temperature of OPA1612 is 150C.  Heating it up to 400C will not only damage but virtually evaporate the part. 

  • 0 in reply to Marek Lis
    Prodigy 20 points

    Thanks for your reply Marek. 150°C seems quite low for a maximum junction temperature given that most lead-free solder melts at >200°C! What is the recommended reflow profile for soldering and have you any tips for safe removal?

  • 0 in reply to Signal
    TI__Guru* 75311 points

    A junction temperature refers to a continuous exposure to 150 deg C while solder reflow typically lasts only 5-10 seconds at 275 C. Thus, no danger of damaging the part during proper solder reflow BUT manual unsoldering that may either expose the part to temperature above 300 deg C, or lasts longer than 10 seconds, may in fact destroy the part.