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OPA814: Maximum continuous output current

Ali Mehmed
Prodigy 40 points
Part Number: OPA814
Other Parts Discussed in Thread: OPA817

The datasheet for the OPA814 op-amp indicates that the "linear output drive" [current] is typically 70mA into a 100-ohm load (for VOUT =+/-1V) and the "short-circuit" current is 90mA. However, in the Absolute Maximum Ratings table, it indicates that the "continuous output current" is only +/-30mA indefinitely, which seems rather contradictory. I would have expected that the device can source 90mA into a short-circuit indefinitely, but the +/-30mA figures would seem to contradict this.

Can someone please clarify for how long the device can:

* Source 90mA into a short-circuit.

* 70mA into a 100-ohm load when VOUT = +/-1V

The datasheet for the OPA817 is similarly confusing.

  • 0
    TI__Expert 6050 points

    Hi Ali,

    The Absolute Maximum Ratings for the continuous output current of +/-30mA is a long-term continuous current limit due to electromigration. Devices can run at this limit up to 100,000 continuous turn-on hours. Running at a higher continuous output current will shorten the amount of time the device can run before electromigration becomes an issue, but you should still be able to run a considerable number of hours.

    I hope this clears up the confusion. Please let me know if you have any other questions.

    Thanks,

    Nick