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opa656 heating problem

yavuz delican
Prodigy 140 points
Other Parts Discussed in Thread: OPA656, OPA653, OPA659, OPA657

We use OPA656NB in our project. But it heats very much (about 75 C) in normal conditions.

What can we do to solve this problem ?

Is OPA656UB obsolete or could it be obsolete in future?

Could OPA656-DIE be used normal PCBs? What is needed for using OPA656-DIE?

Also is there any alternative opamp for OPA656 (with same electrical characteristics)?

  • 0
    TI__Genius 13335 points

    Hello Yavuz,

    There are a lot of reasons for heat issues (heavy loading, poor layout, not enough ground plane, instability, etc). However, without a schematic and layout we can only guess.

    If you upload these things, then we can help you debug your problem. Also, descriptions of intended use and oscilloscope shots are helpful to quickly determine the root cause and possible improvements.

    As far as the OPA656UB is concerned; It is still available to order with no plans to be obsoleted. It would take a very good reason, such as fab closure for example, and require Senior VP approval to do so. This does not happen very often, but if a part does have to be obsoleted for some reason, then we will offer a Life Time Buy and provide a notification. You can review our obsolescence policy here: http://focus.ti.com/quality/docs/gencontent.tsp?contentId=5020&navigationId=11224&templateId=5909

    For mounting the die to a PCB, it can be done if you have the correct footprint to allow the bondwires to be soldered properly. You can find the footprint on the OPA656 product page, http://www.ti.com/product/opa656#cadsymfoot

    Additionally, external shielding or an insulative epoxy should be used to protect the die from over voltage or possible short circuit conditions.

    For similar parts, the OPA656 is part of a family of devices, OPA653, OPA657, and OPA659 which all have similar specifications. We also have a very large selection of amplifiers that can be navigated through the parametric search: http://www.ti.com/paramsearch/docs/parametricsearch.tsp?family=analog&familyId=72&uiTemplateId=NODE_STRY_PGE_T

    The parametric search is really the best way to narrow down the correct amplifier for your application, or if you provide your design conditions here then we can help you narrow it down as well. We need more information though to get started.

    Regards,
    Luke Lapointe
    High Speed Amplifiers