OPA828: OPA828 get damaged

Folnia

Part Number: OPA828

Hi,

I’m working on a TIA design using the OPA828 op-amp.

The TIA input is connected to an axial wire soldered to a metal pin, which I then enclosed with heat-shrink tubing. I used a lighter to shrink the tubing.

After doing this, I found the OPA828 had failed.

Could this have been caused by ESD generated by the lighter? I don’t see any direct ESD path to the metal pin, and the device includes internal ESD protection diodes.

5 months ago

+1 Chris Featherstone 5 months ago

TI__Mastermind 32295 points

Hi Folnia,

This is a great project! It is difficult to pinpoint exactly how the part was damaged, but it likely exceeded the absolute maximum die temperature listed in the datasheet. This can happen easily when heat is uncontrolled. I believe the die temp of the OPA828 is rising due to heat traveling along the wire.

Could you apply the heat shrink before soldering the device to the board? Alternatively, you might consider adding a connector for the input wire so it can be attached after the heat shrink is applied.

Best Regards,
Chris Featherstone

0 Folnia 5 months ago in reply to Chris Featherstone

Prodigy 40 points

So the ESD might not be the cause but the over heat might be. I will note that ,thank you!

0 Chris Featherstone 5 months ago in reply to Folnia

TI__Mastermind 32295 points

Hi Folnia,

No problem! Let us know if we can be of further assistance.

Best Regards,

Chris Featherstone

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OPA828: OPA828 get damaged