TUSB1002A: VQFN Package

Shinichi Yokota

Part Number: TUSB1002A

Hello,

In a picture of TUSB1002A's VQFN package (RGE) in the data sheet, what appear to be metal exposed outside are seen. I'd like to confirm if these are really metal or not.

Best regards,
Shinichi Yokota

over 1 year ago

David (ASIC) Liu over 1 year ago

TI__Guru**** 156171 points

Yokota-san

Please let me check and get back to you on this one.

Thanks

David

David (ASIC) Liu over 1 year ago in reply to David (ASIC) Liu

TI__Guru**** 156171 points

Yokota-san

I confirmed it is exposed metal on the package.

Thanks

David

Clemens Ladisch over 1 year ago

Guru 275790 points

The QFN Layout Guidelines application report has an X-ray of the DRB 8 package:

These pieces of exposed metal are part of the lead frame, and are necessary to hold the lead frame in place during manufacturing.

The lead frame, like the thermal pad, usually is connected to GND (or the negative supply for opamps).

Shinichi Yokota over 1 year ago in reply to David (ASIC) Liu

TI__Genius 9715 points

David,

Thanks. Then, I have some additional questions.

Which voltage are these exposed metals connected to internally?
What is the dimension of these exposed metals?

Best regards,
Shinichi Yokota

David (ASIC) Liu over 1 year ago in reply to Shinichi Yokota

TI__Guru**** 156171 points

Yokota-san

I honestly don't know the answer to these two questions. The exposed metal is not connected to anything on the PCB board, so to me it is a don't care situation.

Thanks

David

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TUSB1002A: VQFN Package