LM117HVQML-SP: NAC0016A pkg body: electrical/thermal connection

Erik Laurila

Part Number: LM117HVQML-SP

Tool/software:

We are using the 16 CFP (NAC) package for the LM117HVNAC/EM. I plan to open the solder mask under the body to provide a path for thermal relief.

Is this part designed to have the bottom side of the body soldered directly to a ground plane? In this case, both an electrical and thermal connection would be made.

Or it is better to put thermal paste (electrical insulator) under the body to provide thermal relief? This would provide a thermal connection only but insulate the case.

I plan to open the solder mask under the body to provide a path for thermal relief.

4 months ago

0 Elizabeth Won 4 months ago

TI__Intellectual 855 points

Hi Erik,

I'll need some time to double check internally. And can get back to you by the EOD Monday.

Thanks,

Elizabeth

0 Elizabeth Won 4 months ago

TI__Intellectual 855 points

Hi Erik,

It does not matter whether the bottom of the device is connected electrically or not. However, it may be a best practice to solder the pads to ground due to structural concern.
This will also be the best practice for dissipating heat as well.

Thanks,

Elizabeth

0 Erik Laurila 4 months ago in reply to Elizabeth Won

Prodigy 50 points

Is the CASE of this part electrically floating?

0 Elizabeth Won 4 months ago in reply to Erik Laurila

TI__Intellectual 855 points

Hi Erik,

Yes, the case is.
i.e. The non-functional pins/pads can be grounded or connected to the board a different way without affecting the functionality of the device:

Thanks,

Elizabeth

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LM117HVQML-SP: NAC0016A pkg body: electrical/thermal connection