IWR6843AOP: Solder mask

HS FAE Germany

Part Number: IWR6843AOP

Hello,
the evm used a solder mask below the complete package. This is not documented in the land pattern (page 72) in the datasheet. Is this needed?

Regards, Holger

over 4 years ago

0 Charles Oladimeji over 4 years ago

TI__Mastermind 33805 points

HI,

Are you referring to the "thermal pad" in below the AOP IC?

Regards,

Charles O

0 Charles Oladimeji over 4 years ago in reply to Charles Oladimeji

TI__Mastermind 33805 points

Handling offline

0 HS FAE Germany over 4 years ago in reply to Charles Oladimeji

TI__Mastermind 31370 points

still waiting for feedback

0 CHETHAN KUMAR Y.B. over 4 years ago in reply to HS FAE Germany

TI__Mastermind 25825 points

Holger,

If you are referring to soldermask under the AOP EVM is to provide better heat dissipation under the AOP package, so that PTH could be placed and heat could be transferred to the other layers in the PCB.. and also to the bottom side of the PCB, From which additional provision could be provided for the heat sink on that side of the PCB.

For more details you could refer to the. Below appnote

Thanks and regards,

CHETHAN KUMAR Y.B.

0 Aaron Liao96 over 4 years ago in reply to CHETHAN KUMAR Y.B.

Prodigy 60 points

Hi,

After checking the appnote, we still have a question about the stencil open.

Refer to the EVM's gerber file, it seems to have the stencil open for the thermal pad.

Our question is, do we need soldering in this thermal pad? if yes, If there is any potential risk when soldering contact the die of IWR6843AOP?

Thank You.

Aaron

0 CHETHAN KUMAR Y.B. over 4 years ago in reply to Aaron Liao96

TI__Mastermind 25825 points

Aaron,

This solder mask opening provision is provided for additional heat transfer to the bottom layer.

As of now there is no soldering is planned. In future, If there is additional thermal improvement is desired thermal interface material could be placed between the die and the PCB to transfer heat through this exposed solder mask opening. But this is a just future option on the board not a must have for the mmWave sensor option.

Thanks and regards,

CHETHAN KUMAR Y.B.

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IWR6843AOP: Solder mask