DP83848YB GNDPAD connection

Alexander Matantsev

Prodigy 30 points

Other Parts Discussed in Thread: DP83848C, DP83848YB, DP83848I

Is it necessary to solder GNDPAD to PCB for normal IC operation?

Or is GNDPAD intented only for extension of temperature range?

Thanks.

over 10 years ago

0 Ross Pimentel over 10 years ago

TI__Mastermind 23675 points

Hi Alexander,

Yes, it is necessary to solder the GNDPAD to the PCB for proper operation.

Regards,

Ross

0 Alexander Matantsev over 10 years ago in reply to Ross Pimentel

Prodigy 30 points

TI offers DP83848C which doesn't have this pad. So I assume -YB version has it for thermal dissipation purposes only. Am I right?

Does GNDPAD have any connection to analog or digital ground inside the chip?

DP83848YB datasheet states that I should solder this pad if I want to get +125 °C temperature range. But what if temperature will never rise above +70 °C? Would DP83848YB with unsoldered GNDPAD be equivalent to DP83848C?

Thanks.

0 Ross Pimentel over 10 years ago in reply to Alexander Matantsev

TI__Mastermind 23675 points

Hi Alexander,

You are correct that the GNDPAD is just for thermal purposes. We recommend that the user solder the pad for maximum performance. I am not sure why you would use the YB unless you wanted temp range above 85C. If you are worried about soldering the GNDPAD but want similar specs to the YB, our DP83848I is another alternative.

Regards,

Ross

0 Alexander Matantsev over 9 years ago in reply to Ross Pimentel

Prodigy 30 points

Sorry, just wanted to clarify. What temperature range should I expect from -YB version if it's GNDPAD is not soldered for technological reasons?

Regards,
Alex.

0 Christian Willschek90 over 9 years ago in reply to Ross Pimentel

TI__Prodigy 715 points

Hi Ross,

is the GNDPAD floating or internally connected to GND? Will it be damaged if I use my 3.3V plane of my PCB for thermal distribution?

Regards
Christian

0 Patrick OFarrell over 9 years ago in reply to Christian Willschek90

TI__Mastermind 31600 points

Christian,

The die is not electrically isolated from the GNDPAD. Therefore, the GNDPAD cannot be connected to a supply. It must be connected to GND or left unconnected.

Patrick

Interface

Interface forum

DP83848YB GNDPAD connection