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TPS7A25: Thermal parameters - JA & JC

PRAHLAD Supeda

Expert 5325 points

Part Number: TPS7A25

Normally thermal resistance JA is higher than JC. In TPS7A25, JA is 73 while JC is 90. Any specific reason for this behavior ? Also, could you please help to confirm same ?

over 4 years ago

0 JCHK over 4 years ago

TI__Mastermind 44770 points

Hi Prahlad,

We show two JC numbers as shown below:

RTJC(TOP) is from the die to the top of the package through the mold-compound. RTJC(BOT) is from the die to the packages power pad. Here is an illustraion of the different parameters:

This is showing how the paths for heat to escape the package relate to RTJA.

The fundamental reason for the higher number is we have a smaller die, which means a smaller surface area to spread the heat.

I hope this helps to answer your question.

0 PRAHLAD Supeda over 4 years ago in reply to JCHK

TI__Expert 5325 points

Thanks for clarifying

0 JCHK over 4 years ago in reply to PRAHLAD Supeda

TI__Mastermind 44770 points

HI Prahlad,

You are welcome!