LM79: Theta JC

Shota Mago

Expert 6590 points

Part Number: LM79

Hi team,

My customer provided a question in terms of thermal resistance of LM7915CT/NOPB.

LM79xx specifies typ and max θjc on page 4.

Does the θjc mean junction-to-case (bottom) thermal resistance?

Best regards,

Shota Mago

over 4 years ago

0 Jason Song over 4 years ago

TI__Mastermind 23361 points

Hi Shota,

You may find more information from this app note.

http://www.ti.com/lit/an/spra953c/spra953c.pdf

If a package has a thermal pad, the θjc is normally the junction-to-case (bottom) thermal resistance, but this device is a through-hole package, I would consider the θjc to be junction-to-case thermal resistance.

Regards,

Jason Song

Power management

Power management forum

LM79: Theta JC