LM317A: Thermal Shutdown Temperature

Hirotsugu Kobayashi

Mastermind 9540 points

Part Number: LM317A
Other Parts Discussed in Thread: LM317M

Hi, team.

Please tell me the thermal shutdown temperature of LM317A.

Best Regards,

over 5 years ago

0 Jason Song over 5 years ago

TI__Mastermind 23361 points

Hi Hirotsugu-san,

From discussions in other posts, the thermal shutdown temperature of the device is similar to LM317M, which is around 170C.

https://e2e.ti.com/support/power-management/f/196/t/539794?tisearch=e2e-sitesearch&keymatch=lm317a%25252525252520thermal

Regards,
Jason Song

0 Hirotsugu Kobayashi over 5 years ago in reply to Jason Song

Mastermind 9540 points

Thank you Jason.

But I want a clear answer.

Can you check directly with the IC designer?

Best Regards,

0 Jason Song over 5 years ago in reply to Hirotsugu Kobayashi

TI__Mastermind 23361 points

Hi Hirotsugu-san,

Due to the age of the device, when it was released, it was done with a paper schematic which means it's not in the design database and no simulation can be done on this device.

Again the thermal shutdown temperature is not a test parameter, and it could vary from device to device. I would recommend using 170C as a typical and explain to your customers that this temperature is set as protection and there is no test data on this parameter.

Regards,
Jason Song

Power management

Power management forum

LM317A: Thermal Shutdown Temperature