LM317A: Could you tell me about thermal design of LM317?

Part Number: LM317A

Hi team.

I have a question about LM317.

Could you tell me about it?


In the datasheet p5 "7.4 Thermal Information" there is 23.3 (NDE: TO - 220 PKG) as "RθJA (Junction - to - ambient thermal resistance)".

What is the value of 23.3 specified in what mounting condition?

I think that this package called TO - 220 can be implemented as below.

· Attaching to the fin

· Direct mounting on board

By checking what kind of method is prescribed by your company,

We are considering whether customers can use it from the viewpoint of thermal characteristics.

Best regards,

Masumi Sekiguchi

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