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LM341: Thermal test condition for LM341(TO-220)

Part Number: LM341

Hi Team,

Customer is considering using LM341(TO-220) and the thermal JA resistance is 22.6, which is much better than competitor. 

So they want to know the test condition to get this good performance. Any layout reference?

I checked http://www.ti.com/lit/an/spra953c/spra953c.pdf  and  http://www.ti.com/lit/an/snva036b/snva036b.pdf  and no such info.

Looking forward to your reply. Thank you!

Marc