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LM1117热阻问题

Other Parts Discussed in Thread: LM1117

Hi support

我司使用 LM1117进行5V转3.3V,封装为SOT-223在阅读规格书过程中,有关热阻请教,

Thermal Resistance Junction-to-Case ,PN到管壳热阻为15,Thermal Resistance Junction-to-Ambient,PN结到环境热阻为136,请问,在计算结温时使用哪个热阻参数?