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OPA817: 跟818一样的封装,为什么两者的热阻不一样呢?

Part Number: OPA817
Other Parts Discussed in Thread: OPA818,

尊敬的TI工程师您好:

我用了opa818,但是有一个通道的Cf需要变大,需要换成opa817才能稳定,否则震荡。

但是我在对比两个运放的参数时候,有一个疑问,两颗运放明明是一样的封装,可以pintopin兼容,为啥热阻不一样呢!(我也买来了实物)

非常感谢!