Metal cased diode bridge has worse Rth(JC)?

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cupoftea said:
How is it that the GBJ series diode bridges have Rth(JC) =0.8degC/W but the GBPC series have Rth(JC) of just 1.5degC/W?
How is this the case when GBPC have a metal heatsink tab?
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Differences in internal construction.

But it's the GBJ series that has the metal tab for connection to a heat-sink.
I would expect the diode chips to be directly mounted to the tab, giving a low Rth(JC).
 
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Thanks, though the GBJ doesnt actually have any metal tab...the GBPC does.
 

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