Help to identify this smd?

Hello =)

Do you recognise this component?

It's being used in this case between the +ve output of a bridge rectifier and ground

I've searched ST & elsewhere and would appreciate your help to identify this & suggest alternatives to replace it.

Many thanks, Craig

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Best answer by Tesla DeLorean

ST FUU DIODE

SMCJ40A-TR FUU

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ST FUU DIODE

SMCJ40A-TR FUU

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