Part number

Can anyone help identify this part? Thought I might have had the right number a few times but none are in this case. It has 3003 G4 on it. U19/21

Thanks as always!
 

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its a gate drive the ic in question is "ZXGD3003E6". it is becoming common on newer amps. Instead of using drive transistor in the power supply they are using this IC. I have this in the new DD amps as well.
 
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