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Please help me identify this part

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tecmec

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Could someone please help me determine what this part is?

U5 in the images below
Z84B is what it says on the top (90% sure using magnifying glass)

**broken link removed**

**broken link removed**

Some background:

The two traces that go to the header connect to the header as you would expect. The header itself connects to an ATX motherboard as a power switch. In other words, the header essentially acts as a momentary switch.

Does anyone know what U5 is? I was thinking maybe an optocouple? Google doesn't help
 

Please let me know in detail which pins connect where ( which component to component) Draw the schematic with that component and post it here. Will try to sort it out.
 

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