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Please Help Identify this IC

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Jack Lions:
I've looked all over the web and through many books trying to find this. Any help will be greatly appreciated. It's roughly 4 mm x 3 mm.

wraper:
HCPL-0630 optocoupler

Jack Lions:
Thank you for the reply. I looked at the data sheet for HCPL-0630 optocoupler, however I can't find any reference for 644. Do you know what that represents?

wraper:
Some date/lot code. Nothing useful other than for parts tracing in production.

Uup:
Its meaning is shown in the datasheet, if you look again.

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