I went ahead and looked at IC Master, and got no hits. Thus 1624hv is probably the part number of the product manufacturer. If I am buying 100,000 ICs (I wish), I would get the IC manufacturer to label them with my part number rather than the generic part number. Thus you might need to go to the manufacturer of the product the part is in to get a generic cross reference. If it is a custom part like a gate array, the product manufacturer might be the ONLY place you can get the part.
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