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CD74ACT161: CD74ACT161

Part Number: CD74ACT161
Other Parts Discussed in Thread: CD74HCT161

I was mistakenly sent, by a distributor, an incorrect part.  I ordered the CD74ACT161 component.  The parts found on my assemblies had a part marking of "HCT161M".  What part does this marking belong to and what is the difference between it and the part I ordered?