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Datasheet Replacement Marking Code
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25LC128
MM74C15 (2)MM74C1 (8)MM74C (61)MM74 (539)MM7 (547)
Fairchild Semiconductor

MM74C154N

Decoder/Demultiplexer 1 x 4:16 24-PDIP
Fairchild Semiconductor

MM74C157N

Multiplexer 4 x 2:1 16-PDIP
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