1-of-16 decoder — what it does and where it fits
The CD74HCT154M is a 74HCT-series 1-of-16 decoder/demultiplexer from Texas Instruments. It takes four binary address inputs and drives one of sixteen active-low outputs low.
Sourcing and lifecycle — active, no LTB pressure
There is no last-time-buy notice or obsolescence risk on this line. The part is ROHS3 compliant, so it passes modern environmental requirements without needing a waiver.
Output drive and what it means for the bus
Each output can source or sink 4 mA (high and low). That is enough to drive a CMOS logic input or a low-power LED indicator directly, but not enough to drive a relay coil or a long backplane trace without a buffer.
Package and board fit
The part comes in a 24-SOIC wide-body package (0.295-inch body width, 7.50 mm). That is a standard footprint shared by many 24-pin SOIC logic parts. The surface-mount package suits automated assembly lines. No special handling required beyond standard SMD reflow profiles.