What the 1 x 4:16 configuration buys you
The CD74HC4515M is a 4-to-16 line decoder/demultiplexer from the 74HC family — one active-low enable gate selects the chip, and a 4-bit binary input steers a single data input to one of 16 mutually exclusive outputs. That means a single 24-pin SOIC replaces sixteen individual AND-OR gates or a discrete diode matrix in address decoding, memory bank selection, or I/O expansion.
Package and board-fit realities
Housed in a 24-SOIC wide-body (0.295" body width, 7.50 mm), the CD74HC4515M demands a standard SOIC-24 footprint with 1.27 mm pitch. The wide-body gives better thermal dissipation per pin than the narrow SOIC variant — the 5.2 mA per output on all channels simultaneously stays within the package's thermal budget without forced airflow. Surface-mount assembly on a two-layer board works fine for this part; the 24-SOIC fan-out doesn't require blind vias or microvias. A 0.1 µF decoupling cap within 5 mm of the supply pin keeps switching transients below 200 mV peak-to-peak into a 50 pF load.
Sourcing and compliance posture
It is a standard catalog part, not a custom or short-run device, so supply continuity through authorized and independent channels is stable.