What this dual 4-bit shift register does on your board
The Texas Instruments CD4015BMT is a 4000B-series CMOS dual 4-bit static shift register. It takes serial data in and delivers parallel outputs from each of its two independent 4-bit stages, with push-pull outputs that drive logic loads directly. The wide supply range from 3V to 18V lets it interface with 5V TTL, 12V industrial logic, or 3.3V microcontrollers without level translation, making it a common choice for expanding digital I/O on a motor-drive control board or a PLC input module.
Supply voltage and temperature — the real-world fit
Supply range is 3V to 18V; temperature range is -55°C to 125°C.
Package and mounting — 16-SOIC footprint
Housed in a 16-SOIC (0.154", 3.90mm width) surface-mount package, the CD4015BMT fits a standard SOIC-16 land pattern. The supplier device package is 16-SOIC, so your existing footprint for a 16-pin SOIC shift register works without a layout change.