GPIO expansion for 3.3V and 5V buses
The CD74HC165M is an 8-bit parallel-load shift register that converts eight digital inputs into a serial data stream — a standard solution for adding input ports to a microcontroller when the GPIO count falls short. Complementary outputs (Q and Q̅) give the firmware engineer the option to read the serial stream on either polarity, saving an inversion gate in the SPI or bit-bang routine. The -55°C to 125°C operating range covers industrial enclosures, outdoor telecom cabinets, and engine-bay-adjacent electronics without a temperature-grade upcharge.
Package and board-fit for 16-SOIC layout
Housed in a 16-SOIC narrow-body (3.90 mm body width), the CD74HC165M matches the JEDEC MS-012 footprint that is standard across the 74HC logic family. The tube packaging is typical for through-hole assembly or low-volume rework; for high-volume pick-and-place, order the tape-and-reel variant if the BOM quantity exceeds a few hundred units.
Active lifecycle — no LTB pressure
The ROHS3 compliance is current with EU Directive 2015/863, so the part passes restricted-substance audits without an exemption letter.