74HC165D,653

74HC165D,653 is a Nexperia 74HC165 8-bit parallel-in/serial-out shift register in SO-16, in production per Nexperia documentation (the orderable code appears on the Nexperia chemical-content listing with state RFS; distributor listings describe the ,653 code as tape and reel). Logic thresholds follow the HC family pattern across the supply range: input high level is 1.5 V minimum at a 2 V supply, 3.15 V at 4.5 V and 4.2 V at 6 V, with input low level at 0.5 V, 1.35 V and 1.8 V maximum at the same supplies. The selection point is input expansion at minimum pin cost: banks of switches, jumpers and sensor contacts load in parallel and shift out over a few wires, so one device reads eight digital inputs for a microcontroller that is short on GPIO, and devices cascade for larger panels. Selection advice: the D body is SO-16 - match body and packing separately when comparing quotes. The same function also ships as 74HC165PW,118 in the narrower TSSOP-16 body on a 13-inch reel (,118 packing), listed by Nexperia as in supply (state RFS) with the same Rev. 8 electrical characteristics - the PW variant is covered here rather than as a separate page, and its land pattern differs from the SO-16 body, so quote the exact body code the layout needs. Parameters verified against the Nexperia 74HC165 datasheet Rev. 8 (2025-05-09) static characteristics.