4 x 2:1 multiplexer in 16-SSOP
The Texas Instruments CY74FCT2257CTQC is a 4 x 2:1 multiplexer from the 74FCT series, routing one of two data sources per channel to the output. Housed in a 16-SSOP package (0.154-inch body width, 3.90mm), it mounts on the board surface — the 0.025-inch pitch demands a standard fine-pitch soldering profile, nothing exotic for a rework station.
Active production and supply status
RoHS non-compliant per the manufacturer's classification — verify your assembly's exemption status before committing to a lead-free reflow profile.
Temperature grade and deployment context
It handles factory-floor enclosures, outdoor telecom cabinets, and engine-bay-adjacent electronics where the board sees 70°C steady-state with 85°C spikes. The single-supply architecture (4.75V-5.25V) means it runs straight off a 5V rail without a secondary regulator — a clean fit for legacy TTL-logic buses or 5V-tolerant CMOS interfaces.