The ONSEMI 74FST3257 is a quad 2:1 multiplexer/demultiplexer bus switch designed for high-performance applications. It's CMOS TTL compatible, operates between 4 and 5.5 Volts, and features extremely low on-resistance (RON) and minimal propagation delay. This switch minimizes noise and ground bounce, ensuring reliable signal routing in digital systems. It is pin-compatible with QS3257, FST3257, and CBT3257, and available in SOIC-16, TSSOP-16, and QFN16 packages. The device is Pb-Free and RoHS Compliant, making it environmentally friendly.