74HC251

The 74HC251 is a high-speed CMOS 8-to-1 multiplexer with three-state outputs, designed for efficient digital switching and flexible data routing in complex circuits. It integrates eight data inputs, select inputs, and an enable pin to provide controlled signal selection and bus sharing capability. Operating voltage: 2V to 6V for broad logic-family compatibility and low power operation. Propagation delay: approximately 12 ns to support fast signal processing and high-frequency operation. 3-state outputs: allow multiple devices to share the output line without interference. High noise immunity: greater than 28% of VDD for reliable performance in noisy environments. Low quiescent current: below 80 µA to help preserve energy in battery-powered systems. Built with advanced CMOS technology, the 74HC251 balances rapid switching with minimal power draw. Its optimized architecture reduces signal distortion and cross-talk, improving overall circuit integrity in demanding digital applications. Compared to older TTL multiplexers, the 74HC251 offers superior speed and output control, and its 3-state outputs enhance versatility in bus-oriented designs where shared lines and coordinated output enabling are required. This multiplexer is suitable for embedded system designers and engineers seeking a compact, low-power component for signal selection, bus interfacing, and high-speed digital switching tasks.