Texas Instruments SN74HCT139D Logic IC Multiplexer Demux Tube Signal Switch

Texas Instruments SN74HCT139D is a high-speed, low-power Schottky diode clamped CMOS device that operates as a dual 2-to-4 line decoder/demultiplexer. This product features a wide operating voltage range of 4.5 V to 5.5 V, making it suitable for interfacing with both TTL and CMOS outputs, while maintaining compatibility with existing voltage systems. The SN74HCT139D provides two independent decoders and is designed to perform the Boolean function Y = (A1, A0) × enable in positive logic, with efficient signal routing and control in digital circuits. Typical applications include memory chip select decoding, data-routing, multiplexer and demultiplexer systems, and other digital signal switching requirements in both automotive and industrial electronics. With a compact design and robust performance, it is well-suited for use in densely populated circuit boards where board space optimisation and low power consumption are critical.

Type	Logic IC - Multiplexer, demux