74ls139 Dual 1-of-4 Decoder Demultiplexer

The 74LS139 IC is a Dual 1-of-4 Decoder/Demultiplexer from the 74LS TTL logic family. Each decoder accepts two binary inputs and provides four mutually exclusive outputs, with an enable input to control operation. Packaged in a DIP-16, it is compact, fast, and compatible with standard TTL logic, making it essential for digital logic design, memory address decoding, and control circuits.

🔹 Applications

• Memory address decoding in microprocessor systems

• Data demultiplexing and digital switching

• Logic function implementation in embedded systems

• Control circuits in robotics and automation

• Signal routing in digital electronics

• Educational and DIY electronics projects

🔹 Precautions

• Supply voltage must remain between 4.75V and 5.25V

• Do not exceed 7V maximum rating

• Ensure proper grounding to minimize noise

• Handle with care to avoid ESD damage

• Avoid overheating during soldering (<260°C for 10s max)

🔹 Technical Specifications

• IC Type: Dual 1-of-4 Decoder / Demultiplexer

• Logic Family: 74LS (Low Power Schottky TTL)

• Package Type: DIP-16

• Number of Decoders: 2 independent

• Inputs per Decoder: 2 binary inputs + 1 enable

• Outputs per Decoder: 4 active-low outputs

• Supply Voltage (Vcc): 4.75V – 5.25V

• Input Current: ±0.1mA max

• Propagation Delay: ~15ns (typical)

• Fan-out: 10 LS-TTL loads

• Power Dissipation: Low (typical LS TTL)

• Operating Temperature Range: 0°C to +70°C

• Pin Count: 16 pins

📹 Tutorial Video

Watch 74LS139 Decoder IC Tutorial

🔹 Related Categories

• IC’s

• Electronics Components

• Tools and Accessories

🔹 Summary

The 74LS139 Dual 1-of-4 Decoder / Demultiplexer IC (DIP-16) is a reliable, high-speed logic IC used in memory address decoding, digital switching, and control logic applications. With dual independent decoders, active-low outputs, and TTL compatibility, it is widely used in embedded systems, robotics, and DIY electronics. A must-have addition to any IC’s collection.