Texas Instruments

SN74ALS139N  

Encoders, Decoders, Multiplexers & Demultiplexers

SN74ALS139N Description

The SN74ALS139N from Texas Instruments is a high-performance dual 2-to-4 line decoder/demultiplexer integrated circuit (IC) belonging to the 74ALS series. Designed for through-hole mounting (16-DIP package), it operates within a 4.5V to 5.5V single-supply range, making it ideal for 5V TTL-compatible systems. With two independent decoder circuits (1 x 2:4 each), it efficiently decodes binary inputs into one-of-four active-low outputs, enabling precise signal routing in digital systems. The device supports output currents of 400µA (high) and 8mA (low), ensuring robust drive capability for interfacing with other logic families. Its 0°C to 70°C operating temperature range and ROHS3 compliance make it suitable for industrial and commercial applications.

SN74ALS139N Features

• Dual Decoder/Demultiplexer: Two independent 2-to-4 decoders in a single package, reducing board space and cost.
• Wide Voltage Range: Operates at 4.5V–5.5V, compatible with standard TTL logic levels.
• High Output Drive: 8mA sink current ensures reliable signal transmission in noisy environments.
• Low Power Consumption: ALS technology offers improved speed-power efficiency over standard TTL.
• Robust Packaging: 16-pin DIP for easy prototyping and through-hole assembly.
• REACH & ROHS3 Compliant: Environmentally friendly and suitable for global markets.
• Non-MSIL (Moisture Insensitive): No moisture sensitivity concerns, simplifying storage and handling.

SN74ALS139N Applications

• Address Decoding: Ideal for memory or peripheral selection in microprocessor/microcontroller systems.
• Data Routing: Used in multiplexed bus systems to direct signals to specific subsystems.
• Industrial Control Systems: Reliable performance in automation and PLCs due to wide temperature tolerance.
• Test Equipment: Precision signal demultiplexing in diagnostic and measurement tools.
• Retro Computing: Popular in legacy TTL-based designs due to its compatibility and robustness.

Conclusion of SN74ALS139N

The SN74ALS139N stands out as a versatile, high-reliability decoder/demultiplexer, combining dual functionality, TTL compatibility, and strong output drive in a single package. Its low power consumption, wide operating voltage, and industrial-grade temperature range make it a preferred choice for digital logic design, embedded systems, and legacy hardware repairs. Texas Instruments’ reputation for quality ensures long-term availability and performance consistency, making this IC a dependable solution for engineers and hobbyists alike.

SN74ALS139N Documents

Download datasheets and manufacturer documentation for SN74ALS139N

Datasheets :

SN54ALS139, SN74ALS139      

HTML Datasheet :

SN54ALS139, SN74ALS139      

PCN Design/Specification :

Material Set 30/Mar/2017