Texas Instruments

SN74ALS139D  

Encoders, Decoders, Multiplexers & Demultiplexers

SN74ALS139D Description

The SN74ALS139D is a high-performance decoder/demultiplexer IC designed for a wide range of digital applications. Manufactured by Texas Instruments, this device belongs to the 74ALS series and is housed in a surface-mount package, making it suitable for compact and high-density PCB designs. The SN74ALS139D features two independent 1 x 2:4 decoding circuits, providing versatile signal routing and control capabilities. It operates within a voltage supply range of 4.5V to 5.5V and is specified for an operating temperature range of 0°C to 70°C, ensuring reliable performance in various environmental conditions.

SN74ALS139D Features

• Dual Independent Decoding Circuits: The SN74ALS139D includes two separate 1 x 2:4 decoding circuits, allowing for simultaneous and independent control of multiple signals. This dual-circuit design enhances flexibility and reduces the need for additional components in complex digital systems.
• Single Supply Operation: With a supply voltage range of 4.5V to 5.5V, the SN74ALS139D simplifies power supply requirements and ensures compatibility with standard digital logic levels.
• Surface-Mount Packaging: The surface-mount package type facilitates easy integration into modern PCB designs, enabling high-density layouts and efficient manufacturing processes.
• Low Power Consumption: The device is designed to operate with minimal power, making it suitable for energy-efficient applications.
• High Output Current Capability: The SN74ALS139D can source up to 400µA and sink up to 8mA, providing robust output drive capabilities for driving various types of loads.
• Moisture Sensitivity Level 1: With an MSL rating of 1, the SN74ALS139D is suitable for unlimited exposure to standard manufacturing environments, reducing the risk of moisture-related failures.
• Compliance and Safety: The SN74ALS139D is REACH unaffected and RoHS3 compliant, ensuring it meets the latest environmental and safety standards for electronic components.

SN74ALS139D Applications

The SN74ALS139D is ideal for a variety of applications where efficient signal decoding and demultiplexing are required. Some specific use cases include:

• Digital Signal Routing: In digital systems, the SN74ALS139D can be used to route signals to multiple destinations based on control inputs, simplifying complex signal management tasks.
• Memory Address Decoding: The device can decode address lines in memory systems, enabling efficient access to specific memory locations.
• Peripheral Control: In microcontroller-based systems, the SN74ALS139D can manage control signals for various peripherals, enhancing system functionality and performance.
• Telecommunications: The SN74ALS139D can be employed in telecommunication equipment for signal switching and routing applications, ensuring reliable and efficient signal handling.

Conclusion of SN74ALS139D

The SN74ALS139D is a versatile and reliable decoder/demultiplexer IC that offers significant advantages over similar models. Its dual independent decoding circuits, single supply operation, and surface-mount packaging make it an ideal choice for a wide range of digital applications. The device's low power consumption, high output current capability, and compliance with environmental standards further enhance its appeal. Whether used in digital signal routing, memory address decoding, peripheral control, or telecommunications, the SN74ALS139D provides robust performance and flexibility, making it a valuable component in modern electronic designs.

SN74ALS139D Documents

Download datasheets and manufacturer documentation for SN74ALS139D

Datasheets :

SN54ALS139, SN74ALS139      

PCN Obsolescence/ EOL :

Mult Dev EOL 30/Aug/2023      

HTML Datasheet :

SN54ALS139, SN74ALS139