onsemi

MM74HCT138MX  

Encoders, Decoders, Multiplexers & Demultiplexers

MM74HCT138MX Description

The MM74HCT138MX from onsemi is a high-speed CMOS 1-of-8 decoder/demultiplexer designed for surface-mount applications. This 3-to-8 line decoder features a single active-low enable input and three binary select inputs, enabling efficient address decoding in digital systems. Operating within a 4.5V to 5.5V supply range, it is compatible with TTL levels, making it ideal for mixed-voltage environments. Packaged in a 16-SOIC reel (Tape & Reel), it is RoHS3 compliant and suitable for automated assembly processes. With a balanced 4.8mA output current (sink/source), it ensures reliable signal distribution in high-speed logic circuits.

MM74HCT138MX Features

• High-Speed CMOS Logic: Ensures low power consumption while maintaining TTL compatibility.
• Wide Voltage Range (4.5V–5.5V): Supports stable operation in 5V systems.
• 3-to-8 Line Decoding: Converts 3-bit binary inputs into 8 mutually exclusive active-low outputs.
• Active-Low Enable (G1, G2A, G2B): Provides flexible control for cascading multiple devices.
• Balanced Output Drive (4.8mA): Capable of driving moderate loads without external buffers.
• Surface-Mount (16-SOIC): Compact footprint for space-constrained PCB designs.
• MSL 1 (Unlimited): No moisture sensitivity concerns during storage or handling.

MM74HCT138MX Applications

• Memory Address Decoding: Efficiently selects memory blocks in microcontrollers and FPGAs.
• Data Routing: Acts as a demultiplexer in bus-oriented systems.
• Industrial Control Systems: Used in PLCs for I/O expansion and signal distribution.
• Automotive Electronics: Reliable performance in 5V automotive logic circuits.
• Consumer Electronics: Enables port selection in AV equipment and display drivers.

Conclusion of MM74HCT138MX

The MM74HCT138MX stands out for its TTL compatibility, robust output drive, and compact packaging, making it a versatile choice for address decoding and signal distribution in 5V systems. Its low power consumption, high noise immunity, and ease of integration make it superior to older bipolar decoders. Ideal for industrial, automotive, and consumer applications, this decoder/demultiplexer combines performance with reliability, backed by onsemi’s quality assurance.

MM74HCT138MX Documents

Download datasheets and manufacturer documentation for MM74HCT138MX