74HC238N 3-8 Decoder/Demultiplexer IC is a high-performance CMOS logic integrated circuit designed for address decoding, data routing, and control signal generation in digital electronic systems. Based on High-Speed CMOS (HC) technology, the 74HC238N delivers fast switching speeds, low power consumption, and excellent noise immunity, making it an ideal replacement for traditional TTL logic devices.
This IC accepts three binary select inputs and decodes them into eight mutually exclusive active-LOW outputs, allowing precise control of multiple devices from a minimal number of control lines. With three enable inputs (two active-LOW and one active-HIGH), the 74HC238N provides flexible enable control, making it suitable for microprocessor-based systems, memory address decoding, and digital control circuits.
Housed in a standard 16-pin DIP package, the 74HC238N is easy to use on breadboards, PCBs, and educational prototyping platforms. It is widely adopted in embedded systems, industrial electronics, and academic labs due to its reliability, versatility, and compatibility with both TTL and CMOS logic levels.
Key Features of 74HC238N Decoder IC
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3-to-8 line decoder / demultiplexer functionality
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Eight active-LOW outputs for precise device selection
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Three enable inputs (2 active-LOW, 1 active-HIGH) for flexible control
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High-speed CMOS technology for fast propagation delay
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Low power consumption, ideal for battery-powered designs
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Wide operating voltage range from 2V to 6V
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TTL-compatible inputs at 5V operation
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High noise immunity for stable digital performance
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Standard 16-pin DIP package for easy handling and prototyping
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Direct replacement for 74LS238 with reduced power dissipation
Technical Specifications
| Parameter | Specification |
|---|---|
| IC Type | 3-to-8 Decoder / Demultiplexer |
| Logic Family | High-Speed CMOS (74HC) |
| Number of Inputs | 3 Select + 3 Enable |
| Number of Outputs | 8 (Active-LOW) |
| Operating Voltage (Vcc) | 2V to 6V |
| Input Logic Level | TTL compatible at 5V |
| Output Logic Level | CMOS |
| Propagation Delay | Typically 13 ns @ 5V |
| Power Consumption | Very low static power |
| Output Drive Capability | ±5.2 mA |
| Package Type | DIP-16 (N) |
| Operating Temperature | –40°C to +85°C |
Working Principle
The 74HC238N decodes the binary combination applied to its three select inputs (A0, A1, A2) into one of eight outputs (Y0–Y7). When the IC is enabled, only one output goes LOW at a time, corresponding to the select input combination, while all other outputs remain HIGH. This behavior makes it ideal for chip select generation, data line routing, and device addressing.
When disabled via the enable pins, all outputs remain in the inactive HIGH state, ensuring safe and predictable operation in multi-device environments.
Applications of 74HC238N IC
The versatility of the 74HC238N makes it suitable for a wide range of digital and embedded applications:
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Memory address decoding (RAM, ROM, EEPROM selection)
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Microcontroller and microprocessor systems
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I/O port expansion
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Data demultiplexing circuits
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Chip select logic
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Digital control systems
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Embedded system development
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Industrial automation circuits
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Communication system signal routing
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Educational and laboratory experiments
Why Choose 74HC238N?
The 74HC238N 3-to-8 Decoder/Demultiplexer IC offers an excellent balance of speed, efficiency, and reliability. Compared to older TTL-based decoders, it consumes significantly less power while providing faster switching and greater design flexibility. Its compatibility with modern logic levels and ease of integration make it a preferred choice for both professional engineers and electronics enthusiasts.
Whether you are designing a complex embedded system or building a simple digital logic project, the 74HC238N ensures accurate decoding, clean signal control, and dependable performance.
Package Includes:
1 x 74HC238N 3-8 Decoder/Demultiplexer IC
FAQ
1. Where can we buy this 74HC238N 3-8 Decoder/Demultiplexer IC?
This product is available online https://aiiottech.in/product/74hc238n-3-8-decoder-demultiplexer-ic/ and also available at our store in Pudupakkam/Kelambakkam, Chennai-603103
2. When can I get this 74HC238N 3-8 Decoder/Demultiplexer IC?
RGRJ AIIoT TECHNOLOGIES will immediately ship and deliver the product within 1-3 working days.
Video Link: 3:8 74138 Decoder IC
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