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SN74HC138DR

3-to-8 Decoder/Demux, 2-6V, active-low outputs, SOIC-16

9580

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制造商零件：

SN74HC138DR

包装：

SOIC-16 (9.9×3.9 mm, 1.27mm pitch)

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说明

产品概览

The SN74HC138DR is a 3-line to 8-line decoder/demultiplexer from Texas Instruments. It accepts a 3-bit binary input and activates one of eight mutually exclusive outputs. With active-low outputs and multiple enable inputs, it is widely used for address decoding, data demultiplexing, and chip-select generation in digital systems. Packaged in SOIC-16.

主要规格

逻辑家族 74HC (High-speed CMOS)
功能 3-to-8 Decoder/Demultiplexer
Supply Voltage Range 2.0V to 6.0V
传播延迟 ~25 ns at 5V
Output Drive ±5.2 mA at 5V
Inputs 3 address (A, B, C) + 3 enable (G1, G2A, G2B)
Outputs 8 active-low (Y0-Y7)
静态电流 40 µA max at 25°C
工作温度 -40°C to +85°C
包装 SOIC-16 (3.9 mm width)

特点

  • 3-to-8 line decoding with active-low outputs
  • Three enable inputs (one active-high, two active-low) for easy cascading
  • Mutually exclusive output selection
  • Standard 74HC pinout compatible across manufacturers
  • Low quiescent power consumption
  • Input clamp diodes for overvoltage protection

应用

  • Memory address decoding and chip-select generation
  • Data demultiplexing in digital communication
  • I/O port expansion with enable gating
  • Clock distribution and enable signal routing
  • Cascaded decoding for larger address spaces

The SN74HC138DR from Texas Instruments is a 3-line to 8-line decoder/demultiplexer in the 74HC logic family. It accepts a 3-bit binary address and activates one of eight active-low outputs. Three enable inputs (G1 active-high, G2A and G2B active-low) allow easy cascading for larger decoding applications. Operating from 2V to 6V with low quiescent current, it is ideal for address decoding and data routing in digital systems.

The SN74HC138DR decodes a 3-bit binary input (A, B, C) to activate one of eight outputs (Y0-Y7). The outputs are active-low, meaning the selected output goes LOW while all others remain HIGH. The device is enabled only when G1 is HIGH and both G2A and G2B are LOW. If any enable condition is not met, all outputs are forced HIGH (inactive). The internal logic consists of AND-OR gates that implement the demultiplexing function, with the enable inputs ANDed into each output gate to provide the global enable function.

针脚 名称 类型 功能
1 A 输入 Address input LSB
2 B 输入 Address input middle bit
3 C 输入 Address input MSB
4 G2A 输入 Enable (active-low)
5 G2B 输入 Enable (active-low)
6 G1 输入 Enable (active-high)
7 Y7 输出 Decoded output 7 (active-low)
8 接地 电源 地面
9 Y6 输出 Decoded output 6 (active-low)
10 Y5 输出 Decoded output 5 (active-low)
11 Y4 输出 Decoded output 4 (active-low)
12 Y3 输出 Decoded output 3 (active-low)
13 Y2 输出 Decoded output 2 (active-low)
14 Y1 输出 Decoded output 1 (active-low)
15 Y0 输出 Decoded output 0 (active-low)
16 VCC 电源 Supply voltage (2-6V)
  • Memory address decoding for microprocessor systems
  • Chip-select generation for multiple peripheral ICs
  • Data demultiplexing in digital communication systems
  • I/O port expansion using enable gating logic
  • Cascaded decoding for 4-to-16 or larger address spaces
制造商 部件编号 包装 说明
Nexperia 74HC138D SOIC-16 Direct equivalent from Nexperia
ON Semiconductor MC74HC138ADR2G SOIC-16 Direct equivalent from onsemi
东芝 TC74HC138AP DIP-16 Through-hole equivalent
TI SN74HC138N DIP-16 Through-hole version
Nexperia 74HCT138D SOIC-16 TTL input level variant
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质量保证

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

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2. Strict Full-batch Quality Inspection

We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

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联系我们

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Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

发货与付款

Materialparts is a professional global supplier of electronic components with over 20 years of industry experience. We provide one-stop supply of passive components, integrated circuits, as well as parts for industrial control, automotive electronics, consumer electronics and medical devices. Below are the unified shipping and payment policies applicable to all orders, samples and bulk purchases worldwide.

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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

服务与包装

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

Core Services

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2. Genuine Product Guarantee & Full-process Quality Inspection

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Professional Packaging Standards

Electronic components are sensitive to static electricity, collision, moisture and dust. We adopt industry-standard anti-static packaging solutions to fully ensure the integrity of goods during transportation and storage.

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We provide value-added services including personalized packaging, custom labeling and re-reeling according to customer requirements, fully matching your production and warehouse management standards.

Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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