WMSIC Electronic Components

HGSEMI 74HC138N

Model74HC138N
PackageDIP-16
BrandHGSEMI
Price Price on request Electronic component prices change quickly with market supply and demand. Please refer to the latest WMSIC quotation for current pricing.
Configuration
1 options
Configuration Electronic Component

Available for RFQ

Technical data

Product details

19 specifications

Core information

Product name
HGSEMI 74HC138N
Type
HGSEMI
Minimum package
1000 盒

Technical parameters

Electronic Component
Electronic Component
Electronic Component
HGSEMI
Electronic Component
74HC138N
Electronic Component
1
Package
DIP-16
Type
Decoder
Electronic Component
Signal Switch / Codec / Multiplexer
Electronic Component
1.618g
Electronic Component
1
Features
Electronic Component
Electronic Component
BM0265410227
Operating Temperature
40℃~+85℃
Operating Voltage
2V~6V
Power Supply
Power Supply
Current(IOH)
25mA
Current(IOL)
4mA

For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.

74HC138N 产品概述

一、概述

74HC138N 是一款高性能的 3-to-8 译码器/去码器(decoder/demultiplexer),由 HGSEMI(华冠)生产,采用 DIP-16 封装。器件工作电压范围宽(2V~6V),适用于多种低压到传统 5V 的数字电路系统。器件内置使能端,输出为有源低(active LOW),常用于地址译码、片选驱动与信号分路。

二、主要参数

  • 类型:解码器(3 输入,8 输出)
  • 工作电压:2V ~ 6V
  • 输入数 / 输出数:3 / 8
  • 灌电流 (IOL):4 mA(输出下拉能力)
  • 工作温度:-40 ℃ ~ +85 ℃
  • 传播延迟 (tpd):35 ns @ 6.0V, CL = 50 pF
  • 静态电流 (Iq):160 μA
  • 品牌:HGSEMI(华冠)
  • 封装:DIP-16

三、功能与工作原理

74HC138N 通过三个地址输入(A、B、C)对八个输出(Y0–Y7)进行译码。当使能端满足激活条件时,输入的二进制编码将使对应的一个输出变为低电平,其余输出为高电平(有源低输出)。器件通常提供一个或多个使能引脚,用以实现总线上对译码器的选通/屏蔽。

四、典型应用场景

  • 存储器/外设的地址译码与片选(Chip Select)
  • 多路选择或去复用逻辑控制(低速信号分配)
  • 数字系统中的中断或资源仲裁逻辑
  • 小型 FPGA/MCU 外围地址电路与扩展 I/O 选择

五、设计与使用要点

  • 输出为有源低,若用于拉高电平需外接上拉电阻或后级输入自带上拉。
  • 建议在 VCC 近端并联 0.1 μF 陶瓷去耦电容以抑制瞬态噪声。
  • 在多器件并联或总线上使用时注意避免输出冲突(总线争用),避免超过 IOL 及 IOH 的限值。
  • 对延时敏感应用需参考 35 ns 的典型传播延迟,并考虑负载电容(CL)对速度的影响。
  • 环境温度范围 -40 ℃ 至 +85 ℃,适用于工业级温度要求,但高温下静态电流和时序特性会有所变化。

六、封装与可靠性

DIP-16 封装便于面包板与插件式插装,适合开发与小批量应用。器件在正常使用范围内具有稳定的静态电流(典型 160 μA),低功耗特性使其在电池供电与低功耗系统中也具有实用价值。出厂选型时请确认所需电平、驱动能力与封装形式符合整体系统设计要求。

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