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XINLUDA XD74LS138
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- XINLUDA XD74LS138
- Type
- XINLUDA
- Minimum package
- 1000 盒
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- XINLUDA
- Electronic Component
- XD74LS138
- Electronic Component
- 1
- Package
- DIP-16
- Type
- Decoder
- Electronic Component
- Signal Switch / Codec / Multiplexer
- Electronic Component
- 1.63g
- Electronic Component
- 1
- Electronic Component
- BM0228584647
- Operating Temperature
- 0℃~+70℃
- Operating Voltage
- 4.75V~5.25V
- Power Supply
- Power Supply
- Current(IOH)
- 400uA
- Current(IOL)
- 8mA
- (tpd)
- 41ns@5V,15pF
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
XD74LS138 产品概述
一、产品概述
XD74LS138（信路达 XINLUDA）为经典的三选八译码器/去码器，采用DIP-16封装，工作电压4.75V～5.25V，工业级温度范围0℃～+70℃。器件将3位二进制输入译码为8路互斥的低电平输出，常用于地址译码、片选、GPIO扩展及现代数字系统的控制逻辑中。该器件保持传统TTL（低功耗肖特基LS）特性，适合与5V逻辑系统直接兼容。
二、主要特性
- 类型：3-to-8 解码器/译码器（3输入，8输出）
- 工作电压：4.75V～5.25V（典型5V电源）
- 输入/输出：3 输入（A、B、C）/8 输出（Y0～Y7）
- 电流能力：灌电流 IOL = 8mA（低电平有效时），拉电流 IOH = 400µA（高电平源出能力较小）
- 工作温度：0℃～+70℃（商业温度范围）
- 封装：DIP-16，易于面包板和模块化开发
- 输出为有源低（active LOW），通常未选中通道为高电平
三、功能与引脚要点
XD74LS138 通常带有三个地址输入（A、B、C）和三个使能端（一个高电平使能 G1，两个低电平使能 /G2A、/G2B）。只有当使能条件满足时，输入位组合才被译码到相应的低电平输出。器件输出为有源低，因此选中的输出为低电平，其余输出为高电平（高电平为弱源出状态，IOH仅约400µA）。
四、典型应用场景
- 存储器或外围器件的片选/地址解码
- 多路选择与地址放大器（微处理器系统）
- 小规模逻辑扩展（把3位地址扩展为8路控制信号）
- LED、蜂鸣器等驱动（需注意输出电流限制与外部缓冲）
五、使用注意与设计建议
- 由于IOH较小（约400µA），输出高电平无法驱动较大负载，高电平状态下如需较大源电流应加上上拉电阻或使用缓冲驱动器（如74LS244、74HC系列驱动器）。
- 低电平灌电流能力较好（IOL = 8mA），可直接驱动小负载或作为选通信号，但不建议直接驱动大电流器件。
- 电源稳定性对TTL逻辑尤为重要，PCB上VCC与GND应接近器件引脚布置0.1µF去耦电容以抑制瞬态干扰。
- 输出为有源低，请在系统设计时注意逻辑极性；若需要正逻辑输出，可在后级加反相器。
- 避免长走线与高频噪声，必要时在关键信号线上加入RC滤波或阻尼以减少振铃。
六、选型与替代建议
XD74LS138 适合需要与传统TTL逻辑兼容并在5V系统中工作的场景。如需更低功耗或更强的输出驱动能力，可考虑74HC138（CMOS，源/吸电流性能不同）或在输出端加专用驱动器。在批量采购或替换时，关注封装（DIP-16）与温度等级是否匹配系统要求。
总结：XD74LS138 是一款可靠的3-to-8译码器，适合多数5V数字系统的地址译码与控制信号扩展。合理的电流匹配与去耦设计能保证在嵌入式与数字控制系统中稳定运行。
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