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LGE 1N4742
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- LGE 1N4742
- Type
- LGE
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- LGE
- Electronic Component
- 1N4742
- Electronic Component
- 1
- Package
- DO-41
- Electronic Component
- Zener Diode
- Electronic Component
- 0.3g
- Electronic Component
- 1
- (Zzk)
- 700Ω
- (Zzt)
- 9Ω
- Electronic Component
- BM0226478649
- Diode
- 1
- Current(Ir)
- 5uA
- Power Dissipation(Pd)
- 1W
- Electronic Component
- 11.45V~12.95V
- Electronic Component
- Electronic Component
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
1N4742 产品概述
一、产品简介
1N4742 是一款独立式（轴向 DO-41 封装）稳压二极管，标称稳压值 12V，适用于低功率稳压与基准场合。鲁光（LGE）品牌出品，器件属 1W 级别稳压二极管，结构简单、可靠性高，便于插件或波峰/手工焊接组装，适合通用电子产品、测试平台和电源保护电路使用。
二、主要电气参数
- 标称稳压：12V（稳压范围 11.45V ~ 12.95V）
- 最大耗散功率 Pd：1W（须注意散热与环境温度影响）
- 反向泄漏电流 Ir：≤5µA（典型样品约 3µA，具体以出厂测试为准）
- 小信号阻抗 Zzt：9Ω（在规定测试电流下的小信号动态阻抗）
- 脉冲或低电流时的阻抗 Zzk：700Ω（表示在拐点区域阻抗显著增大）
- 封装：DO-41（轴向引线，便于装配和更换）
三、工作原理与使用要点
1N4742 工作在反向击穿区作为稳压元件使用。典型应用采用串联限流电阻将外部电源与二极管反向端连接，二极管两端维持近似恒定电压。选用时应注意：
- 稳压电流应在数据手册规定的测试电流附近，以保证稳压值与阻抗指标；
- 确保在任何工况下二极管的耗散功率不超过 1W，必要时增大限流电阻或采用散热措施；
- 在低电流（接近拐点）工作时输出电压可能上升且阻抗急剧增大，不适合作为精密参考。
四、应用场景
- 12V 基本稳压与本地去耦，用于传感器、电平转换及小功率模块；
- 基准电压源、比较器参考、过压保护、浪涌钳位与测试电路中作为简单可靠的稳压/钳位元件；
- 教学与原型实验平台，因封装易操作且价格低廉。
五、选型与实际注意事项
- 若负载或滤波需求严格，建议使用带合适容差与温度系数的精密基准或有源稳压器替代；
- 设计时按最坏工况计算最大耗散（Pd = (Vin - Vz) × Iz）并留出安全裕量；
- 焊接时避免长时间高温作用于封装与引线，装配后注意良好散热与通风；
- 若对噪声、温漂有较高要求，注意二极管的温度系数与阻抗对系统性能的影响。
综上，LGE（鲁光）DO-41 封装的 1N4742 为一款性价比高、适用于通用 12V 稳压与钳位的独立式稳压二极管，适合要求不高但需可靠性的多种电子设计。
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