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HXY MOSFET ZM4742A
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- HXY MOSFET ZM4742A
- Type
- HXY MOSFET
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- HXY MOSFET
- Electronic Component
- ZM4742A
- Electronic Component
- 1
- Package
- LL-41
- Electronic Component
- Zener Diode
- Electronic Component
- 0.171g
- Electronic Component
- 1
- (Zzk)
- 700Ω
- (Zzt)
- 9Ω
- Electronic Component
- BM0257710737
- Diode
- 1
- Current(Ir)
- [email protected]
- Power Dissipation(Pd)
- 1W
- Electronic Component
- 10.8V~13.2V
- 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.
ZM4742A 稳压二极管（12V / 1W）产品概述
一、产品简介
ZM4742A 是华轩阳电子（HXY MOSFET）推出的一款独立式稳压二极管，标称稳压值为 12V，封装为 LL-41 轴向封装，适用于一般功率较低的电源稳压和基准场合。器件额定耗散功率为 1W，反向漏电流 Ir 为 5µA（在 9.1V 时），稳压值允许范围为 10.8V ~ 13.2V。
二、主要电气参数
- 标称稳压值：12V（ZM4742A）
- 稳压值范围：10.8V ~ 13.2V
- 反向电流 Ir：5µA @ 9.1V（低漏电，适合低功耗电路）
- 最大耗散功率 Pd：1W（封装及散热条件影响实际可用功率）
- 小信号阻抗 Zzt：9Ω（在标准测试条件下，反映动态稳压性能）
- 脉降阻抗 Zzk：700Ω（表征跌落区和低电流下的“膝”特性）
三、工作原理与应用场景
ZM4742A 在反向偏置工作时利用齐纳击穿或雪崩机制实现电压钳位与参考。因其 12V 等级与 1W 功率，常用于：
- 小功率线性稳压与分流基准
- 过压保护与脉冲抑制（配合串联电阻或限流器）
- 仪表、传感器供电参考、试验台基准源等场合
四、选型与电路设计要点
- 最大稳压电流近似由 Pd / Vz 给出：Iz_max ≈ 1W / 12V ≈ 83mA；建议长期工作电流在该值的 50% 以下，以保证可靠性（约 ≤40mA），并留有余量应对环境温升。
- 串联限流电阻计算：Rs = (Vin - Vz) / Iz_total（Iz_total = 稳压二极管电流 + 负载电流），设计时应兼顾最小偏流和最大偏流状态。
- 动态阻抗 Zzt = 9Ω 表明在变化电流时会有一定压降，若要求高精度参考，应采用合适偏流或后端稳压放大电路以降低误差。
- 低电流特性（Zzk 较大）提示在非常小偏流下稳压“膝”较软，应避免将器件长期工作在极低偏流状态。
五、封装与热管理
LL-41 为轴向（玻璃）小封装，适用于穿孔安装。1W 等级的功耗依赖于环境温度与散热路径，轴向封装主要通过引线和周围空气散热。设计时应：
- 保证引线和焊盘有良好热传导路径；
- 在高环境温度或高占空比工作下采取降额（derating）；
- 遵循厂商焊接温度及回流规范以免损伤封装。
六、使用与可靠性建议
- 长期使用建议控制结温与耗散不超过额定的一半至三分之二；
- 对于对噪声、精度要求高的场合，配合滤波与隔离电路以降低温漂与噪声影响；
- 出货检验可包含稳压电压、漏电流、耐压与热循环测试等项目，确保长期稳定性。
七、总结
ZM4742A 为一款通用的 12V、1W 级独立式稳压二极管，适合小功率稳压、过压防护与基准提供。设计时应注意热管理、偏流工作点及动态阻抗对稳压精度的影响。详细参数与应用建议请参考华轩阳电子的完整数据手册，以获得更精确的测试条件与曲线。
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