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ST ZM4733APF Zener diode ZM4733APF
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- ST ZM4733APF
- Type
- ST
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- ST
- Electronic Component
- ZM4733APF
- Electronic Component
- 1
- Package
- LL-41
- Electronic Component
- Zener Diode
- Electronic Component
- ±5%
- Electronic Component
- 0.131g
- Electronic Component
- 1
- (Zzk)
- 550Ω
- (Zzt)
- 7Ω
- Electronic Component
- BM0225730362
- Diode
- 1
- Current(Ir)
- 10uA
- Power Dissipation(Pd)
- 1W
- 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.
ZM4733APF 5.1V 1W（LL-41）产品概述
一、概述
ZM4733APF 是一款标称稳压值为 5.1V 的低功耗稳压二极管，封装为 LL-41 轴向玻璃封装，适用于通孔安装的基准与过压钳位场合。产品品牌为 ST（先科），额定耗散功率为 1W，适合用作小功率基准源、并联稳压或峰值钳位元件。
二、主要电气参数
- 标称稳压值（Vz）：5.1V（±5% 精度）
- 额定耗散功率（Pd）：1W（在规定散热条件下）
- 反向电流（Ir，漏电流）：10 μA（在规定反向电压下）
- 低电流阻抗（Zzk）：550 Ω（低电流区域的阻抗）
- 测试/稳态阻抗（Zzt）：7 Ω（在规定测试电流下的动态阻抗）
以上参数用于评估电路中稳压精度、负载调节与噪声特性。特别注意 Zzk 与 Zzt 分别反映在低电流与工作电流下的阻抗差异，对设计偏置电流有直接影响。
三、典型应用
- 作为 5.1V 参考源：为小型传感器、比较器或 ADC 提供基准电压。
- 并联稳压/分压补偿：与限流电阻配合，用于低成本稳压电路。
- 过压钳位与浪涌保护：在输入突波或反向瞬态时起保护作用。
- 偏置与检测电路：为放大器或逻辑电路提供稳定偏置电压。
四、使用建议与计算
- 限流电阻 R 的选择：R = (Vin - Vz) / Iz，其中 Iz 为流过稳压管的工作电流。
- 功率校核：稳压管功耗 Pz = Vz × Iz，应满足 Pz ≤ Pd（并考虑温升与环境）。例如：若 Vin = 12V，选 Iz = 50 mA，则 R ≈ 138 Ω，Pz ≈ 5.1 × 0.05 = 0.255 W，远低于 1W。
- 最大允许电流近似：Iz_max ≈ Pd / Vz ≈ 1 W / 5.1 V ≈ 196 mA，但实际应考虑封装散热和环境温度，通常建议在稳态工作时留裕量（如 ≤50–100 mA）。
- 布局与散热：LL-41 为轴向玻璃封装，散热依赖引线与 PCB，避免紧邻高发热元件，必要时在电路板上留散热开阔区或采用散热片/铜箔加宽引脚散热路径。
- 注意反向漏流与温漂：低电流下 Zzk 较大，稳压点受电流变化影响明显；反向漏流在高温下会上升，应在设计中考虑温度系数与精度要求。
五、封装与可替代型号
- 封装：LL-41（轴向玻璃，通孔，常见于 DO-41 类封装尺寸）。
- 常见可替代型号（需逐项核对具体参数）：1N4733A、BZT52C5V1 等 5.1V、1W 级别的稳压二极管。选择替代品时请核对稳压电压容差、阻抗、漏电流与散热能力。
六、结论
ZM4733APF（5.1V，1W，LL-41）适合用在小功率基准、并联稳压与浪涌钳位等场合。设计时应按最大耗散功率和动态阻抗选择偏置电流，注意散热与工作环境对稳压性能和可靠性的影响。
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