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CJ BZX84C4V7
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- CJ BZX84C4V7
- Type
- CJ
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- CJ
- Electronic Component
- BZX84C4V7
- Electronic Component
- 1
- Package
- SOT-23
- Electronic Component
- Zener Diode
- Electronic Component
- 0.036g
- Electronic Component
- 1
- (Zzk)
- 500Ω
- (Zzt)
- 80Ω
- Electronic Component
- BM0227649259
- Diode
- 1
- Current(Ir)
- 3uA@2V
- Power Dissipation(Pd)
- 300mW
- Electronic Component
- 4.4V~5V
- 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.
BZX84C4V7 产品概述
一、产品简介
BZX84C4V7 是一款独立式小信号稳压二极管，标称稳压值 4.7V（允许范围 4.4V～5.0V），由 CJ（江苏长电/长晶）提供，采用 SOT-23 小封装。该器件适合贴片安装，体积小、成本低，常用于微功率稳压、浪涌吸收和电压参考场合。
二、主要电气参数
- 标称稳压 Vz：4.7V（范围 4.4V～5.0V）
- 耗散功率 Pd：300 mW（器件最大允许功耗，注意散热条件）
- 反向电流 Ir：3 μA @ 2V（反向漏电流小，有利于低功耗电路）
- 阻抗 Zzk：500 Ω（低电流区动态阻抗或转折区阻抗）
- 阻抗 Zzt：80 Ω（测试电流下的动态阻抗，决定稳压随电流变化的幅度）
- 二极管配置：独立式（离散器件，非集成）
- 封装：SOT-23（便于表面贴装与自动化生产）
以上参数用于评估稳压精度、负载能力与热极限。在使用前应参考完整数据表，确认测试电流 Iz 和测量条件。
三、封装与热管理
SOT-23 封装体积小，但热阻相对较高，器件的最大耗散功率 300 mW 通常在良好散热条件（PCB大面积铜箔）下才能接近。设计时应注意：
- 计算稳压器工作电流 Iz，使耗散功率 Pd = (Vin - Vz) * Iz 不超过器件允许值并留有裕量。
- 若输入电压较高或负载电流较大，应增加串联限流电阻或采用功率更大的封装/稳压方案。
示例：Pd 限制下的最大稳流 Iz_max = Pd / (Vin - Vz)。
四、典型应用
- 低功耗参考电压源：为 ADC、比较器等电路提供稳定参考。
- 过压保护/电压箝位：限制瞬态尖峰，保护后级电路。
- 基础稳压电路：与串联电阻组成简单的分流稳压器（输出负载较小时效果更佳）。
- 信号钳位、电平移位等小信号应用。
五、选型与使用建议
- 若负载变化或稳压精度要求较高，优先考虑动态阻抗更低或精度更高的型号；Zzt=80 Ω 表明在测试电流下仍有一定的电压随电流波动。
- 关注温度特性和偏移，实际稳压值会随温度变化，复杂或高精度场合建议采用基准源或线性稳压芯片。
- PCB 布局中应在二极管附近留出散热铜箔，避免热集中。焊接工艺按 SOT-23 要求进行，避免过热或机械应力。
六、检验与替代方案
- 生产检验关注稳压值、反向漏电流和耗散能力；常规试验可在指定测试电流下测量 Vz、在 2 V 下测 Ir。
- 若需更高功率或更低动态阻抗，可选用更大封装或线性稳压芯片；若仅作过压保护，也可考虑 TVS 二极管。
总结：BZX84C4V7 在 SOT-23 封装中提供稳定的 4.7V 基准与低漏电特性，适合微功率稳压与钳位应用。设计时应综合考虑输入电压、负载电流及散热条件，确保在安全耗散范围内使用，以获得稳定可靠的工作性能。
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