Model & package intelligence
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CJ SMAJ20CA
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- CJ SMAJ20CA
- Type
- CJ
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- CJ
- Electronic Component
- SMAJ20CA
- Electronic Component
- 1
- Package
- SMAG
- Electronic Component
- Electronic Component
- Type
- TVS
- Electronic Component
- ESD and Surge Protection (TVS / ESD)
- Electronic Component
- 0.082g
- Electronic Component
- 1
- Electronic Component
- BM0233613187
- Voltage
- 32.4V
- Current(Ir)
- 5uA
- Voltage(VBR)
- 22.2V
- Electronic Component
- Electronic Component
- Electronic Component
- 5000
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SMAJ20CA 产品概述
一、产品简介
SMAJ20CA 是 CJ（江苏长电/长晶）推出的一款双向瞬态抑制二极管（TVS），采用紧凑的 SMAG 表面贴装封装。其额定反向工作电压 Vrwm 为 20V，典型击穿电压为 22.2V，在峰值脉冲电流 Ipp 12.3A 条件下的钳位电压约为 32.4V，峰值脉冲功率 Ppp 为 400W，反向漏电流仅 5µA（在 Vrwm 条件下）。该器件适用于需要双向过冲保护的直流或交流系统、通信接口及工业控制电源等场合。
二、主要电气参数说明
- 极性：双向（可对正、负极性瞬态脉冲进行对称钳位，适用于交流或双向信号保护）。
- 反向截止电压 Vrwm：20V（器件在此电压下长期工作）。
- 击穿电压（Vbr）：22.2V（进入雪崩导通区的起始电压）。
- 钳位电压：32.4V（在指定脉冲电流条件下的最大钳位电压，保护被保护电路不被更高电压损坏）。
- 峰值脉冲电流 Ipp：12.3A（对应钳位电压时的瞬态电流能力）。
- 峰值脉冲功率 Ppp：400W（器件对短时大能量脉冲的抑制能力）。
- 反向电流 Ir：5µA（低漏电便于低功耗应用）。
三、典型应用场景
- 工业控制与自动化电源总线保护（24V系统旁路型保护）。
- 电源模块和开关电源的输出/输入瞬态保护。
- 串行通信接口与双向数据线的浪涌与雷击保护（需同时考虑管脚容性）。
- 逆变器或电机驱动控制板的直流链路瞬态抑制。
四、设计与布局建议
- 靠近受保护节点放置 TVS，尽量缩短引线长度以降低寄生电感。
- 在高峰值能量应用中，配合熔断器或限流电阻使用，以减轻器件应力并提高系统复位能力。
- 注意散热，尽管峰值能量高但平均耗散较小，长时间重复脉冲可能导致过热，应在 PCB 上留热铜和热孔。
- 双向器件无极性，安装时无需考虑方向，但仍须保证焊接可靠性和机械固定。
五、选型注意事项
- 确认受保护电路允许的最大钳位电压，钳位电压应低于被保护器件的耐压等级。
- 若保护高速信号或敏感数据线，应关注 TVS 的结电容参数（本产品为一般功率型，若对信号完整性敏感建议选用低容型 TVS）。
- 对于持续高能量脉冲或汽车级别冲击，应选择有相应认证与更高功率等级的器件。
六、可靠性与使用注意
- 在焊接时遵循制造商推荐的回流温度曲线，避免过热引起器件性能退化。
- 存储与搬运应防潮、防静电，SMT 贴装后如长时间不通电应注意储存环境。
- 对关键系统建议进行实际浪涌/ESD 试验验证，以确认在系统行为下的保护效果。
SMAJ20CA 以其 20V 的工作电压、较低漏电和 400W 的瞬态承受能力，适合用于中低压直流/交流系统的浪涌保护，是通用型、性价比较高的 TVS 保护选择。
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