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CJ SMAJ18A
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- CJ SMAJ18A
- Type
- CJ
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- CJ
- Electronic Component
- SMAJ18A
- 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
- BM0233613191
- Voltage
- 29.2V
- Current(Ir)
- 5uA
- Voltage(VBR)
- 20V
- 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.
SMAJ18A 产品概述
一、基本参数
SMAJ18A 为单向瞬态抑制二极管（TVS），品牌：CJ（江苏长电/长晶），常见封装为 SMAG（SMA 型式）。主要电气参数如下：反向工作电压 Vrwm = 18V，击穿电压（典型）Vbr ≈ 20V，钳位电压 Vc ≈ 29.2V（在规定脉冲条件下），峰值脉冲电流 Ipp = 13.7A，峰值脉冲功率 Ppp = 400W，反向电流 Ir ≈ 5µA。器件类型为单向 TVS，适合用于直流/单向脉冲抑制场合。
二、主要特性
- 单向设计：针对正向工作方向对瞬态过压提供低钳位电压保护，能在浪涌事件发生时迅速导通，将能量钳制在安全电平。
- 高瞬态功率吸收：Ppp 400W 表示在标准脉冲波形下具备良好吸能能力，适用于短时雷击、开关浪涌或感性负载释放等脉冲事件。
- 低静态漏电：Ir 约 5µA，有利于对低功耗电路的长期可靠性影响最小化。
- 紧凑封装：SMAG（SMA）封装便于波峰/回流焊装配，适合自动化贴装与体积受限电路板。
三、典型应用场景
- 车载 12V/24V 子系统的浪涌保护（仪表、传感器线束、点火抑制等）；
- 电源输入端、DC-DC 变换器及电源模块的过压/浪涌抑制；
- 工业控制设备与通信设备的外部接口防护；
- 继电器、马达等感性负载旁的开关瞬变抑制。
四、封装与安装建议
SMAG（SMA）封装需靠近被保护线路的引脚或连接点放置，以减小寄生电感并提高响应速度。布局时应尽量缩短引线长度，避免与高频走线并行；必要时在器件与地之间保持低阻抗回流路径。焊接应遵循制造商的温度曲线与时长限制，避免过热导致器件性能退化。
五、使用注意事项
- 选型确认：Vrwm = 18V 适用于在稳态电压低于此值的系统；若工作电压长期接近 Vrwm，应考虑适当裕量以减少误触发。
- 热管理：在频繁浪涌或高能量事件下器件温升较大，应考虑散热或并联方案（并联需注意匹配问题）。
- 可靠性：长期承受接近 Ppp 的冲击会降低器件寿命，应在系统级采取限流或一级浪涌抑制。
- 储存与搬运：避免潮湿和静电冲击，按厂家建议保存与焊接。
六、选型与替代建议
如需更低钳位、更高峰值电流或双向保护，可比较同类型号或升级到更高功率等级的 TVS 器件；对更苛刻的汽车级要求，请选择具有 AEC-Q100 认证的同类产品并核实温度与冲击规范。总之，SMAJ18A 适合对 18V 左右工况下要求响应快、体积小且能承受短时高能冲击的保护场合。
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