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CJ SMF18A
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- CJ SMF18A
- Type
- CJ
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- CJ
- Electronic Component
- SMF18A
- Electronic Component
- 1
- Package
- SOD-123FL
- Electronic Component
- Electronic Component
- Type
- TVS
- Electronic Component
- ESD and Surge Protection (TVS / ESD)
- Electronic Component
- 0.044g
- Electronic Component
- 1
- Electronic Component
- BM0230879365
- Voltage
- 29.2V
- Current(Ir)
- 1uA
- Voltage(VBR)
- 22.1V
- Electronic Component
- Electronic Component
- Electronic Component
- 3000
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SMF18A 产品概述
一、产品简介
SMF18A 为江苏长电/长晶（CJ）生产的一款瞬态抑制二极管（TVS），单向结构，封装为 SOD-123FL。该器件用于抑制电源线或信号线上的瞬态过电压、浪涌和雷击感应脉冲，保护下游电路免受损坏。典型应用包括汽车电子 12V 总线、通信设备、电源输入和工业控制等需要对瞬态过压保护的场合。
二、主要电气参数
- 极性：单向（定向钳位，正向通流方向明确）
- 反向截止电压 Vrwm：18V（工作电压范围内的稳态钳位/驻留电压）
- 击穿电压 Vbr：22.1V（标称击穿起始点）
- 钳位电压 Vc：29.2V（在指定脉冲电流下的钳位值）
- 峰值脉冲电流 Ipp：6.8A @ 10/1000μs（标准浪涌波形）
- 峰值脉冲功率 Ppp：200W @ 10/1000μs（对应短时能量吸收能力）
- 反向电流 Ir：1μA（在 Vrwm 条件下的泄漏电流，典型值）
三、性能亮点
- 强抗浪涌能力：Ppp 200W、Ipp 6.8A 能承受常见的浪涌事件（10/1000μs 波形）。
- 低漏电流：Ir 仅 1μA，适用于对静态功耗敏感的电路。
- 明确的钳位性能：29.2V 的钳位电压可在保护与系统耐受性之间取得平衡。
- 小型低剖面封装：SOD-123FL 便于贴片工艺，占板面积小，适合紧凑设计。
四、典型应用场景
- 汽车 12V/24V 电源输入的浪涌保护（需结合系统能量等级选择）
- 电源输入端防雷击、浪涌保护（工业电源、UPS 边缘）
- 通信接口和数据线的瞬态抑制（注意单向器件对信号极性的要求）
- PCB 上敏感器件、MCU、电源模块的局部护航
五、设计与使用建议
- 单向 TVS 应按极性安装：阴极朝向将被钳位的高电位侧。
- 布局：尽量将 TVS 放置在受保护点与接地之间，走线最短，焊盘与地之间保持良好低阻连接以减小寄生感应。
- 热管理：高能量浪涌后产生热量，必要时在 PCB 下方布设热铜或焊盘扩展以助散热。
- 浪涌能力评估：Ppp=200W@10/1000μs 对应短时吸收能量级（近似能量量级约 0.2J），对更大能量事件需并联更大能量吸收或采用级联保护方案。
- 回流焊工艺兼容 SOD-123FL；请参照厂家 datasheet 的推荐回流曲线与焊盘尺寸。
六、注意事项与可靠性
- 请以厂家 datasheet 为准来确认温度范围、热阻和具体测试条件。
- 对于汽车级或更高安规要求的场合，建议选用经过 AEC-Q101 或等效认证的器件。
- 长时间工作在 Vrwm 附近可能增加漏电与热应力，设计时应留有裕量。
七、结论
SMF18A 以其 18V 的驻留电压、较低的漏电流和良好的脉冲吸收能力，适合用于 12V 类电源和一般工业通信接口的瞬态保护。合理的 PCB 布局与热管理、结合系统级浪涌分析，可发挥该 TVS 的最佳保护效果。更多详细参数与典型曲线请参考 CJ 官方 datasheet。
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