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ST SMBJ40A-TR SMBJ40A
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
20
specifications
Core information
- Product name
- ST(STMicroelectronics) SMBJ40A-TR
- Type
- ST
- Unit
- Electronic Component
- Minimum package
- 2500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- ST(STMicroelectronics)
- Electronic Component
- SMBJ40A-TR
- Electronic Component
- 1
- Package
- SMB(DO-214AA)
- Electronic Component
- Electronic Component
- Type
- TVS
- Electronic Component
- ESD and Surge Protection (TVS / ESD)
- Electronic Component
- 0.224g
- Electronic Component
- 1
- Electronic Component
- BM0228744804
- Operating Temperature
- 55℃~+150℃
- Voltage
- 64.5V
- Electronic Component
- IEC 61000-4-4；IEC 61000-4-5；IEC 61000-4-2
- Current(Ir)
- 1uA
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SMBJ40A-TR 产品概述
一、概述
SMBJ40A-TR 是意法半导体（ST）提供的一款单向瞬态抑制二极管（TVS），用于抑制静电放电（ESD）和浪涌（Surge）能量，保护敏感电子电路不被过压损坏。器件通过多项工业级抗扰度标准验证，适合工业控制、电源接口、通信端口等需要抗电磁脉冲与静电保护的场合。
二、关键参数
- 极性：单向（适用于直流保护）
- 反向截止电压 Vrwm：40 V
- 击穿电压 Vbr（典型）：44.4 V
- 钳位电压 Vc（在峰值脉冲时）：64.5 V
- 峰值脉冲电流 Ipp：9.7 A
- 峰值脉冲功率 Ppp：600 W
- 反向静态电流 Ir：1 μA（在 Vrwm 条件下）
- 工作温度范围：-55 ℃ ~ +150 ℃
- 防护等级/测试标准：符合 IEC 61000-4-2（ESD）、IEC 61000-4-4（EFT）、IEC 61000-4-5（Surge）
- 封装：SMB（DO-214AA）
- 包装形式：带卷盘（-TR 表示 Tape & Reel）
三、工作原理与极性说明
作为单向TVS，器件在正常工作时呈高阻状态（反向截止电流极小），当出现瞬态过压使电压超过击穿区域时，器件迅速导通，将浪涌能量钳位到安全电平（钳位电压约64.5 V），从而保护下游电路。单向结构用于直流或有确定极性的电路，封装外壳带有阴极标记，便于识别极性与安装方向。
四、封装与安装
SMB（DO-214AA）为常见的中功率表面贴装封装，适用于自动贴装与回流焊工艺。器件应靠近需保护的连接器或端口布置，缩短引线与回路面积以降低感抗，利于有效吸收并分散脉冲能量。
五、典型应用场景
- 电源输入与稳压电路的浪涌保护
- 通信接口（以太网、串口等）外部干扰防护（直流供电场景）
- 工业控制系统及仪器的ESD/EFT防护
- 配电模块、继电器驱动等含直流节点的瞬态抑制
六、布局与使用注意事项
- 将SMBJ40A-TR置于靠近外部接口或电缆入口处，焊盘到器件的铜箔尽量短且宽。
- 避免并联多个TVS以提高功率（并联容易因阈值差异导致不均流）。
- 不应把器件作为持续限压器件长期工作，峰值功率与峰值电流均为瞬态额定值，应遵循脉冲能量规范及制造商提供的浪涌循环能力。
- 工作电压应低于 Vrwm（40 V）；反向电流和发热需在系统热裕量内考虑，避免高温环境下热失控。
七、可靠性与采购建议
- 器件耐受工业级ESD/EFT/Surge标准，适合苛刻环境；工作温度覆盖-55 ℃ 到 +150 ℃。
- 订购时注意后缀“-TR”为带卷盘包装，便于SMT贴装。
- 若需更低钳位电压或更高反向耐压，可在ST产品家族中选择不同Vrwm等级或考虑双向TVS用于交流线路。
- 在关键设计中，建议参考ST官方数据手册和波形测试条件，以获得完整的脉冲特性与热限制信息。
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