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DOWO SMBJ400CA
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- DOWO SMBJ400CA
- Type
- DOWO
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- DOWO
- Electronic Component
- SMBJ400CA
- Electronic Component
- 1
- Package
- SMB(DO-214AA)
- Electronic Component
- Electronic Component
- Type
- TVS
- Electronic Component
- ESD and Surge Protection (TVS / ESD)
- Electronic Component
- 0.215g
- Electronic Component
- 1
- Electronic Component
- BM0264254684
- Operating Temperature
- 55℃~+150℃
- Voltage
- 648V
- Current(Ir)
- 1uA
- Voltage(VBR)
- 447V
- 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.
SMBJ400CA 产品概述
一、主要特性
SMBJ400CA 是东沃（DOWO）推出的一款双向（Bi-directional）瞬态电压抑制二极管（TVS），采用玻璃钝化芯片工艺，针对高压瞬态浪涌保护设计。主要参数如下：
- 反向截止电压 VRWM：400V（连续工作电压）
- 击穿电压 VBR：447V（典型）
- 钳位电压 Vc：648V（在峰值脉冲电流条件下）
- 峰值脉冲电流 Ipp：930mA（对应 Ppp）
- 峰值脉冲功率 Ppp：600W（波形 10/1000μs，重复率 0.01%）
- 反向泄漏电流 Ir：1μA（典型）
- 工作温度范围：-55℃ ~ +150℃
- 封装：SMB (DO-214AA)；符合 RoHS 标准
额外特性包括极快响应时间、低泄漏电流以及优良的钳位能力，适用于单向和双向保护需求（本型号为双向单元）。
二、典型应用场景
- 工业高压直流母线、逆变器、变频器及电机驱动器的输入/输出浪涌保护
- 三相/单相交流供电系统（保护整流桥及后级直流母线）
- 光伏并网逆变器、储能系统的直流侧保护
- 通信基站直流供电、配电箱、防雷及过压浪涌抑制
- LED 大功率驱动、电梯、伺服及工业自动化设备的过压防护
三、选型与使用注意
- 电压匹配：VRWM=400V 表明器件可在不触发导通的情况下长期承受最多 400V 的连续工作电压。用于交流 220VAC（峰值约 311V）或高压直流母线（≤400V）场合时须考虑安全余量和系统波动。
- 单向 vs 双向：双向器件在正负反向均可钳位，适合交流系统或有极性反复变化的场合；直流系统若对反向导通有更高要求可考虑单向型。
- 能量与寿命：Ppp=600W（10/1000μs）为瞬态峰值能力，重复脉冲占空比受限（0.01%）。若系统存在重复或长时间能量注入（如频繁雷击、持续浪涌），应评估能量与器件热耗并采用多级保护或限流元件。
- 钳位电压：648V 的钳位电压为峰值钳位，选择时需确认被保护电路能承受该瞬态电压。必要时在前端加入阻抗或吸收级以降低钳位需求。
四、封装与安装建议
SMB（DO-214AA）封装适中，便于手工焊接与自动贴装。为了获得最佳浪涌散热与性能：
- PCB 布局尽量缩短 TVS 到被保护线的导线长度，减小串联电感。
- 封装底部及周边采用宽铜箔，并在背面增加散热过孔（via）导入内/底层散热平面。
- 对于频繁冲击或高能量环境，考虑并联多个器件或串联与阻性元件分担能量。
- 遵循制造商的回流焊温度曲线，以免影响玻璃钝化芯片可靠性。
五、可靠性与合规
玻璃钝化工艺提高了器件的稳定性和抗击穿能力，低泄漏和宽温度范围（-55℃~+150℃）适应严苛工业环境。产品符合 RoHS 要求，适用于需要环保合规的工程项目。
如需进一步的典型曲线（I-V 特性、钳位曲线、热阻等）、封装图纸或样片支持，请联系供应商或索取完整数据手册以进行电路级验证与可靠性评估。
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