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Littelfuse SMAJ51CA
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
20
specifications
Core information
- Product name
- Littelfuse SMAJ51CA
- Type
- LITTELFUSE
- Unit
- Electronic Component
- Minimum package
- 5000
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- LITTELFUSE
- Electronic Component
- SMAJ51CA
- Electronic Component
- 1
- Package
- DO-214AC(SMA)
- Electronic Component
- Electronic Component
- Type
- TVS
- Electronic Component
- ESD and Surge Protection (TVS / ESD)
- Electronic Component
- 0.124g
- Electronic Component
- 1
- Electronic Component
- BM0226986442
- Operating Temperature
- 65℃~+150℃
- Voltage
- 82.4V
- Electronic Component
- IEC 61000-4-4；IEC 61000-4-2
- Current(Ir)
- 1uA
- Voltage(VBR)
- 62.7V
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SMAJ51CA 产品概述
一、产品简介
SMAJ51CA 为 Littelfuse（美国力特）SMAJ 系列双向表面贴装瞬态抑制二极管（TVS）。封装为 DO-214AC（SMA），适用于保护双向电源或信号线上出现的过压、雷击和静电放电（ESD）等瞬态事件。本器件静态功耗为约 3.3 W，脉冲承受能力强，适合工业、通信及电源防护场合。
二、关键电气参数
- 反向截止电压 Vrwm：51 V（工作耐受电压）
- 击穿电压（典型）: 62.7 V
- 钳位电压（Ipp 下）：82.4 V
- 峰值脉冲功率 Ppp：400 W @ 10/1000 µs
- 峰值脉冲电流 Ipp：4.9 A @ 10/1000 µs
- 反向静态漏电流 Ir：1 µA（典型）
- 极性：双向（可在两极间对称限制电压）
- 工作温度范围：-65 ℃ ~ +150 ℃
三、性能与合规
SMAJ51CA 针对快速瞬态和静电放电有良好抑制能力，满足并有利于通过 IEC 61000-4-2（静电放电，ESD）和 IEC 61000-4-4（电快速瞬变，EFT）等电磁兼容测试要求。钳位电压 82.4 V 在 Ipp 条件下能将能量限制在保护器件和被保护电路可承受范围内；低漏电流（约 1 µA）保证在正常工作时对电源不会产生明显负载。
四、典型应用场景
- 48 V 直流电源总线、PoE（以太网供电）过压保护
- 通信接口、电源输入端的浪涌与雷击防护
- 工业控制、仪表与测试设备的瞬态浪涌保护
- 需要双向限压（极性不确定或交流信号）的保护位置
五、选型与布局建议
- 选型：Vrwm（51 V）应高于线路正常最大工作电压，确保平时不触发；若系统电压接近或超过此值，应选择更高 Vrwm 的型号。
- PCB 布局：将 TVS 靠近被保护端口放置，焊盘短且粗，减小引线电感；若板上有滤波电容，尽量将 TVS 与电容并联靠近输入端。
- 散热与可靠性：在高能量脉冲环境下考虑额外散热措施或并联多个 TVS 以分担能量。
- 焊接与储存：遵循 DO-214AC 的回流焊工艺规范及厂商的 SMD 焊接曲线，避免超过推荐温度时间累计。
六、总结
SMAJ51CA 以 Littelfuse 的工艺和标准质量提供稳定的双向瞬态保护，适合用于中等能量浪涌场合，尤其适配 48 V 类系统与需要双向保护的应用。其低漏电、宽温度范围和符合 IEC ESD/EFT 要求的特点，使其在工业与通信领域具有良好的实用价值。若需在更高能量或不同工作电压环境中使用，请根据系统具体电压和能量等级选择相应型号或咨询厂商技术支持。
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