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Jingdao Microelectronics SMAJ18CA
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- Electronic SMAJ18CA
- Type
- Jingdao Microelectronics
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic
- Electronic Component
- SMAJ18CA
- Electronic Component
- 1
- Package
- SMA
- Electronic Component
- Electronic Component
- Type
- TVS
- Electronic Component
- ESD and Surge Protection (TVS / ESD)
- Electronic Component
- 0.12g
- Electronic Component
- 1
- Electronic Component
- BM0259749305
- Operating Temperature
- 65℃~+150℃
- Voltage
- 29.2V
- Current(Ir)
- 1uA
- Voltage(VBR)
- 22.1V
- 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.
SMAJ18CA XT（SMA 封装）产品概述
一、产品简介
SMAJ18CA 是晶导微电子推出的一款双向瞬态抑制二极管（TVS），采用 SMA（DO-214AC）表面贴装封装，针对脉冲浪涌提供快速、可靠的钳制保护。器件设计用于在电源线或信号线上吸收瞬态能量，防止下游器件遭受过压损坏。典型应用包括工业电源、通信接口、汽车电子（耐高温环境下）以及其它需要浪涌防护的场合。
二、主要技术参数
- 极性：双向
- 反向截止电压（Vrwm）：18 V
- 击穿电压（Vbr）：22.1 V
- 钳位电压（Vc）：29.2 V（在指定脉冲条件下）
- 峰值脉冲电流（Ipp）：13.7 A @ 10/1000 μs 波形
- 峰值脉冲功率（Ppp）：400 W @ 10/1000 μs
- 反向电流（Ir）：1 μA（典型/最大值，按数据表条件）
- 工作温度范围：-65 ℃ ~ +150 ℃
- 封装：SMA (DO-214AC)
- 类型：TVS 二极管
三、性能与工作原理
作为双向 TVS，SMAJ18CA 在正负极性瞬态下均能导通，将突入的能量钳制至安全电平。工作时，当线路电压超过 Vrwm（18 V）时器件进入雪崩区，击穿电压约为 22.1 V；在标准 10/1000 μs 冲击波形下，钳位电压约为 29.2 V，对下游器件提供有效保护。器件额定的 Ppp=400 W 与 Ipp=13.7 A 表明其对中等能量脉冲（如感性负载断开、雷击诱发浪涌等）具有良好吸收能力。
四、封装与安装建议
SMA（DO-214AC）封装便于自动贴装与回流焊接，适合批量生产。推荐将 TVS 尽量靠近受保护器件或接口放置，以降低走线寄生电感，提升响应速度。焊接时遵循元件的回流温度曲线，避免长时间高温暴露以保护可靠性。
五、典型应用场景
- 工业控制电源、继电器驱动保护
- 通信设备的以太网/串口接口防护（双向脉冲）
- 汽车电子总线及电源（高温环境适用）
- 家电及消费电子的浪涌保护模块
六、设计与使用注意事项
- 选型时确认工作电压及最大允许钳位电压：钳位电压 29.2 V 在系统可承受范围内才能保证下游安全。
- 对于连续或频繁脉冲需评估平均功耗与热耗散，必要时加入串联电阻或外部熔断器配合使用。
- PCB 布局应缩短 TVS 引线长度，并增大散热铜箔以利于热量扩散。
- 双向器件适用于可能出现反向电压的线路；若仅正向保护，建议选用单向 TVS 以获得更低钳位电压。
七、可靠性与采购
SMAJ18CA 工作温度范围宽（-65 ℃ ~ +150 ℃），适合严苛环境应用。采购及批量使用前建议参阅晶导微电子提供的完整数据手册，确认器件的典型曲线、最大等级与封装标识，并结合实际系统做浪涌试验验证。若需样品、封装图或焊接参数，请向生产商或代理商索取详细资料。
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