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Jingdao Microelectronics SMF18A
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- Electronic SMF18A
- Type
- Jingdao Microelectronics
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic
- 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
- 0.032g
- Electronic Component
- 1
- Electronic Component
- BM0228061678
- Operating Temperature
- 55℃~+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.
SMF18A（18V）TVS二极管 产品概述
一、产品简介
SMF18A 是晶导微电子推出的一款单向瞬态电压抑制（TVS）二极管，采用 SOD-123FL 小封装，专为保护电子系统免受直流和脉冲过压（如雷击、电感性开关或静电放电）损害而设计。其稳健的浪涌吸收能力与宽工作温度范围，使其适用于工业、通信及汽车等恶劣环境下的电源与信号保护。
二、主要参数
- 类型：单向 TVS 二极管（SMF18A）
- 反向截止电压 Vrwm：18 V
- 击穿电压 Vbr（典型）：22.1 V
- 钳位电压 Vc（Ipp 时）：29.2 V
- 峰值脉冲功率 Ppp：200 W（10/1000 μs）
- 峰值脉冲电流 Ipp：7.2 A（10/1000 μs）
- 反向电流 Ir（Vrwm 下）：1 μA（典型）
- 极性：单向
- 工作温度：-55 ℃ ～ +150 ℃
- 封装：SOD-123FL（表面贴装）
三、主要特性与优势
- 高能量吸收：在 10/1000 μs 波形下可承受 200 W 峰值脉冲功率，适合长时间宽脉冲浪涌防护。
- 低钳位电压：在最大允许脉冲电流下 Vc≈29.2 V，能够有效限制被保护节点电压，减少后端器件应力。
- 低漏电流：Vrwm 下漏电仅约 1 μA，有利于低功耗系统和精密测量应用。
- 宽温度范围：-55～+150 ℃，满足工业级及部分汽车级工作温度要求。
- 小型封装：SOD-123FL 占板面积小，适合空间受限的应用，且焊接工艺成熟。
四、典型应用场景
- 通信设备的电源线与信号线保护（如以太网、串口、USB 接口等）。
- 工业控制与仪器的直流供电防雷击与浪涌保护。
- 汽车电气系统的瞬态过压防护（需确认车规认证后使用）。
- 消费电子设备的进线端保护与整机 EMC 设计配合。
五、设计与布局建议
- 放置位置：尽量靠近被保护端口或电源输入端放置，缩短走线，减小寄生电感。
- 接地：对单向器件，负极应直接接地平面或参考地，确保浪涌能量能快速导出。
- 热管理：在高能量吸收场合，外围铜箔与散热设计有助于分散热量，避免封装过热。
- 串联元件：必要时可与熔断器、限流电阻或滤波元件配合使用，提高整体抗浪涌能力。
六、选型要点与可靠性建议
- 选型时 Vrwm 应略高于系统正常工作电压以避免误触发（如 12 V 系统可考虑 18 V Vrwm 视裕度而定）。
- 比对钳位电压与后端器件耐压，确保在最大浪涌下保护元件能将电压控制在被保护器件允许范围内。
- 对关键或高可靠性场合，参考制造商的脉冲寿命、热循环与机械可靠性数据，并配合加速寿命验证。
七、封装与采购信息
- 封装：SOD-123FL，常见的自动贴片焊接兼容。
- 品牌：晶导微电子（Jingdao Microelectronics）。
产品型号：SMF18A（18V）。在采购与替换时，请核对完整型号和器件批次，以保证器件参数一致性和可靠性。
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