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UMW SM03
Configuration
1 options
Configuration
Electronic Component
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- UMW SM03
- Type
- UMW
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- UMW
- Electronic Component
- SM03
- Electronic Component
- 1
- Package
- SOT-23
- Electronic Component
- Electronic Component
- Electronic Component
- ESD and Surge Protection (TVS / ESD)
- Electronic Component
- 0.032g
- Electronic Component
- 1
- Channel Count
- Electronic Component
- Cj- Capacitor
- 450pF
- Electronic Component
- BM0265664751
- Voltage
- 7V
- Electronic Component
- IEC 61000-4-4；IEC 61000-4-2
- Current(Ir)
- 20uA
- Voltage(VBR)
- 4V
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SM03 产品概述
一、核心参数与特点
SM03 是 UMW（友台半导体）推出的双向静电与浪涌保护二极管，封装为 SOT-23，单路设计，专为 3.3V 系统的瞬态抑制而优化。主要参数包括：反向截止电压 Vrwm = 3.3V，击穿电压 Vbr = 4V，钳位电压约 7V（在 8/20µs 测试条件下），峰值脉冲功率 Ppp = 350W（8/20µs），反向漏电流 Ir = 20µA，结电容 Cj = 450pF。器件为双向结构，无极性限制，能同时抑制正负极性瞬态。
二、电气性能与标准认证
SM03 对 ESD 与 EFT 等瞬态具有良好抑制能力，符合 IEC 61000-4-2 和 IEC 61000-4-4 标准，可用于抗静电放电和线路瞬态脉冲保护。高能量吸收能力（350W@8/20µs）保证在典型浪涌事件中将过压钳制在安全范围内，保护后端敏感器件不被击穿。需要注意，450pF 的结电容对高速差分信号可能存在影响，选用时应评估对信号完整性的影响。
三、适用场景与 PCB 布局建议
适合应用：3.3V 电源轨、串行接口（UART、RS-232 低速线路）、控制信号线、工业控制与消费类电子的 I/O 保护等。布局建议：器件应尽量靠近被保护端口放置，走线短且宽，避免与敏感信号平行走线；必要时在前端加入阻抗匹配或串联阻抗器件以改善系统稳定性与抑制反射；热散布需关注 SOT-23 的焊盘散热能力，采用过孔或加大铜箔提升功率耗散。
四、选型要点与替代考虑
选型时，请确认系统允许的钳位电压（7V 钳位在某些低压设备可能仍高）及结电容对信号速率的影响；若用于高速差分总线或对寄生电容敏感的接口，建议寻找低 Cj 型号或专用高速 ESD 保护器件。SM03 在中低速、空间受限场合提供成本与保护性能的平衡，是 3.3V 保护方案的实用选择。若需更高能量吸收或更低钳位电压，可与厂商技术支持沟通定制或查询同系列器件。
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