WMSIC Electronic Components

TECH PUBLIC SMF3.3CA

ModelSMF3.3CA
PackageSOD-123
BrandTECH PUBLIC
Price Price on request Electronic component prices change quickly with market supply and demand. Please refer to the latest WMSIC quotation for current pricing.
Configuration
1 options
Configuration 26+

Available for RFQ

Technical data

Product details

19 specifications

Core information

Product name
TECH PUBLIC SMF3.3CA
Type
TECH PUBLIC
Minimum package
3000 圆盘

Technical parameters

Electronic Component
Electronic Component
Electronic Component
TECH PUBLIC
Electronic Component
SMF3.3CA
Electronic Component
1
Package
SOD-123
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
50pF
Electronic Component
BM0226539044
Voltage
12V
Electronic Component
IEC 61000-4-4;IEC 61000-4-5;IEC 61000-4-2
Current(Ir)
200nA
Voltage(VBR)
4.7V

For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.

SMF3.3CA 产品概述

一、产品简介

SMF3.3CA 是 TECH PUBLIC(台舟电子)提供的一款单路双向瞬态电压抑制(TVS)二极管,专为低电压供电线路的浪涌和静电保护设计。器件在SOD-123封装中实现了小体积与高能量吸收能力的平衡,适用于消费电子、通信设备、工业控制等对瞬态抑制有要求的场合。

二、主要电气参数

  • 反向工作电压 Vrwm:3.3 V
  • 击穿电压 Vbr(最低/典型):4.7 V(参考)
  • 钳位电压 Vc:12 V(在典型冲击条件下)
  • 峰值脉冲功率 Ppp:450 W(8/20 μs 波形)
  • 峰值脉冲电流 Ipp:38 A(8/20 μs)
  • 反向漏电流 Ir:200 nA
  • 结电容 Cj:50 pF
  • 通道数:单路;极性:双向
  • 封装:SOD-123
  • 防护等级:满足 IEC 61000-4-2(ESD)、IEC 61000-4-4(EFT)、IEC 61000-4-5(浪涌)

三、关键特性

  • 双向结构:可同时抑制正负极性瞬态,适合交流或双向信号线保护。
  • 高能量吸收:450 W(8/20 μs)峰值能力,配合38 A峰值电流能有效钳制大能量冲击。
  • 低漏电流(200 nA):在休眠或低功耗应用中对电源影响小。
  • 中等结电容(约50 pF):对高频信号有一定影响,需在高速信号线使用时评估。
  • 小型SOD-123封装:利于面积受限的 PCB 布局与自动贴片生产。

四、典型应用

  • USB、串口、CAN 总线等接口的过电压/静电保护
  • 工业控制与传感器节点的输入保护
  • 通信设备与消费类电子的局部电源保护
  • 室外或易受雷击与浪涌干扰的电路防护点

五、封装与安装建议

  • 放置位置:尽量靠近被保护的接口或芯片电源引脚,缩短引线长度以提高抑制效果。
  • PCB 布局:保护器件到地的回流路径应尽量粗短、低阻;对双向器件,推荐对称布局。
  • 热管理:在频繁或高能量冲击场合,考虑散热与能量分担(并联多个器件或配合限流元件)。

六、选型与使用注意

  • 工作电压匹配:Vrwm=3.3 V 适用于 3.3 V 系统;若系统瞬态幅值或容忍电压不同,应选用相应额定 Vrwm。
  • 钳位能力评估:在预计冲击电流下确认钳位电压(典型 12 V)不会损伤被保护器件。
  • 结电容影响:若用于高速差分信号线(如高速 USB、以太网等),需确认 50 pF 不会影响信号完整性。
  • 不超额使用:切勿超过厂方给定的 Ppp 与 Ipp 限值,以免器件损坏并影响系统可靠性。

七、合规与可靠性

本器件符合 IEC 61000-4-2/4-4/4-5 等电磁兼容标准的防护要求,适合作为系统级瞬态抑制元件。实际系统设计中建议配合浪涌试验验证整机通过性,并根据需要采取多级防护方案(如前端限流、滤波、电源序列控制等)。

以上为 SMF3.3CA 的产品概述与实用建议。如需典型波形图、最大额定值表或封装尺寸图,可提供进一步数据表以便精确设计与验证。

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