WMSIC Electronic Components

DOWO SMAJ3.3A

ModelSMAJ3.3A
PackageSMA
BrandDOWO
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
DOWO SMAJ3.3A
Type
DOWO
Minimum package
5000 圆盘

Technical parameters

Electronic Component
Electronic Component
Electronic Component
DOWO
Electronic Component
SMAJ3.3A
Electronic Component
1
Package
SMA
Electronic Component
Electronic Component
Type
TVS
Electronic Component
ESD and Surge Protection (TVS / ESD)
Electronic Component
0.124g
Electronic Component
1
Electronic Component
BM0258760029
Operating Temperature
55℃~+150℃
Voltage
8V
Current(Ir)
600uA
Voltage(VBR)
6.5V
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.

SMAJ3.3A 产品概述

一、产品简介

SMAJ3.3A 是东沃(DOWO)推出的一款单向(unidirectional)瞬态电压抑制二极管(TVS),封装为常见的 SMA 体积。该器件专为保护 3.3V 供电与信号线免受感性负载释放、雷击或电源浪涌等瞬态过电压干扰而设计,兼顾高能量吸收能力与中等钳位电压,适用于通信、工业控制、汽车电子与消费类电子等场景。

二、主要电气参数

  • 极性:单向
  • 反向工作电压 Vrwm:3.3V(用于标称 3.3V 系统)
  • 击穿电压 Vbr:6.5V
  • 钳位电压 Vc:8V(在规定脉冲条件下)
  • 峰值脉冲电流 Ipp:43.8A @ 10/1000μs
  • 峰值脉冲功率 Ppp:400W @ 10/1000μs
  • 反向漏电流 Ir:600μA(在 Vrwm 下)
  • 工作温度范围:-55℃ ~ +150℃
    这些参数表明器件在 10/1000μs 浪涌测试波形下能吸收较大的能量并把峰值电压钳制在可接受范围内。

三、产品特点与优势

  • 针对 3.3V 系统优化的 Vrwm,配合较低的钳位电压(8V)可有效保护敏感芯片免遭过压损害。
  • 单向结构使其在正向瞬态(常见于电源升高或浪涌)时响应迅速,反向状态下表现为普通反向偏置。
  • SMA 封装便于表面贴装(SMT)自动化生产,散热及机械强度良好。
  • 宽温工作范围适应工业与汽车级环境。

四、典型应用场景

  • 3.3V 电源防护(PCB 主电源入口、局部供电点)
  • I/O 口、串行接口(UART、SPI)、数据总线防护
  • 通信设备、路由器、交换机的端口保护
  • 工业控制设备、仪表、传感器节点的浪涌抑制
  • 车辆电子的局部浪涌保护(非主要高功率车规件)

五、设计与使用注意事项

  • 安装时将器件的阴极(标记端)接向被保护线路,阳极接地(单向器件);确保接地回路短而粗以降低串联电感。
  • 评估实际浪涌能量并与 Ipp/Ppp 规格对比,必要时并联多个器件或选用更高能量等级的 TVS。
  • 反向漏电流 600μA 在电池供电或低功耗设计中需考虑其对待机功耗的影响。
  • PCB 布线应尽量缩短从受保护节点到 TVS 的引线,使用足够的铜厚与热铜块以利散热。
  • 采用符合封装的回流焊温度曲线,避免过热导致性能退化。

六、存储与可靠性

  • 建议在干燥、常温环境中保存,避免长期潮湿与强氧化气体。
  • 工作温度范围宽,可在严苛环境长期可靠运行,但在高温应用下应关注功耗与散热条件。
  • 对于关键系统建议在实际应用中进行浪涌试验验证器件选择与布局效果。

总结:SMAJ3.3A 是一款为 3.3V 系统设计的高能量、钳位电压合理的单向 TVS,适合多种工业与消费类应用。合理的 PCB 布局与热管理能充分发挥其浪涌吸收能力,提升系统抗干扰与可靠性。

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