Model & package intelligence
Model text, package form, tray or reel details, and visual evidence are reviewed together before RFQ feedback.
DOWO SMBJ3.3A
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- DOWO SMBJ3.3A
- Type
- DOWO
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- DOWO
- Electronic Component
- SMBJ3.3A
- Electronic Component
- 1
- Package
- SMB(DO-214AA)
- Electronic Component
- Electronic Component
- Type
- TVS
- Electronic Component
- ESD and Surge Protection (TVS / ESD)
- Electronic Component
- 0.19g
- Electronic Component
- 1
- Electronic Component
- BM0230041542
- Voltage
- 8V
- Current(Ir)
- 600uA
- Voltage(VBR)
- 5.2V
- Electronic Component
- Electronic Component
- Electronic Component
- 3000
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SMBJ3.3A 产品概述
一、产品简介
SMBJ3.3A 是东沃（DOWO）推出的一款面向工业级瞬态抑制的单向 TVS（二极管）器件，封装为 SMB（DO-214AA）。器件用于对静电放电、开关瞬态和雷击脉冲等瞬时过压进行快速钳位，保护下游敏感电路，尤其适合 3.3V 信号/电源保护场景。
二、主要参数
- 类型：单向 TVS（ESD/浪涌抑制二极管）
- 标称稳压（Vrwm）：3.3V
- 击穿电压 VBR(min)：5.2V
- 钳位电压 VC：8V（在 IPP=76.9A 时）
- 峰值脉冲功率 Ppp（8/20μs）：600W
- 峰值脉冲电流 Ipp：100A（器件标称）；基于 Ppp/VC 计算的典型 Ipp ≈ 76.9A
- 反向漏电流 Ir：≈600 μA（在 Vrwm 条件下）
- 极性：单向
- 封装：SMB (DO-214AA)
- 品牌：DOWO（东沃）
三、性能特点
- 快速响应：可在纳秒级响应瞬态突变，迅速将电压钳位到安全水平，保护后端器件。
- 高能量吸收能力：600W（8/20μs）能量处理能力，适合常见的浪涌事件和较强的静电放电冲击。
- 单向结构：适用于有明确极性的直流或数据信号线路，钳位更准确、正向压降低。
- SMB 封装：体积小、可重复焊接，便于自动化贴装与大电流散热。
四、典型应用场景
- 3.3V 电源总线和信号线保护（MCU、FPGA、ASIC 等）
- 接口保护：USB、HDMI、UART、I2C 等数据线防护（需按极性选择）
- 工业控制、通信设备、车载电子（非安全关键路径）中的瞬态浪涌抑制
五、使用与布板建议
- 布局：尽量缩短保护器件到被保护端的走线，走线阻抗和回流路径应最短，减小钳位电压上升。
- 焊接：SMB 支持回流焊工艺，遵循厂商的温度曲线以避免热损伤。
- 散热与并联：在高能量或重复脉冲场景下，应考虑充分散热与必要时并联多只器件，但并联需做好电流分配。
- 极性注意：单向器件正向行为与普通二极管相似，接线时确保与系统极性一致。
六、可靠性与注意事项
- 反向漏电 Ir 在 3.3V 工作电压下约为 600 μA，敏感低功耗电路应评估漏电影响。
- 钳位电压随脉冲电流上升而变化，实际钳位电压以系统测试为准。
- 对于严格的标准合规（如 IEC 抗 ESD、雷击规范），建议在样机上进行真实波形（8/20μs、10/700μs、IEC 61000-4-2 等）测试验证。
总结：SMBJ3.3A 提供面向 3.3V 系统的一体化瞬态保护方案，具有高能量吸收与快速钳位能力，适用于工业与通信等多种应用场景。在实际设计中，关注 PCB 布局与热管理可显著提升保护效果与器件寿命。
Request for quote
Send RFQ
Use the form for single models, category sourcing, and multi-line BOM requirements.
Product sourcing intelligence
Model, package, availability, and BOM fit reviewed before quotation.
WMSIC turns product data, package visuals, BOM context, and sourcing signals into practical RFQ notes for buyers.
BOM matching & alternatives
BOM lines are compared by package, parameters, quantity, and workable alternatives for cleaner sourcing decisions.
Sourcing availability signal
Stock routes, quotation confidence, lead-time notes, and shipment feasibility are checked before sales follow-up.
Buyer sourcing scenarios
Examples of how common component sourcing requests are organized.
Typical RFQ scenarios based on the WMSIC form fields, catalog data, manual review steps, and shipment preparation workflow.
The buyer shares the full part number, package requirement, quantity, destination, and available product photos so the quotation can record the exact version under review.
A multi-line BOM is organized into direct sourcing lines, lines that need package clarification, and lines where alternative-part review is permitted.
The original manufacturer part number, datasheet revision, application, critical limits, and acceptable changes are collected before possible candidates are discussed.
Sample quantity, minimum packing, package format, target date, and courier destination are kept together in one RFQ conversation.
Package photos, model markings, board context, and the quantity needed for repair help focus the sourcing review on the relevant version.
When a suffix or package note is incomplete, the response records the open difference and requests buyer confirmation before procurement proceeds.
Packing format, carton notes, invoice details, courier option, destination, and tracking handoff are coordinated around the confirmed order.
The request connects the previously used model, current demand, package evidence, target timing, and replenishment sourcing route.
Related products
Packaged components ready for RFQ.
