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DOWO SMA4747A
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- DOWO SMA4747A
- Type
- DOWO
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- DOWO
- Electronic Component
- SMA4747A
- Electronic Component
- 1
- Package
- SMA(DO-214AC)
- Electronic Component
- Zener Diode
- Electronic Component
- 0.123g
- Electronic Component
- 1
- (Zzk)
- 750Ω
- (Zzt)
- 22Ω
- Electronic Component
- BM0264548662
- Diode
- 1
- Current(Ir)
- [email protected]
- Power Dissipation(Pd)
- 1W
- Electronic Component
- 19V~21V
- Electronic Component
- 55℃~+150℃
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SMA4747A 产品概述
一、产品简介
SMA4747A 为 DOWO（东沃）出品的独立式稳压二极管，标称稳压值 20V，额定耗散功率 1W，采用 SMA（DO-214AC）表面贴装封装。器件针对中低功率稳压与浪涌限制应用设计，在体积与散热之间做了平衡，适合空间受限但需稳定参考电压或过压保护的场合。
二、主要电气参数
- 稳压值（标称）：20V（范围 19V ~ 21V）
- 最大耗散功率 Pd：1W（在适当散热条件下）
- 反向电流 Ir：100nA @ 15.2V（低电压下漏电小）
- 阻抗：Zzt = 22Ω（测试工况下的动态阻抗），Zzk = 750Ω（低电流弯角区阻抗）
- 工作结温范围：-55℃ ~ +150℃
- 二极管数：1 个独立式
三、结构与封装说明
SMA（DO-214AC）封装为常见的贴片功率二极管封装，便于自动贴装与回流焊接。该封装在 PCB 设计上需预留足够的铜箔散热区，以保证在接近 1W 功耗时结温可控。制造与焊接请参照 DO-214AC 标准工艺与厂家推荐的回流曲线。
四、电气特性与使用要点
- 最大连续电流：在稳压状态下，理论上 Imax = Pd / Vz ≈ 1W / 20V = 50mA。长期使用建议留有裕量，典型连续工作电流建议控制在 30mA 左右以延长寿命并降低结温。
- 动态阻抗影响稳压精度：Zzt = 22Ω 表明在测试电流下有中等压降随流变化；Zzk = 750Ω 表明在很小电流下稳压特性变差，需在合适的偏流范围内工作以获得良好稳压性能。
- 反向漏电小，适合低漏电要求电路，但注意 Ir 的测定电压为 15.2V，与标称 Vz 有所区别，应以厂家完整数据表为准。
五、典型应用场景
- 小功率线性稳压与参考电压源（配合限流电阻）
- 信号链或模拟电路的过压保护与钳位
- 工业与消费类电子中对中等精度 20V 稳压需求的辅助电源
- 浪涌吸收与电源瞬态钳位（非高能量抑制器件）
六、散热与可靠性建议
- 由于 Pd 为 1W，PCB 上应配置较大的散热铜箔或热垫，以降低结‑到‑环境热阻。
- 推荐在高温环境下做功率降额（derating），并保证结温不超过 +150℃。长期可靠性更佳的做法是把连续工作电流控制在额定最大值的 50%~70% 范围内。
- 回流焊接应遵从封装与厂方焊接规范，避免长时间高温暴露导致器件老化。
七、采购与识别
品牌：DOWO（东沃）；型号：SMA4747A；封装：SMA (DO-214AC)。采购时请索取完整数据手册以确认测试条件、典型特性曲线及可靠性试验数据，核对批次标识与质量保证条款，确保与设计假设一致。
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