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DOWO SMB5938B
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- DOWO SMB5938B
- Type
- DOWO
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- DOWO
- Electronic Component
- SMB5938B
- Electronic Component
- 1
- Package
- SMB
- Electronic Component
- Zener Diode
- Electronic Component
- ±5%
- Electronic Component
- 0.213g
- Electronic Component
- 1
- (Zzk)
- 1kΩ
- (Zzt)
- 22Ω
- Electronic Component
- BM0264866277
- Diode
- 1
- Current(Ir)
- [email protected]
- Power Dissipation(Pd)
- 3W
- 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.
SMB5938B 产品概述
一、产品简介
SMB5938B 是 DOWO（东沃）推出的一款独立式稳压二极管，额定稳压 36V，封装为 SMB（表面贴装 DO-214AA 类型），适用于需要稳压、基准或浪涌钳位的电路。器件为单只二极管（1 个独立式），以稳定可靠的电气特性和适用的功耗能力面向工业与消费类电子设计。
二、主要性能参数
- 稳压值：36V（典型名义值）
- 精度：±5%
- 反向漏电流 Ir：500 nA @ 27.4V（低漏电特性，有利于高阻抗和低功耗应用）
- 耗散功率 Pd：3W（在适当散热条件下）
- 阻抗 Zzt：22 Ω（稳态动态阻抗，有助于评估纹波抑制能力）
- 阻抗 Zzk：1 kΩ（击穿弯曲区阻抗，影响起始导通特性）
- 工作结温范围：-55 ℃ ～ +150 ℃（宽温区可靠工作）
三、关键特性与优势
- 低漏电：Ir 在 27.4V 下仅 500 nA，适合电池供电及超低功耗系统。
- 中等功耗能力：3W 功耗允许在合理散热条件下直接作为并联稳压元件使用，简化电源设计。
- 宽温区与工业级可靠性：-55℃~+150℃ 的结温范围适应恶劣环境与工业级应用。
- SMB 封装：适合自动贴装与波峰/回流焊工艺，兼顾体积与散热性能。
四、典型应用场景
- 开关电源或线性预稳压并联稳压参考
- 电池管理与便携设备的高压参考或钳位保护
- 工业控制与汽车电子（在符合系统热设计前提下）
- 浪涌抑制与输入保护电路
五、封装与热管理
SMB（DO-214AA）封装提供较好的机械强度与焊接兼容性。3W 耗散功率需结合 PCB 铜箔面积与散热方案评估实际工作点：建议在高功耗或高环境温度场合配合热沉或加大散热铜箔以降低结温，保证长期可靠性。
六、选型与使用建议
- 若系统对稳压精度要求严格，请考虑 ±5% 的偏差并留有裕量，必要时采用外部精密参考或后级精密稳压。
- 在低电流或待机模式下，器件的低漏电特性能减少静态功耗。
- 计算并联稳压的功耗时，应估算最大压降与流过的电流以验证 Pd 是否满足；在高温环境应考虑结温限制。
- 注意 Zzk 较高（1 kΩ）意味着在接近击穿点时曲线陡峭度有限，针对瞬态响应可做仿真验证。
七、采购与替代
型号：SMB5938B，品牌：DOWO（东沃），封装：SMB。选型时可与同类稳压二极管对比动态阻抗、漏电和温度规格以确定最优替代件。购买或工程样片需求建议向授权分销商或厂商技术支持咨询以获取完整数据表与可靠性报告。
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