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MDD 1SMA4739A
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- MDD 1SMA4739A
- Type
- MDD
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- MDD
- Electronic Component
- 1SMA4739A
- Electronic Component
- 1
- Package
- SMA(DO-214AC)
- Electronic Component
- Zener Diode
- Electronic Component
- 0.094g
- Electronic Component
- 1
- (Zzt)
- 5Ω
- Electronic Component
- BM0226436804
- Diode
- 1
- Current(Ir)
- 10uA
- Power Dissipation(Pd)
- 1W
- Electronic Component
- 8.6V~9.59V
- Electronic Component
- 55℃~+150℃
- 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.
1SMA4739A 产品概述
一、产品简介
1SMA4739A 为 MDD 品牌的独立式稳压二极管（Zener），以 SMA（DO-214AC）表面贴装封装提供。该器件工作稳压值标称为 9.1V，属于常用的低功耗基准/保护类稳压元件，适用于对体积、成本和可靠性有要求的整机设计中作为基准电压或过压钳位元件使用。
二、主要参数
- 稳压值（标称）：9.1V
- 稳压值（范围）：8.6V ~ 9.59V
- 反向电流 Ir：10 µA（测试条件：7V）
- 耗散功率 Pd：1 W（器件功耗能力，实际受 PCB 散热影响）
- 阻抗 Zzt：5 Ω（在指定测试电流下的动态阻抗）
- 工作结温范围 Tj：-55 ℃ ~ +150 ℃
- 封装：SMA（DO-214AC），独立式单只二极管
三、电气性能与热特性
1SMA4739A 在小电流至中等电流条件下提供较稳定的参考电压，低反向泄漏电流（10 µA@7V）有利于高阻抗电路中的电压基准精度。5 Ω 的阻抗表明在额定工作区间内动态响应较好，但仍需注意工作电流越大，稳压点会有一定偏移。额定耗散功率 1W 表示器件在无额外散热时能承受的最高耗散，设计时应考虑 PCB 面积、铜厚及散热路径以避免过热。
四、封装与可靠性
SMA 封装适合回流焊工艺与自动贴装，体积小、可靠性高，适合批量生产。-55 ℃ 至 +150 ℃ 的结温范围使其能够在较宽的工业温度环境下工作，适应性强。为保证长期可靠性，建议遵循厂方推荐的回流曲线与抗焊剂处理规范（具体参数以完整数据手册为准）。
五、典型应用场景
- 低功耗电压基准与参考源（小信号传感、模拟电路）
- 过压保护与电压钳位（接口电路、驱动电路）
- 电源管理中作旁路稳压元件（分压+稳压组合）
- 工业与消费电子中需要简易稳压或保护的场合
六、使用建议与注意事项
- 由于稳压精度受电流、电压和温度影响，设计时应选择合适的偏流电阻和工作电流点以获得所需稳压值与精度。
- Pd 为 1W，但实际允许功耗与 PCB 散热能力密切相关，长期高功耗工作需扩大铜箔面积或添加散热措施。
- 在高温或高耗散应用中，请关注结温上升并留安全余量，避免长期靠近 Tj 上限工作。
- 器件为反向工作（Zener）时方可得到稳压特性，正向导通时行为类似普通二极管（正向压降）。
七、选型与替代参考
当需要相近稳压值或更低动态阻抗、不同功耗等级时，可考虑同系列或其它厂商的 9.1V 稳压二极管，比较项包括：稳压容差、Zzt、最大耗散功率与工作结温。最终选型应以完整的器件数据手册和实际电路测试结果为准。
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