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Jingdao Microelectronics 1SMA4739A
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- Electronic 1SMA4739A
- Type
- Jingdao Microelectronics
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic
- Electronic Component
- 1SMA4739A
- Electronic Component
- 1
- Package
- SMA
- Electronic Component
- Zener Diode
- Electronic Component
- 0.12g
- Electronic Component
- 1
- (Zzt)
- 5Ω
- Electronic Component
- BM0230856406
- Diode
- 1
- Current(Ir)
- 10uA@7V
- 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 是晶导微电子推出的一款小功率稳压二极管，采用 SMA 表面贴装封装（DO‑214AC 型式兼容），为独立式稳压二极管设计。其标称稳压值为 9.1V，适用于需要中低功率稳压、参考电压或瞬态钳位的场合。
二、主要技术参数
- 稳压值（标称）：9.1V
- 稳压值范围：8.6V ～ 9.59V（相当于约 ±5% 公差等级）
- 反向电流 Ir：10 μA @ 7V
- 耗散功率 Pd：1W（在额定环境与散热条件下）
- 动态阻抗 Zzt：5 Ω（在厂家规定的测试电流下测得）
- 工作结温范围：-55 ℃ ～ +150 ℃
- 封装：SMA（表贴，便于自动化贴装与回流焊）
三、产品特点
- 体积小、适于表面贴装，便于大批量自动化生产；
- 额定耗散功率 1W，可满足一般信号级和小功率电源稳压需求；
- 稳压公差较小（约 ±5%），适合作为固定参考电压源或保护元件；
- 低漏电流特性（Ir 10 μA@7V），在低电流应用中能够维持较好的稳压精度；
- 宽工作结温范围，适应工业级环境要求。
四、典型应用场景
- 小功率电源的稳压与参考电路；
- 过压或反向电压的钳位保护；
- 开关电源的辅助稳压与启动电路；
- 通信设备、仪器仪表、工业控制与消费电子的低功耗稳压模块；
- 浪涌及瞬态抑制（需评估实际能量承受能力）。
五、使用与设计建议
- 在 PCB 设计中，应为 SMA 封装预留适当的焊盘与过孔，以改善散热性能；如需长期在接近额定 Pd 下工作，建议增大铜箔面积或设计散热槽以降低结‑至‑环境热阻；
- 设计时考虑功率降额：环境温度升高时需按器件热特性对最大耗散功率进行降额使用；
- 测量稳压值时应参考厂方给定的测试电流与条件，以获得一致性数据；
- 对于高精度参考，应在工作点选择合适的偏置电流并加上滤波/缓冲电路以降低噪声与温漂影响。
六、存储、焊接与可靠性
- 采用常规表贴元件的防潮干燥包装与储存措施；回流焊应遵循元件的最高允许回流温度规范（建议参照 JEDEC 标准与厂方推荐曲线）；
- 器件为半导体敏感元件，装配与测试时应注意静电防护；
- 大批量使用前建议进行样件测试，包括温度循环、功率老化与电气参数一致性检查。
七、选型与采购
1SMA4739A（晶导微电子，SMA 封装）适合需 9.1V 固定稳压或钳位的中小功率应用。具体电性能曲线、测试条件及封装尺寸请参照晶导微电子官方数据手册或向供应商索取样片与技术支持，以便在系统中完成准确的热设计与电气匹配。
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