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Jingdao Microelectronics 1SMA4751A
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- Electronic 1SMA4751A
- Type
- Jingdao Microelectronics
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic
- Electronic Component
- 1SMA4751A
- Electronic Component
- 1
- Package
- SMA
- Electronic Component
- Zener Diode
- Electronic Component
- 0.062g
- Electronic Component
- 1
- (Zzt)
- 40Ω
- Electronic Component
- BM0230630719
- Diode
- 1
- Current(Ir)
- 5uA@23V
- Power Dissipation(Pd)
- 1W
- Electronic Component
- 28.2V~32V
- 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.
1SMA4751A 产品概述
一、产品简介
1SMA4751A 是晶导微电子出品的独立式稳压二极管，标称稳压值30V（允许范围28.2V～32V），采用SMA封装。该器件为低功耗、高可靠性的稳压元件，适用于电压基准、过压保护和小功率稳压场合。封装紧凑，便于表面贴装，实现空间受限电路的稳压设计。
二、主要电气参数
- 标称稳压值（VZ）：30V（范围 28.2V ～ 32V）
- 反向漏电流（IR）：5µA @ 23V
- 阻抗（Zzt）：40Ω（典型测试条件下）
- 最大耗散功率（Pd）：1W（在规定的散热条件下）
- 工作结温范围：-55℃ ～ +150℃
- 封装：SMA（适合回流焊工艺）
三、主要特性与优势
- 电压精度适中：30V 标称电压适合中高电平参考和保护应用，允许一定偏差以适应工况。
- 低漏电流：在23V时典型反向电流仅5µA，有利于低功耗电路和精密测量场合。
- 低动态阻抗：Zzt=40Ω 提供较稳定的稳压性能，动态负载下电压波动受限。
- 宽温度范围与可靠性：-55℃～+150℃的结温范围确保在严苛环境下长期稳定工作。
- SMA 封装：良好的机械强度和可焊性，便于自动贴装与批量生产。
四、典型应用
- 作为恒压基准或分压回路的稳压元件，用于电源次级稳压或基准电压生成。
- 过压保护：在电源与敏感部件之间作为简单的钳位器件，限制电压突变。
- 仪表与传感器电路：用于要求低漏电流和稳定参考电压的测量系统。
- 工业控制、通信设备和消费电子中对中等功率稳压、保护的场合。
五、封装、热管理与安装建议
SMA（DO-214AC）封装提供较好的焊接可靠性与机械支撑。由于最大耗散功率为1W，实际应用需考虑功率分配与PCB散热设计：
- 在规划稳压电流与串联限流电阻时，确保 (Vin - Vz) × Iz ≤ Pd。
- 在高环境温度或连续工作时，应适当降额使用，并扩大铜箔散热面积以降低结温。
- 推荐采用回流焊流程并遵循厂商的焊接温度曲线，避免过热导致器件应力或失效。
六、选型与可靠性注意事项
- 计算稳压功耗并留有安全裕量，若电路可能出现瞬态大电流或高能量冲击，考虑并联更高功耗的保护器件或使用专用TVS。
- 注意反向漏电流随温度上升而增加，对精密低电流设计需验证在最高工作温度下的漏电影响。
- 选型时参考器件在特定测试电流下的稳压曲线与阻抗指标，确认满足电路动态负载要求。
- 采购时确认晶导微电子的批次、可靠性认证与包装形式（卷带、托盘等），以便生产与质量追溯。
综上，1SMA4751A 以其30V 的稳压特性、低漏电流与紧凑SMA封装，适合需要中高电压参考与过压保护的各类电子设备，对空间受限且要求可靠性的应用尤为合适。
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