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Jingdao Microelectronics 1SMAF4757A
Configuration
1 options
Configuration
24+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- Electronic 1SMAF4757A
- Type
- Jingdao Microelectronics
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic
- Electronic Component
- 1SMAF4757A
- Electronic Component
- 1
- Package
- SMAF
- Electronic Component
- Zener Diode
- Electronic Component
- 0.056g
- Electronic Component
- 1
- (Zzt)
- 95Ω
- Electronic Component
- BM0229356803
- Diode
- 1
- Current(Ir)
- 1uA
- Power Dissipation(Pd)
- 1W
- Electronic Component
- 48.6V~54V
- 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.
1SMAF4757A 产品概述
一、产品简介
1SMAF4757A 是晶导微电子推出的独立式稳压二极管，标称稳压值为 51V，实际稳压范围为 48.6V ~ 54V。器件在 38V 时的反向漏电流约为 1μA，耗散功率为 1W，直流/小信号阻抗 Zzt 为 95Ω。工作结温范围宽泛，为 -55℃ 至 +150℃，封装为 SMAF，适合表面贴装的小型化电路设计。
二、主要特性
- 标称稳压：51V，实际允差 48.6V~54V，适用于高电压基准或限压场合。
- 低漏电：在 38V 时 Ir ≈ 1μA，有利于降低待机功耗和提高静态精度。
- 中等动态阻抗：Zzt = 95Ω，表明在稳压区存在一定电压随电流变化的 slope，需要在精密场合考虑误差。
- 功率与温度：Pd = 1W，适用于低至中等功率稳压场景；结温耐受 -55℃~+150℃，可靠性良好。
- 封装：SMAF，体积小、便于批量贴装与热扩散设计。
三、典型应用
- 工业控制、通信设备中的高压参考与电平限制。
- 电源模块或整流后端的高压稳压与保护模块（低能量浪涌）。
- 仪器仪表与传感前端的高电压基准源。
- 电池管理或充放电保护中用于稳压基准或限制过电压（需配合限流元件）。
四、电气与热设计建议
- 稳压二极管作为并联式（分流）稳压器使用时，应通过限流电阻或恒流源限制通过二极管的电流 Iz，确保 Iz·Vz ≤ Pd。按标称值计算：Iz_max ≈ Pd / Vz = 1W / 51V ≈ 19.6mA。建议在设计中留足裕量并考虑环境升温后的降额。
- 由于 Zzt 较高，电流变化将带来可观的电压漂移，若需高稳定度参考，请在电路中加温度补偿或采用低阻抗并联滤波。
- 器件散热主要依赖 PCB 铜箔及焊盘面积，合理增加散热铜皮和通孔可显著提高持续功耗能力。
五、封装与焊接
SMAF 封装适合回流焊与自动贴装。焊接时遵循制造商推荐的回流温度曲线，避免超过器件最高结温并控制焊接热循环次数。为降低焊接应力，焊盘设计应配合封装并保证良好热扩散。
六、使用注意事项
- 该器件适合恒定或缓慢变化的稳压场合，不建议单独用于吸收大能量冲击（如雷击或大电流浪涌），若需抗冲击能力，应选用专用 TVS 或增加串联限流与缓冲。
- 注意静电防护与正确存储环境（避免潮湿、极端温度），装配时遵循 ESD 操作规范。
- 在高精度应用中应考虑器件的阻抗与温度系数对稳压精度的影响。
七、结论
1SMAF4757A 是一款面向高电压参考与限压应用的独立式稳压二极管，具有 51V 的标称稳压、低漏电和 1W 的耗散能力，适用于工业、通信和电源保护等场景。在电路采用中需合理控制工作电流、做好散热设计并注意其动态阻抗带来的电压漂移，以确保长期稳定可靠运行。
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