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Jingdao Microelectronics 1SMA4763A
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- Electronic 1SMA4763A
- Type
- Jingdao Microelectronics
- Minimum package
- 5000 编带
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic
- Electronic Component
- 1SMA4763A
- Electronic Component
- 1
- Package
- SMA
- Electronic Component
- Zener Diode
- Electronic Component
- 0.07g
- Electronic Component
- 20
- (Zzt)
- 250Ω
- Electronic Component
- BM0231087004
- Diode
- 1
- Current(Ir)
- 1uA@69V
- Power Dissipation(Pd)
- 1W
- Electronic Component
- 86V~96V
- 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.
1SMA4763A 产品概述
一、产品简介
1SMA4763A 为晶导微电子推出的独立式稳压二极管，标称稳压值 91V（公差范围 86V~96V），采用 SMA 表面贴装封装（DO-214AC）。器件设计用于高电压轨的稳压、钳位与浪涌保护等场合，适合做简单的分流稳压器或作为高压保护元件使用。
二、主要特性
- 稳压值（标称）：91V，稳压范围：86V ~ 96V。
- 低反向漏电流：Ir = 1 μA @ 69V（表征在高于一般低压工作点下的漏电性能）。
- 小信号阻抗（Zzt）：250 Ω（表明在测试电流下动态阻抗较大，不适合作为低噪声精密基准）。
- 最大耗散功率：Pd = 1W（在规定散热条件下）。
- 工作结温范围：-55 ℃ ~ +150 ℃。
- 封装：SMA，便于自动贴装和回流焊工艺。
三、电气参数与典型计算
- 最大稳流 Iz_max ≈ Pd / Vz = 1W / 91V ≈ 11 mA（此为理论上限，不包括环境温升和散热限制）。实际连续工作建议留有裕量，典型连续电流建议 ≤ 5–8 mA；长时间工作可采用更保守的电流限流以提高可靠性。
- 分流稳压时需串接限流电阻 R = (Vin - Vz) / Iz （实例：若 Vin = 200V，目标 Iz = 10 mA，则 R ≈ 10.9 kΩ，且二极管耗散功率约 0.91W，接近极限）。
- 由于 Zzt = 250 Ω，微小电流变化会引起较大电压摆幅，因此不建议用于对精度和噪声有严格要求的参考源。
四、封装与装配要点
SMA 封装尺寸小、散热依赖于焊盘和基板。注意事项：
- 引脚极性：SMA 上带有带号为阴极标识，装配时注意方向。
- 焊接工艺：推荐使用标准回流曲线（遵循元件温度限值），避免长时间高温暴露。
- 热管理：在高功耗或高环境温度下，应通过加大焊盘铜箔或改善散热路径来降低结温，必要时降低工作电流或采用外部散热元件。
五、典型应用场景
- 高压分流稳压：用于将较高的直流母线稳压到 ~91V 供给后级电路或偏置。
- 浪涌钳位与过压保护：用于保护高压侧不被尖峰电压击穿（配合能量吸收元件）。
- 高压偏置与测试电路：便于在空间受限的 SMD 板上实现可靠的高压参考或钳位功能。
六、选型与使用建议
- 若系统对电压精度、噪声或温漂有较高要求，请选择低阻抗、高精度的参考源而非本器件。
- 设计时严格计算最大耗散，并考虑环境温度、印制板热阻与可能的瞬态能量。对长期可靠性，建议对 Pd 进行适当的降额使用。
- 测试与检验：建议在目标应用电流下测量稳压值、动态阻抗与漏电流，验证封装焊接后的热响应。
- 储存与防静电：按常规半导体元件管理，避免潮湿、静电与超标机械应力。
总结：1SMA4763A 以其 91V 的高压稳压能力、SMA 表面贴装形式，适合用于工业类高压分路稳压与钳位保护场合。合理的电流限流与散热设计是保证稳定与可靠运行的关键。
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