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CJ 1SMA4758A
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- CJ 1SMA4758A
- Type
- CJ
- Minimum package
- 5000 未知
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- CJ
- Electronic Component
- 1SMA4758A
- Electronic Component
- 1
- Package
- SMAG
- Electronic Component
- Zener Diode
- Electronic Component
- ±5%
- Electronic Component
- 0.108g
- Electronic Component
- 1
- (Zzk)
- 2kΩ
- (Zzt)
- 110Ω
- Electronic Component
- BM0230031797
- Diode
- 1
- Current(Ir)
- 100nA
- Power Dissipation(Pd)
- 1W
- Electronic Component
- 55℃~+150℃
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
1SMA4758A 产品概述
一、概述
1SMA4758A 是 CJ（江苏长电/长晶）提供的一款 56V 标称稳压二极管，封装为 SMAG，额定耗散功率 Pd 为 1W。该器件在反向击穿区工作，可作为高压稳压、基准与过压钳位元件使用，适用于需要中等功率吸收与低漏电流的电路场合。
二、主要电气参数
- 稳压值（标称）：56V
- 反向漏电流 Ir：100 nA（标注条件 42.6V）
- 耗散功率 Pd：1W（额定）
- 结阻抗 Zzt：110 Ω（表征在测试条件下的小信号阻抗）
- 结阻抗 Zzk：2 kΩ（表征在低电流或转折区的阻抗）
- 工作结温范围：-55 ℃ ~ +150 ℃
三、特性解读与应用建议
- 低漏电流：在 42.6V 时 Ir 仅 100 nA，适合对漏电严格要求的高阻抗电路或参考源场合。
- 动态阻抗：Zzt=110 Ω 表明在正常稳压工作点附近动态阻抗中等，若需高精度电压基准应考虑更低阻抗器件。Zzk 较高，提示在击穿转折区对电流变化敏感，启动点并不锋利。
- 功率与热管理：Pd 为 1W，适合低到中等能量吸收场合。长时间工作或承受脉冲能量时需注意热降额与散热设计，避免超过结温上限。
- 典型应用：高压稳压基准、电源二次侧过压保护、输入防浪涌/浪涌旁路、电路去耦与钳位（非高精度基准场合）。
四、设计与使用注意事项
- 工作在稳压区时必须通过串联限流（如电阻或恒流源）控制电流，确保器件耗散不超过 1W。
- 在高环境温度或有限散热条件下，应按厂商的功率-温度降额曲线使用，避免长期满载工作。
- 由于 Zzk 较大，器件在低电流条件下稳压特性不稳定，推荐在其规定的测试或推荐工作电流范围内使用以获得较为稳定的电压输出。
- 封装为 SMAG，实际 PCB 布局应注意热传导路径与焊盘尺寸，必要时采用铜箔过孔或散热面增强散热。
五、封装与选型建议
- 品牌与来源：CJ（江苏长电/长晶），适合寻求国产供应链与成本敏感设计的工程应用。
- 封装：SMAG，体积小，适合表面贴装自动化生产。选型时核对实际尺寸与焊盘库文件，保证组装兼容性。
- 选型提示：若电压精度或动态阻抗要求更高，可考虑低阻抗或高功率等级的稳压管；若用于瞬态抑制，应优先考虑专用 TVS 型器件。
总结：1SMA4758A 是一款适用于中高压、低漏电、1W 级耗散的稳压二极管，适合在需钳位或稳压但对精度要求不高的工业与通信等场景。设计时重视电流限流与热降额，将有助于器件长期稳定运行。
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