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ST 1N4731APF Zener diode 1N4731APF
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- ST 1N4731APF
- Type
- ST
- Minimum package
- 250 袋
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- ST
- Electronic Component
- 1N4731APF
- Electronic Component
- 1
- Package
- DO-41
- Electronic Component
- Zener Diode
- Electronic Component
- 0.223g
- Electronic Component
- 1
- (Zzk)
- 400Ω
- (Zzt)
- 9Ω
- Electronic Component
- BM0259564329
- Diode
- 1
- Current(Ir)
- 50uA@1V
- Power Dissipation(Pd)
- 1W
- Electronic Component
- 4.09V~4.52V
- 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.
1N4731APF 产品概述
一. 概要介绍
1N4731APF 是一款额定耗散功率为 1W 的硅稳压二极管，标称稳压值 4.3V，属低压齐纳（Zener）器件，常用于局部稳压、过压保护和参考电压源。品牌为 ST（先科），封装为常见塑料轴向 DO-41，便于穿孔板和波峰焊装配。
二. 主要电气参数
- 稳压值（标称）：4.3V
- 稳压值范围：4.09V ～ 4.52V（表征器件容差与工艺变动）
- 反向电流 Ir：50 μA @ 1V（低电压下的漏电特性）
- 耗散功率 Pd：1W（器件在规定冷却条件下的最大耗散）
- 动态阻抗 Zzt：9 Ω（在测量点/测试电流附近，对应稳压下的交流等效内阻）
- 跃降阻抗 Zzk：400 Ω（在击穿开始区域，低电流下电压随电流变化剧烈时的阻抗）
三. 性能解读与工程含义
- 稳压精度：4.09–4.52V 的范围表示典型器件在指定测试条件下允许的偏差，设计时应按最坏情况选用（例如按 4.09V 或 4.52V 计算电路容差）。
- 动态阻抗影响负载响应：Zzt=9Ω 意味着当工作电流变化时，稳压点会有 ΔV ≈ 9Ω × ΔI 的变化，若负载电流波动较大需考虑更大的滤波或缓冲。
- 打开区域（Knee）特性：Zzk 高达 400Ω 表明在极低电流下（接近击穿起始）电压对电流非常敏感，若电路常在微安级工作，稳压特性不稳定，应提高工作电流到设备规定的测量点附近。
四. 热管理与工作电流估算
理论上最大电流可由 Pd / Vz 估算：Imax ≈ 1W / 4.3V ≈ 232 mA。但这是在理想散热条件下的理论值，实际连续工作必须有余量并考虑结温限制与散热条件。建议：
- 使用限流电阻或恒流源限制流经齐纳的电流，避免长时间接近 Pd 极限。
- 在较高环境温度或密集布板场合进行功率降额（一般建议 50% 以内的安全工作功率）。
- 对于脉冲或瞬态浪涌，可参考器件脉冲能力并保证平均功率不超过 Pd。
五. 典型应用场景
- 小功率参考电压源：在传感器或模拟电路中为放大器或比较器提供稳定参考电压。
- 过压保护：与串联限流电阻配合，保护低压侧电路免受瞬态过压。
- 电平钳位与浪涌吸收：在信号线或电源线上限制峰值电压。
六. 使用建议与注意事项
- 若需要更好的稳压精度，可并联通过小电容进行滤波，或使用稳压芯片替代。
- 避免在击穿拐点附近长期工作（极低电流区），应保证工作电流在器件测试利于稳压特性的范围内。
- 焊接时注意封装热敏性，避免长时间过热影响器件特性。
- 对关键应用建议评估器件的温漂、长期稳定性以及在目标温度范围内的参数变化。
以上为 1N4731APF 的产品概述与工程使用建议，适用于快速选型与电路设计前的性能评估。若需典型曲线、测试电流点或更详细的热阻与最大反向电压数据，可参考原厂完整规格书以获得准确的工程数据。
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