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MDD 1SMA4740A
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- MDD 1SMA4740A
- Type
- MDD
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- MDD
- Electronic Component
- 1SMA4740A
- Electronic Component
- 1
- Package
- SMA(DO-214AC)
- Electronic Component
- Zener Diode
- Electronic Component
- 0.094g
- Electronic Component
- 1
- (Zzt)
- 7Ω
- Electronic Component
- BM0257686021
- Diode
- 1
- Current(Ir)
- 10uA@7V
- Power Dissipation(Pd)
- 1W
- Electronic Component
- 9.5V~10.5V
- 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.
1SMA4740A 产品概述
一、产品简介
1SMA4740A 是 MDD 推出的独立式稳压二极管，采用 SMA (DO-214AC) 封装，主要用于反向击穿工作作为基准或稳压源。该器件额定稳压值为 10V（典型），允许稳压范围 9.5V～10.5V，适合中小功率的基准与保护场合。
二、主要参数
- 稳压值（标称）：10V
- 稳压值范围：9.5V～10.5V
- 反向漏电流 Ir：10µA @ 7V
- 动态阻抗 Zzt：7Ω（表示电压随电流变化的敏感度）
- 最大耗散功率 Pd：1W（器件结温及散热条件良好时）
- 工作结温范围：-55℃ ～ +150℃
- 封装：SMA (DO-214AC)，有显著阴极标记，便于识别极性
三、典型应用
- 线性或分流式稳压电路的基准源与箝位器
- 电源浪涌与过压保护（配合限流电阻）
- 仪表、电池管理与通信设备中的参考稳压
- 工业与汽车电子中对温度范围要求较高的场合
四、设计与使用要点
- 工作电流与限流：稳压时通过限流电阻 R 的电流 I = (Vin - Vz) / R。器件最大稳压耗散 Pd = Vz × Iz，应确保 Iz 不超过 Pd/Vz（≈100mA），通常建议在 5–20mA 范围内选择工作点以延长寿命并降低温升。
- 动态响应：Zzt=7Ω 意味着电流波动时稳压会有明显变化，要求较高精度参考时应并联低温度系数放大或采用稳压环路。
- 漏电与偏置：Ir=10µA @7V 表明在未达到稳压区前有小幅漏电，低电流环境下需考虑漏电引入的误差。
- 热管理：在 PCB 布局上增大铜箔散热面积，必要时串联电阻分担热耗散，避免结温长期接近上限。
- 焊接与存储：遵循制造商推荐的回流曲线与湿敏等级处理，避免过热和潮湿引起的可靠性问题。
五、封装与可靠性
SMA 封装兼具体积小、散热相对平衡的特点，便于表面贴装自动化生产。器件在-55℃～+150℃范围内可靠工作，适合工业级应用。选用时请参照 MDD 提供的完整数据手册进行批次与温度降额设计。
总结：1SMA4740A 以稳定的 10V 标称值、1W 的功耗能力和工业级温度范围，适用于需要简洁分流稳压或过压保护的中低功率电子系统。
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