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TWGMC 1SMA4745A Zener Diode 1SMA4745A
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- TWGMC 1SMA4745A
- Type
- TWGMC
- Minimum package
- 5000
Technical parameters
- Electronic Component
- TWGMC
- Electronic Component
- 1SMA4745A
- Electronic Component
- 1
- Package
- SMA
- Electronic Component
- Zener Diode
- Electronic Component
- 0.1g
- Electronic Component
- 1
- (Zzt)
- 16Ω
- Electronic Component
- BM0264756948
- Diode
- 1
- Current(Ir)
- 5uA@12V
- Power Dissipation(Pd)
- 1W
- Electronic Component
- 15.2V~17.1V
- Electronic Component
- 55℃~+150℃
- Electronic Component
- 5000
- Electronic Component
- 16V
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
1SMA4745A 产品概述
一、产品简介
1SMA4745A 为单只独立式稳压二极管（Zener），标称稳压值 16V，额定耗散功率 1W，封装为 SMA（表面贴装）。该器件由台湾迪嘉（TWGMC）品牌供应，适用于中低功率的参考/稳压和钳位场合，具有宽工作结温范围与可靠的反向漏电特性，便于与常见 SMT 工艺配套使用。
二、主要参数
- 稳压值（标称）：16V
- 稳压值（范围）：15.2V ～ 17.1V
- 反向电流 Ir：5µA @ 12V
- 动态阻抗 Zzt：16Ω
- 最大耗散功率 Pd：1W（注：需考虑散热与温度降额）
- 工作结温范围：-55℃ ～ +150℃
- 封装：SMA（表面贴装）
三、性能特点与优势
- 宽温度范围：可在-55℃至+150℃结温下工作，适合多种工业环境。
- 低漏电流：Ir 在 12V 下仅 5µA，适合对静态电流敏感的电路。
- 中等动态阻抗：Zzt 为 16Ω，能在中小电流范围内维持较稳定的电压输出，但在电流波动大时会产生较明显的电压变化。
- 标准化 SMA 封装：适合批量 SMT 贴装与自动化生产。
四、典型应用场景
- 直流电源的基准电压与辅助稳压（例如 12V~24V 电源的局部稳压）
- 电路保护与过压钳位
- 工业控制与仪表的参考源
- 消费类电子或嵌入式设备中对中等功率稳压的场合
五、使用建议与注意事项
- 限流设计：稳压二极管需与串联电阻配合使用以限制电流。计算公式：R = (Vin - Vz) / (Iz + IL)。例如 Vin = 24V，欲保持 Iz ≈ 5mA（无外部负载），R ≈ (24-16)/0.005 = 1.6kΩ；对应稳压管耗散 Pz ≈ Vz·Iz = 16V·5mA = 0.08W（远小于 1W）。如有外部负载，须把负载电流计入分流。
- 散热与降额：标称 Pd = 1W 是在推荐散热条件下的上限；在实际 PCB 上应通过增加铜箔面积或散热结构降低结温。高温时应按器件厂家给出的降额曲线处理，避免长期靠近 Tmax 工作。
- 电压精度考虑：由于 Zzt = 16Ω，电流变化会引起显著的电压摆动，若系统要求高精度参考，应搭配低噪放大或使用更低阻抗的参考源。
- 封装与焊接：SMA 封装适合常规回流焊，建议遵循 IPC/JEDEC 的焊接温度和时序规范以防损伤器件。
六、封装与订购信息
器件型号：1SMA4745A
品牌：TWGMC（台湾迪嘉）
封装：SMA（表面贴装）
建议在设计时参照制造商完整数据手册，获取更详尽的特性曲线、最大额定值和焊接规范，以确保在目标应用中的可靠性与性能。
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