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DOWO SMF24A
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- DOWO SMF24A
- Type
- DOWO
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- DOWO
- Electronic Component
- SMF24A
- Electronic Component
- 1
- Package
- SOD-123
- Electronic Component
- Electronic Component
- Type
- TVS
- Electronic Component
- ESD and Surge Protection (TVS / ESD)
- Electronic Component
- 0.04g
- Electronic Component
- 1
- Electronic Component
- BM0231110365
- Voltage
- 38.9V
- Current(Ir)
- 1uA
- Voltage(VBR)
- 26.7V
- Electronic Component
- Electronic Component
- Electronic Component
- 3000
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SMF24A 产品概述
一、产品简介
SMF24A 是 DOWO（东沃）出品的一款单向瞬态电压抑制二极管（TVS），封装为 SOD-123。该器件专为抑制瞬态过电压和浪涌能量设计，适用于24V工作电压等级的直流电源保护和信号线防护，能够在瞬态冲击期间将线路电压钳位在可接受范围内，保护后端电路不受损伤。
二、主要参数与含义
- 极性：单向（unidirectional），常用于直流电源线，反向击穿后导通将浪涌电流引至地线。
- 反向工作电压 Vrwm：24V，建议在此电压以下长期工作。
- 击穿电压 Vbr：26.7V，器件进入限制区的起始电压。
- 钳位电压 Vc：38.9V（在8/20μs冲击下），表示在规定脉冲下被抑制时的最大电压峰值。
- 峰值脉冲电流 Ipp：5.14A（对应1kW @ 8/20μs 能量等级），表明可承受一次性浪涌电流幅值。
- 峰值脉冲功率 Ppp：1kW（8/20μs），行业标准浪涌试验波形下的吸收能力。
- 反向电流 Ir：1μA，低漏电流有利于在正常工作时减少静态功耗。
- 封装：SOD-123，体积小、适合表面贴装。
三、典型应用场景
- 24V 工业控制电源、PLC、继电器驱动电源保护；
- 通信接口与接口板的瞬态浪涌防护；
- 电池供电/备用电源系统的浪涌抑制；
- 小型设备的输入端防雷击或开关瞬态保护。
四、设计与布局建议
- 将 SMF24A 靠近受保护的连接器或电源入口安装，走线尽量短且宽，减小寄生电感。
- 接地应采用低阻抗的回流路径，必要时在接地处加大铜箔或设置多条过孔以提高散热和电流承载能力。
- SOD-123 为小封装，瞬态能量集中在小面积，若频繁遭受高能量冲击，应选用更大封装（如 SMA/SMB）或并联多只器件。
- 推荐遵循厂家的回流焊温度曲线，避免长时间高温回流导致器件性能劣化。
五、使用注意事项与可靠性
- SMF24A 针对脉冲能量吸收而设计，不适合作为稳态电流承载元件；在非瞬态情况下不能长期承受大功率。
- 多次大能量冲击会降低器件寿命或造成参数漂移，设计时应评估最大可能冲击次数与能量。
- 钳位电压为测试条件下的典型值，实际系统中受温度、并联电阻、回路阻抗影响，可能有所上升。
- 在高温、高湿或强腐蚀环境应做好封装防护与可靠性验证。
六、选型与替代建议
若需更高浪涌吸收能力或更低钳位电压，可选用更大功率规格或低钳位型号；若保护双向交流信号或差分线，则需选择双向 TVS。SOD-123 封装适合空间受限且冲击能量中等的应用，功率需求显著增加时考虑 SMB/SMA 等更大封装。
总结：SMF24A（DOWO，SOD-123）以其24V 工作等级、1kW@8/20μs 能量吸收和低漏电流特性，适合用于24V 直流供电及相关接口的瞬态浪涌保护。合理的版图布局与热管理能显著提升保护效果与可靠性。
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