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Littelfuse SMF70A
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
20
specifications
Core information
- Product name
- Littelfuse SMF70A
- Type
- LITTELFUSE
- Unit
- Electronic Component
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- LITTELFUSE
- Electronic Component
- SMF70A
- Electronic Component
- 1
- Package
- SOD-123F
- Electronic Component
- Electronic Component
- Type
- TVS
- Electronic Component
- ESD and Surge Protection (TVS / ESD)
- Electronic Component
- 0.037g
- Electronic Component
- 1
- Electronic Component
- BM0058414325
- Operating Temperature
- 65℃~+150℃
- Voltage
- 113V
- Electronic Component
- IEC 61000-4-4；IEC 61000-4-2
- Current(Ir)
- 1uA
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SMF70A 产品概述
一、概述与关键参数
SMF70A 是 Littelfuse 出品的单向瞬态抑制二极管（TVS），封装为 SOD-123F，专为瞬态过压保护设计。主要参数包括：反向工作电压 Vrwm = 70 V，击穿电压 VBR ≈ 77.8 V，钳位电压 Vc ≈ 113 V（在 1.5 A 峰值脉冲时）；峰值脉冲电流 Ipp = 1.5 A，峰值脉冲功率 Ppp = 200 W（10/1000 μs 波形）；反向漏电流 Ir ≤ 1 μA；工作温度范围 -65 ℃ 至 +150 ℃。器件符合 IEC 61000-4-2（ESD）和 IEC 61000-4-4（EFT）防护等级，适合多种电源及接插件瞬态防护场景。
二、主要特点与优势
- 单向结构，适用于直流电源线上对地的单向钳位保护；正向导通时表现为普通二极管，反向时在击穿电压附近迅速钳位。
- 高脉冲功率（200 W@10/1000 μs）适合吸收短时雷击或开关瞬态能量。
- 低漏电流（≤1 μA）有利于高阻电路或需低待机损耗的系统。
- 宽温度范围与工业级耐受性能，适应恶劣工作环境。
- 紧凑的 SOD-123F 封装，便于表面贴装与自动化生产。
三、典型应用场景
- 工业控制与电源模块直流供电线路保护
- 通信设备电源输入和接口保护
- 消费电子和便携设备的充电/电源接口防护
- 适配器、电源管理与接口板的瞬态抑制
四、使用建议与注意事项
- 布局：器件应贴近需要保护的输入端或连接器，走线尽量短且宽，减少环路电感以提高钳位效率。
- 散热：SOD-123F 为小型封装，瞬态能量吸收受限；遇到更高能量需求可并联多个器件或选用更大封装。避免超过 10/1000 μs 规范外的长时间冲击。
- 极性识别：单向 TVS 在封装上有阴极标记（带状一端），必须按照电路中线与地的正确极性焊接。
- 系统配合：在有持续浪涌或高能量条件下，建议配合限流电阻、熔断器或浪涌抑制器使用，以延长寿命并保护下游器件。
- 储存与可靠性：遵循常规 SMD 贴片器件的存储与回流焊工艺，温度限制与湿敏等级按供应商数据页执行。
五、选型与替代注意
选择时以工作电压 Vrwm 与系统运行电压匹配为首要原则：Vrwm 应高于正常工作电压以避免常态触发，同时保留足够的钳位余量保护下游器件。若需更高能量吸收或双向保护，可选择更大功率或双向（Bi-directional）型号。使用替代器件时注意比较 VBR、Vc、Ppp、Ipp、Ir 与封装及温度规格，确保兼容性。
总结：SMF70A 在 70 V 档位上提供紧凑、可靠的瞬态浪涌保护，适合工业与通信类电源输入和接口防护场景。正确的 PCB 布局和系统配合能发挥其最佳保护效果。
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