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Littelfuse SMD075F/60-2 SMD075F
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- Littelfuse SMD075F / 60-2
- Type
- LITTELFUSE
- Minimum package
- 2000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- LITTELFUSE
- Electronic Component
- SMD075F/60-2
- Electronic Component
- 1
- Package
- SMD-2
- Electronic Component
- Resettable Fuse
- Electronic Component
- 0.43g
- Electronic Component
- 1
- Electronic Component
- 800ms
- Electronic Component
- BM0258853354
- Voltage Rating(Vmax)
- 60V
- Power(Pd)
- 1.7W
- Current(Imax)
- 10A
- Electronic Component
- Electronic Component
- Electronic Component
- 2000
- Latching Current(Ihold)
- 750mA
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SMD075F/60-2（Littelfuse PolySwitch）产品概述
一、产品简介
SMD075F/60-2 为 Littelfuse SMD 系列的可复位聚合物自恢复保险丝（PolySwitch），封装为 SMD-2，额定耐压 60V。器件在过流或短路情况下通过正温度系数（PTC）效应迅速增阻限流，故障消除后冷却恢复导通，适合表面贴装的保护方案，广泛应用于便携设备、通信接口、电源输入及电池保护等场景。
二、主要参数（主要规格一览）
- 最大工作电压（Vmax）：60V
- 最大允许电流（Imax）：10A（冲击能力）
- 保持电流（Ihold）：0.75A（750mA）——在此电流及以下器件长期保持闭合状态
- 跳闸电流（Itrip）：1.5A —— 在此电流条件下器件在规定时间内进入高阻态
- 功耗（Pd）：1.7W（器件最大耗散功率，注意热管理）
- 初始态阻值（Rmin）：350 mΩ（初态低阻，影响电压降与功耗）
- 跳断后阻值（R1max）：1Ω（高阻态限流性能）
- 动作时间：約 800ms（从过流到进入高阻态的典型时间）
三、工作原理与行为特性
PolySwitch 以导电聚合物为核心，当通过器件的电流超过器件的热触发点时，内部温度上升导致电阻迅速增大，从而限制电流并降低系统损伤。降温后材料恢复原有低阻态，实现自动复位。器件的 Ihold 与 Itrip 由温度与电流相互作用决定，实际动作受环境温度、PCB 散热与重复冲击影响。
四、应用建议与选型要点
- 按实际工作电流选择：工作电流应显著低于 Ihold，留有余量以避免误动作。
- 注意冲击能力：Imax=10A 表示能承受瞬态冲击，但不等同于长期过流容量。
- 考虑电压降与功耗：在 0.75A 条件下，典型压降约 0.26V（0.75A×0.35Ω），在设计电源效率与热预算时需计算。
- 热环境与散热：Pd=1.7W 为器件能耗上限，应通过 PCB 铜箔、散热路径与布置降低结温，避免因环境高温降低 Itrip。
五、封装与安装要点
- 封装 SMD-2，适合自动贴装与回流焊；焊接时应遵循厂商推荐回流曲线以保证可靠性。
- 布局建议提供充足的铜箔散热区，避免将热源集中在器件附近。器件冷却不良会导致动作电流下降、误跳频率上升。
- 严禁用导线或锡桥替代复位保险丝，发生保护动作后需排查原因并确认系统无短路再复位。
六、典型应用场景
- USB / I/O 接口过流保护
- 电池组与充电线路短路保护
- 电源输入与局部供电分支保护
- 通信设备、移动设备、便携式电源防护
七、可靠性与维护
器件为可复位保护元件，频繁过流会影响寿命与触发特性。建议在设计中保留足够的裕量，出现反复跳闸应查明根本原因并修复故障点。长期存放与高温环境会改变特性，装配与使用时遵从厂方规格书可获得最佳性能与可靠性。
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