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BOURNS MF-R700
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
20
specifications
Core information
- Product name
- BOURNS MF-R700
- Type
- BOURNS
- Unit
- Electronic Component
- Minimum package
- 500 袋
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- BOURNS
- Electronic Component
- MF-R700
- Electronic Component
- 1
- Package
- Through-hole
- Electronic Component
- Resettable Fuse
- Electronic Component
- 0.493g
- Electronic Component
- 22.1mm
- Electronic Component
- 1
- Electronic Component
- 17.5s
- Electronic Component
- BM0264532945
- Operating Temperature
- 40℃~+85℃
- Voltage Rating(Vmax)
- 30V
- Power(Pd)
- 3.8W
- Current(Imax)
- 40A
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
MF-R700 产品概述
一、产品简介
MF-R700 是 BOURNS 出品的一款自恢复聚合物正温度系数（PTC）热敏保险丝，额定耐压 30V、保持电流 7A，适用于直流/低压电源与电路保护。器件为插件封装，长度 22.1mm，设计用于在过流或过热情况下迅速限制电流并在故障消除后自动恢复，适合对可维护性和可靠性有要求的消费电子、通讯及工业设备。
二、主要特性
- 额定耐压：30V DC，满足一般低压系统保护需求。
- 最大可承受瞬态电流：40A，能承受短时大电流冲击而不损坏。
- 保持电流 (Ihold)：7A，在正常工作时保持低温和低阻抗。
- 跳闸电流 (Itrip)：14A，超过该电流水平元件将进入高阻态以限制后续电流。
- 功耗 (Pd)：3.8W，为热量管理与外壳选型提供依据。
- 初始态阻值 (Rmin)：5mΩ，低压降有利于提高系统效率。
- 跳断后最大阻值 (R1max)：30mΩ，足以显著限制故障电流。
- 动作时间：17.5s（典型或测量工况），用于评估保护响应速度。
- 工作温度范围：-40℃ ～ +85℃，适应宽温环境。
三、工作原理与性能说明
MF-R700 属于自恢复型 PTC 热敏保险丝，常态下阻值很低（约 5mΩ），在电流超过 Itrip 或持续发热使元件温度上升时，材料快速增加电阻将电流限制到安全水平。故障移除后器件冷却、阻值恢复，恢复供电无需更换元件。动作时间受环境温度、散热条件和电流波形影响，17.5s 为典型条件下的参考值。
四、典型应用场景
- 电源输入保护：消费电子设备、机顶盒、路由器等。
- 电池保护与充电电路：小型锂电池组的过流保护。
- 通信与网络设备：供电模块、POE 辅助保护。
- 工业控制与传感器接口：电机驱动前的短路防护（短时冲击）。
五、选型与使用建议
- 确定系统正常工作电流应小于 Ihold（7A），并考虑电流浪涌与启动电流是否会触发保护。
- 若系统存在长时间的亚稳态过流，检查 Pd 与散热条件，避免器件长时间高温工作导致误动作。
- 对于需要更快响应或更低闭合阻抗的场合，可比较同系列不同型号或考虑与瞬态抑制器配合使用。
- 插件封装便于维修更换，板上布局应保证周围有足够散热空间并避免热源直接影响器件。
六、可靠性与保存
- 工作温度范围 -40℃ ~ +85℃，在极端温度下应验证动作电流的漂移。
- 储存时避免高温潮湿环境，长期暴露在强紫外或腐蚀性气体中会影响材料性能。
- 在设计中建议预留检测点或熔断指示方式以便维护和故障诊断。
以上为 MF-R700 的产品概述与选用参考。若需更详细的电流-时间特性曲线、环境测试报告或尺寸与引脚图纸，可进一步提供数据表（DATASHEET）以便做更精确的系统匹配与热仿真。
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