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BOURNS MF-R500
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
20
specifications
Core information
- Product name
- BOURNS MF-R500
- 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-R500
- Electronic Component
- 1
- Package
- Through-hole
- Electronic Component
- Resettable Fuse
- Electronic Component
- 0.493g
- Electronic Component
- 1
- Electronic Component
- 14.5s
- Electronic Component
- BM0257202366
- Operating Temperature
- 40℃~+85℃
- Voltage Rating(Vmax)
- 30V
- Power(Pd)
- 3W
- Current(Imax)
- 40A
- Electronic Component
- Electronic Component
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
MF-R500 产品概述
一、产品简介
MF-R500 为 BOURNS 出品的插件型可恢复自恢复保险（PTC Reset Fuse），用于直流低压电路的过流保护。其主要参数：耐压 30V、最大短时承受电流 40A、保持电流 Ihold 5A、跳闸电流 Itrip 10A，动作时间 14.5s，常温下初始阻值约 10mΩ，跳断后阻值上限 50mΩ，额定功耗 Pd 3W，工作温度范围 -40℃ 至 +85℃。该器件在过流时自动变高阻以限制电流，故障消除后可恢复原状，适用于需要重复保护和维护方便的场合。
二、主要电气特性
- 耐压（Vmax）：30V，适合常见的 5V、12V、24V 低压系统。
- 最大电流（Imax）：40A，指短时脉冲或瞬态条件下的承受能力，但不作为长期工作电流。
- 保持电流（Ihold）：5A，表示在规定温度下可长期通过而不会触发的最大电流。
- 跳闸电流（Itrip）：10A，表示器件在过流条件下将在一定时间内进入高阻态的判定门槛。
- 初始态阻值（Rmin）：约 10mΩ；跳断后阻值（R1max）：≤50mΩ，跳断仍保持较低电压降但能有效限制电流。
- 动作时间：14.5s（在特定过流条件下的典型动作时间，实际时间受环境温度和电路散热影响）。
- 功耗（Pd）：3W（器件在特定工况下的允许耗散能力，需注意热管理）。
三、典型应用场景
- USB、外设与通信设备的端口过流保护
- 电池包或便携设备的短路/过流保护
- 车载低压电源系统（符合 30V 耐压范围）
- 工业控制设备、记录仪及各类消费电子内部保护
四、布局与使用建议
- 将 MF-R500 放置在靠近需保护电源输入端的位置，以缩短无保护导线长度，降低故障电流路径。
- 保护周围应保持良好散热条件，避免与发热器件紧密并列；在高工作温度下，保持电流能力会下降，应适当留有裕量。
- 选型原则：长期正常工作电流应低于 Ihold（建议留 20% 以上裕量），同时故障电流应能被器件以不损坏方式限制在安全范围内。
- 插件封装适合波峰焊或手工焊接，焊接工艺和温度曲线请参照厂商资料，避免过长时间高温暴露导致性能退化。
五、可靠性与安全注意
- MF-R500 设计用于重复跳闸/自恢复场景，但频繁在极端条件下触发会影响寿命和恢复阻值，系统应尽量消除持续故障源。
- 在可能存在高能短路或极端环境（超出工作温度或耐压）的场合，建议与熔断器或电子限流器等多级保护组合使用。
- 具体电流-时间特性、热阻和循环寿命请以 BOURNS 的详细技术规格书为准，并在量产前进行系统级验证。
六、封装与订购信息
- 品牌：BOURNS
- 型号：MF-R500
- 封装：插件（Through-hole）
- 在选型和采购前，请对照厂商完整数据手册确认所有热、电特性与测试条件，必要时咨询技术支持以保证系统兼容与可靠性。
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