Model & package intelligence
Model text, package form, tray or reel details, and visual evidence are reviewed together before RFQ feedback.
BOURNS MF-R040
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
20
specifications
Core information
- Product name
- BOURNS MF-R040
- 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-R040
- Electronic Component
- 1
- Package
- Through-hole, P=5.1mm
- Electronic Component
- Resettable Fuse
- Electronic Component
- 0.493g
- Electronic Component
- 1
- Electronic Component
- 3.8s
- Electronic Component
- BM0257202361
- Operating Temperature
- 40℃~+85℃
- Voltage Rating(Vmax)
- 60V
- Power(Pd)
- 550mW
- 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-R040 产品概述
一、产品简介
MF-R040 为 BOURNS 出品的一款自恢复 PTC 过流保护器件（RESET FUSE），额定耐压 60V，保持电流 400mA，适用于需要可复位过流保护的中低压直流及小功率交流电路。器件为插件式封装，针脚间距 P=5.1mm，便于手工焊接与波峰/回流工艺后的穿孔安装。
二、主要参数
- 耐压（Vmax）：60V
- 最大电流（Imax）：40A（短时通过能力）
- 保持电流（Ihold）：400mA（在额定环境温度下长期通过不会跳闸）
- 跳闸电流（Itrip）：800mA（典型跳闸起始值）
- 功耗（Pd）：550mW
- 初始态阻值（Rmin）：0.52Ω（520mΩ）
- 跳断后阻值（R1max）：1.29Ω
- 动作时间：3.8s（达到跳闸条件时的典型响应时间）
- 工作温度：-40℃ ~ +85℃
- 封装：插件，P=5.1mm
- 品牌：BOURNS，型号：MF-R040
三、产品特性
- 自动复位：过流后在故障消除并冷却后自动恢复导通，无需更换。
- 大短时通过能力：支持高达 40A 的短时浪涌电流，适合含有启动冲击的负载。
- 稳定可靠：初始阻值与跳断后阻值范围明确，便于设计时计算电压降与功耗。
- 宽温度范围：-40℃ 至 +85℃，适用于工业级环境。
四、应用场景
- USB/外设供电保护与过流防护
- 电源适配器、开关电源的输出侧保护
- 电池组与充电电路短路保护
- 通信设备与消费电子产品的局部电路保护
- 电机驱动控制电路的辅助保护
五、选型与使用建议
- 常态工作电流应低于 Ihold，峰值或短时浪涌可由 Imax 承受；若设备常有较长时间的过流，应选用更高 Ihold 的型号。
- 计算电压降时注意采用 Rmin（初始）与跳断后 R1max 的区分，评估跳闸时对系统余压的影响。
- 安装时保证充分的热散布空间，避免器件长期处于高温环境导致漂移或误动作。
- 焊接时遵循厂家温度曲线，避免过热影响器件特性。
六、注意事项
- 虽为自恢复元件，但频繁或长期过流会影响其寿命与阻值稳定性，必要时应检查并替换。
- 在安全关键或不可容忍误动作的场合，建议与一次性保险丝或电子限流电路配合使用。
MF-R040 提供简单可靠的自恢复过流保护，适合对重复操作性与维护友好性有要求的中低功率电路。
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