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BOURNS MF-SM185/33-2
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- BOURNS MF-SM185/33-2
- Type
- BOURNS
- Minimum package
- 1500
Technical parameters
- Electronic Component
- BOURNS
- Electronic Component
- MF-SM185/33-2
- Electronic Component
- 1
- Package
- SMD,9.5x6.7mm
- Electronic Component
- Resettable Fuse
- Electronic Component
- 0.851g
- Electronic Component
- 1
- Electronic Component
- BM0257417568
- Operating Temperature
- 40℃~+85℃
- Voltage Rating(Vmax)
- 33V
- Power(Pd)
- 1.9W
- Current(Imax)
- 40A
- Electronic Component
- 1500
- Latching Current(Ihold)
- 1.8A
- Current(Itrip)
- 3.6A
- (Rmin)
- 40mΩ
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
MF-SM185/33-2 产品概述
一、产品概述
MF-SM185/33-2 为 BOURNS 出品的片式可复位聚合物自恢复保险丝（PTC resettable fuse），适用于 PCB 表面贴装（SMT）应用。器件尺寸为 9.5 × 6.7 mm，设计用于对短路和过流事件提供快速动作保护，同时在故障解除后能自动恢复，便于提高系统可靠性并减少维修需求。
二、主要电气参数
- 额定保持电流（Ihold）：1.8 A
- 跳闸电流（Itrip）：3.6 A
- 最大电压耐受（Vmax）：33 V
- 最大浪涌电流（Imax）：40 A
- 功耗（Pd）：1.9 W
- 初始态阻值（Rmin）：40 mΩ
- 跳断后最大阻值（R1max）：150 mΩ
- 工作温度范围：-40 ℃ 至 +85 ℃
三、产品特性
- 自恢复：过流触发后电阻显著上升，限制电流并保护线路；故障解除并冷却后可自动回复低阻态。
- SMT 封装：适配自动化贴装与回流焊工艺，节省空间、便于大批量生产。
- 高浪涌能力：支持高达 40 A 的短时浪涌电流，适合含有启动电流或突发脉冲的负载。
- 宽温度范围：适应工业级温度环境，适用于多种工作场景。
四、典型应用
- 电源输入线、DC-DC 模块保护
- 电池保护与电池管理系统（BMS）前端保护
- 通信设备、路由器、电源适配器与充电器
- 消费类电子、工业控制与车载电子（符合温度要求时）
五、使用建议与注意事项
- 工作电流选择：长期工作电流应低于 Ihold（1.8 A），并留有裕量以避免在高环境温度或多次过载情况下误动。
- 考虑环境与散热：器件附近高温元件或受限通风会降低动作阈值，应留足铜箔和散热区以利散热。
- 对浪涌与启动电流的评估：如设备存在频繁或长时间的大幅启动电流，需确认不会触发热动作或考虑并联/其他保护方案。
- 跳断后特性：器件跳断后内阻可能上升至 150 mΩ（最大），恢复时间取决于冷却条件；若应用对低阻要求严格，建议检查并在必要时更换或采用其他保护措施。
- 焊接与处理：遵循厂商的 SMT 回流曲线与储存规范，避免超出推荐的回流温度与时间以保证器件性能与可靠性。
六、可靠性与合规
MF-SM185/33-2 以聚合物热敏材料为核心，通过封装与工艺控制实现可重复的动作与恢复特性。适配多数消费与工业类保护需求，但在特殊或关键安全系统中，建议与其他保护器件（如熔断器、过压保护等）配合使用以形成多重保护策略。
如需更详细的回流焊曲线、电流-温升曲线或过流动作时间数据，请参照 BOURNS 官方资料或联系供应商获取完整技术手册。
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