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BHFUSE BSMD1812-300-8V BSMD1812
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- BHFUSE BSMD1812-300-8V
- Type
- BHFUSE
- Minimum package
- 1500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- BHFUSE
- Electronic Component
- BSMD1812-300-8V
- Electronic Component
- 1
- Electronic Component
- 3.41mm
- Package
- 1812
- Electronic Component
- Resettable Fuse
- Electronic Component
- 0.128g
- Electronic Component
- 4.73mm
- Electronic Component
- 1.5mm
- Electronic Component
- 1
- Electronic Component
- BM0231067992
- Operating Temperature
- 40℃~+85℃
- Voltage Rating(Vmax)
- 8V
- Power(Pd)
- 1.2W
- Current(Imax)
- 100A
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
BSMD1812-300-8V 产品概述
一、产品简介
BSMD1812-300-8V 是佰宏（BHFUSE）推出的一款贴片自恢复保险（PTC/热敏复位保险），封装规格为 1812（长 4.73mm × 宽 3.41mm × 高 1.5mm）。该器件专为低压电源线路的过流保护设计，具有低初始电阻、快速跳闸和可复位性能，适用于 USB、便携设备、电池保护与模块化电源分配等场景。
二、主要电气与机械参数
- 封装：1812（SMD）
- 品牌：BHFUSE（佰宏）
- 长度：4.73 mm；宽度：3.41 mm；高度：1.5 mm
- 初始态阻值 Rmin：10 mΩ（代表电路正常工作时的低压降）
- 跳断后阻值 R1max：50 mΩ（过流后恢复态稳态阻抗上限）
- 保持电流 Ihold：3 A（在该电流下不会触发跳闸）
- 跳闸电流 Itrip：6 A（典型触发电流）
- 最大浪涌/非连续电流 Imax：100 A（短时冲击电流能力，非长期连续值）
- 耐压 Vmax：8 V（器件最大允许工作电压）
- 工作温度：-40 ℃ 至 +85 ℃
- 最大功耗 Pd：1.2 W（与环境温度及散热条件相关）
三、性能特点与优势
- 低压降：初始态仅约 10 mΩ，减少系统损耗与发热，有利于高效率供电线设计。
- 快速保护：6 A 级别的跳闸电流能在过载/短路初期迅速限制电流，降低后续器件损坏风险。
- 可复位：故障消除后自动冷却恢复，可重复使用，降低维护成本。
- 封装易装配：1812 SMD 适合自动化焊接流程，节省空间、便于批量生产。
四、典型应用场景
- USB 及周边 5V 供电保护（需注意 Vmax=8V，适用于低压系统）
- 便携式设备和充电宝的输出防护
- 锂电池管理系统的过流保护（作为分路保护件）
- 工业/通信模块的模块化电源保护与备份线路保护
五、选型与使用建议
- 额定选择：建议 Ihold ≥ 常态工作电流 × 1.25，以避免在正常工作波动时误触发；同时保证 Itrip 明显高于工作峰值但低于受保护负载允许的危险范围。
- 电压限制：严禁在超过 8V 的系统中长期使用，超过耐压可能引起失效或安全风险。
- 环境与散热：Pd（1.2W）为最大耗散能力，环境温度升高会降低器件承载能力，必要时按厂商曲线进行温度—电流热降额。
- 短时浪涌：Imax=100A 表示短时冲击能力，不能作为连续使用电流参考。
- 焊接与可靠性：采用标准 SMT 回流工艺并参照厂方焊接曲线；避免长时间高温或潮湿存放。
六、结论与选型要点
BSMD1812-300-8V 适合需要低压降、可复位保护且工作电压 ≤8V 的低压电源线路。选型时重点关注保持电流与跳闸电流的匹配、环境温度对额定能力的影响以及短时浪涌能力。若需更详细的热阻曲线、时间—电流特性或回流焊参数，建议向佰宏索取完整的产品数据手册以做最终设计验证。
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