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BHFUSE BSMD1812-020-30V BSMD1812
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- BHFUSE BSMD1812-020-30V
- Type
- BHFUSE
- Minimum package
- 1500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- BHFUSE
- Electronic Component
- BSMD1812-020-30V
- Electronic Component
- 1
- Electronic Component
- 3.41mm
- Package
- 1812
- Electronic Component
- Resettable Fuse
- Electronic Component
- 0.051g
- Electronic Component
- 4.73mm
- Electronic Component
- 1.1mm
- Electronic Component
- 1
- Electronic Component
- 40ms
- Electronic Component
- BM0229474031
- Operating Temperature
- 40℃~+85℃
- Voltage Rating(Vmax)
- 30V
- Power(Pd)
- 800mW
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
BSMD1812-020-30V 产品概述
一、产品简介
BSMD1812-020-30V 是佰宏（BHFUSE）生产的一款表面贴装自恢复保险（PPTC/自恢复型聚合物保险元件），封装规格为1812（长4.73mm×宽3.41mm×高1.1mm）。该器件用于电路过流保护，触发后电阻迅速增大以限制电流，故障解除后自动恢复原始低阻状态，适合多种消费电子与工业低压电源保护场景。
二、主要电气与机械参数
- 耐压 (Vmax)：30 V
- 最大电流 (Imax)：40 A（极限/短时能力，详见厂方曲线）
- 保持电流 (Ihold)：200 mA（在规定环境下不动作）
- 跳闸电流 (Itrip)：400 mA（典型动作阈值）
- 消耗功率 (Pd)：800 mW（用于热设计参考）
- 初始态阻值 (Rmin)：0.35 Ω
- 跳断后阻值 (R1max)：≤5 Ω
- 动作时间：40 ms（在规定超载条件下）
- 工作温度：-40 ℃ ~ +85 ℃
- 尺寸：4.73 × 3.41 × 1.10 mm，1812 封装
三、性能特点与工作原理
该器件在低电阻状态下允许正常工作电流通过；当电流超过 Itrip 时，器件内部温度上升，聚合物材料发生电阻增大，限制通过电流以保护下游电路。动作时间短（典型40ms），初始阻值低（Rmin=350mΩ）可减少功率损耗；跳断后阻值显著上升（R1max≤5Ω），有效降低故障电流。自恢复特性可在故障解除并冷却后恢复低阻态，适合重复保护需求。
四、典型应用场景
适用于各类低压电源保护，如 USB 供电接口、充电器与电源适配器、便携设备主供电、板级电源保护、通信设备与消费类电子。由于工作温度及额定电流特性，不建议在高温严苛的动力总成近发动机舱等极端环境长期使用，若用于汽车应确认车规级要求与温度裕量。
五、选型与使用建议
- 审核 Ihold 与 Itrip 是否匹配实际工作电流与短时浪涌；若存在较大浪涌（如启动电流），应考虑适当余量或并联设计，并参考厂方时间-电流特性曲线。
- Imax 标注为 40A，应视为极限/短时承受能力，长期连续大电流需谨慎。
- 布局时留意散热与周围器件热耦合，Pd=800mW 为热设计参考值；在高环境温度下需进行降额（derating）。
- 兼容标准回流焊工艺，但建议参考佰宏推荐的焊接温度曲线与预热参数，避免过热损伤。
- 设计时考虑触发后恢复时间与系统重连策略，必要时配合限流电路或监控逻辑共同保护。
如需更详细的时间-电流曲线、热阻模型或推荐PCB封装（Land Pattern），建议索取佰宏产品datasheet以获得完整规范与测试数据。
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