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BHFUSE BSMD2920-300-33V BSMD2920
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- BHFUSE BSMD2920-300-33V
- Type
- BHFUSE
- Minimum package
- 1500 编带
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- BHFUSE
- Electronic Component
- BSMD2920-300-33V
- Electronic Component
- 1
- Electronic Component
- 5.44mm
- Package
- 2920
- Electronic Component
- Resettable Fuse
- Electronic Component
- 0.173g
- Electronic Component
- 7.98mm
- Electronic Component
- 1.6mm
- Electronic Component
- 1
- Electronic Component
- 20s
- Electronic Component
- BM0227636332
- Operating Temperature
- 40℃~+85℃
- Voltage Rating(Vmax)
- 33V
- Power(Pd)
- 1.8W
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
BSMD2920-300-33V 产品概述
一、产品简介
BSMD2920-300-33V 是佰宏（BHFUSE）出品的一款表面贴装型PTC自恢复保险丝（型号：2920封装）。器件耐压最高33V，设计用于中低电压线路的过流和短路保护，结构紧凑（7.98mm × 5.44mm × 1.6mm），便于在空间受限的应用中实现可靠保护。
二、主要电气参数
- 最高耐压（Vmax）：33V
- 最大允许电流（Imax）：40A
- 保持电流（Ihold）：3A（常温下在规定条件下不动作）
- 跳闸电流（Itrip）：6A（在20秒动作测试条件下）
- 功耗（Pd）：1.8W（参考热功耗能力）
- 初始电阻（Rmin）：12mΩ
- 跳断后最大电阻（R1max）：48mΩ
- 动作时间：20s（用于表征在标准测试条件下的动作点）
- 工作温度范围：-40℃ ~ +85℃
三、产品特性与优势
- 自恢复：在过流消除后可自动恢复导通，无需更换，降低维护成本。
- 低初始阻值：12mΩ起，适合对压降敏感的电源路径，最大限度减少正常工作损耗。
- 大电流承受能力：瞬态和容许电流高达40A，适合具有较大启动涌流或短时过载的场景。
- 宽温度范围：适用于工业级环境和汽车电子等更苛刻温度条件（需结合实际工况校核）。
四、典型应用场景
- 手机/平板/笔记本充电器及USB供电线路保护。
- 电池管理和电池组支路保护（便携式电源、移动电源）。
- 工业控制模块、通讯设备电源保护。
- 马达驱动、继电器线圈和有大启动电流的负载保护。
- 汽车电子辅助电路（需按汽车认证要求核实）。
五、选型与使用建议
- 保持电流（Ihold）应高于系统最大正常工作电流，留有合适余量，以避免误动作。
- 跳闸电流（Itrip）表示在规定时间会动作的阈值，需根据系统允许的过流持续时间选择合适型号。
- 密切关注环境温度与器件功耗（Pd），高温或受限散热条件下应按厂家温升曲线进行电流降额。
- 跳断后阻值上升（R1max 48mΩ）会导致电路在保护状态下仍有一定压降和发热，应考虑该特性在故障状态下的影响。
- 若为汽车或关键安全系统，请确认是否需要通过AEC、UL等认证，并考虑增加冗余保护。
六、PCB安装与工艺要点
- 按2920封装推荐焊盘设计布局，保证良好焊接和散热路径。
- 遵循无铅回流焊工艺曲线，避免过热或过长时间的高温影响材料性能。
- 贴装时避免在器件体上施加机械应力，储存时防潮防静电。
- 在高电流应用中，可在器件附近加宽铜箔或增加过孔改善散热。
七、可靠性与检验
建议在样机阶段进行实际工况下的热测、长期循环测试以及短路耐受测试，验证Ihold/Itrip随温度漂移及重复动作后的稳定性。如有特殊认证需求，请在采购前与厂商确认相关测试报告与资质。
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