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BHFUSE BSMD1812-260-24V BSMD1812
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- BHFUSE BSMD1812-260-24V
- Type
- 1812
- Minimum package
- 1500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- BHFUSE
- Electronic Component
- BSMD1812-260-24V
- Electronic Component
- 1
- Electronic Component
- 3.41mm
- Package
- 1812
- Electronic Component
- Resettable Fuse
- Electronic Component
- 0.119g
- Electronic Component
- 4.73mm
- Electronic Component
- 1.5mm
- Electronic Component
- 1
- Electronic Component
- 2.5s
- Electronic Component
- BM0231067989
- Operating Temperature
- 40℃~+85℃
- Voltage Rating(Vmax)
- 24V
- Power(Pd)
- 1.2W
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
BSMD1812-260-24V 产品概述
一、产品简介
BSMD1812-260-24V 是佰宏（BHFUSE）出品的一款1812封装的PTC自恢复保险丝，用于对电路中的过流和短路故障提供自动保护。器件在正常工作时呈低阻抗，当电流超过一定阈值时迅速加热、阻值显著上升以限制电流并保护下游器件；故障解除后随着冷却自动恢复低阻态，适合需要重复保护且不便更换熔断器的场合。
二、主要参数
- 最大耐压（Vmax）：24 V
- 标称最大电流（Imax）：40 A（数据表条件下）
- 保持电流（Ihold）：2.6 A（器件在不触发条件下长期允许通过的最大电流）
- 跳闸电流（Itrip）：5.2 A（在规定时间内开始动作的电流阈）
- 功耗（Pd）：1.2 W（典型条件下）
- 初始态电阻（Rmin）：10 mΩ
- 跳断后最大电阻（R1max）：70 mΩ
- 动作时间：约 2.5 s（在指定过流条件下）
- 工作温度：-40 ℃ ～ +85 ℃
- 尺寸（L×W×H）：4.73 mm × 3.41 mm × 1.50 mm（1812 SMD）
三、性能特点
- 低阻抗启动：初始态阻值仅约10 mΩ，适合对压降敏感的电源路径。
- 快速自保护：在过流状态下约2.5秒动作，将阻值提升至最高约70 mΩ以限制电流。
- 自动恢复：故障解除后随着冷却可自动恢复到低阻态，支持多次循环保护。
- 紧凑封装：1812 尺寸适配自动贴片组装，节省PCB空间。
- 宽温度范围：-40 ℃ 到 +85 ℃，适应多种环境。
四、典型应用
- 24V 车载或工业控制总线短路保护（注意车规使用需结合认证）
- 电源输入保护、DC-DC模块二次侧保护
- 电池管理系统（BMS）与便携设备的过流保护
- 通讯设备、安防设备以及其他需自动复位保护的电路
五、选型与PCB布局建议
- 选型原则：长期工作电流应低于 Ihold（留有裕量），常见做法是将正常运行电流控制在 Ihold 的 60%~80% 范围内；若系统允许短时冲击电流，可参考 Itrip 值与动作时间匹配。
- 温度与散热：环境温度或邻近器件发热会降低器件承载能力，必要时应在布局时考虑散热铜箔和间距以降低器件温升。
- 布局建议：将器件放在靠近被保护输入/负载的电流路径上，保证焊盘与铜箔足够，避免温度敏感器件紧邻，以免误触发。
- 焊接工艺：采用标准SMD回流焊工艺，遵循厂家推荐的温度曲线以避免性能退化。
六、可靠性与注意事项
- 允许多次动作与恢复，但频繁触发会影响元件寿命与特性稳定性，应排查上游故障原因。
- Imax、Pd 等参数以制造商数据表为准，系统设计应参考完整数据表和热设计指南。
- 用于汽车或关键领域时，需确认器件的认证等级与实际运行条件匹配。
如需详细数据表、热阻曲线或回流焊推荐曲线，可联系供应商获取完整技术文件，以便在实际设计中完成更精确的电热仿真与选型验证。
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