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Littelfuse SMDC300F/24-2 SMDC300F
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
20
specifications
Core information
- Product name
- Littelfuse SMDC300F / 24-2
- Type
- LITTELFUSE
- Unit
- Electronic Component
- Minimum package
- 4000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- LITTELFUSE
- Electronic Component
- SMDC300F/24-2
- Electronic Component
- 1
- Electronic Component
- 1.1mm
- Package
- 2920
- Electronic Component
- Resettable Fuse
- Electronic Component
- 0.183g
- Electronic Component
- 7.7mm
- Electronic Component
- 1.1mm
- Electronic Component
- 1
- Electronic Component
- 5s
- Electronic Component
- BM0228150884
- Operating Temperature
- 40℃~+85℃
- Voltage Rating(Vmax)
- 24V
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SMDC300F/24-2 — Littelfuse 可自恢复PTC保险（产品概述）
一、产品简介
SMDC300F/24-2 是 Littelfuse 提供的一款表面贴装（SMD）聚合物正温度系数（PTC）自恢复保险元件，适用于24V直流系统的过流保护。器件尺寸为 7.7 × 5.3 × 1.1 mm（2920 封装）、带卷带（T/R）包装，适合自动贴装与波峰/回流焊工艺。
二、关键电气与机械参数
- 额定耐压：24 V DC
- 初始态电阻（Rmin）：15 mΩ
- 跳断后最大电阻（R1max）：72 mΩ
- 名义保持电流（产品说明）：3 A（保持） / 6 A（触发，典型）
- 额外测试值：保持电流项（Ihold）：6.4 A（用户提供数据）
- 最大短时承受电流（Imax）：40 A
- 最大耗散功率（Pd）：1.7 W
- 响应时间示例：5 s（典型，视条件变化）
- 工作温度范围：-40 ℃ ~ +85 ℃
- 尺寸/封装：7.7 × 5.3 × 1.1 mm（2920 / SMD）
说明：为完整反映提供的信息，列出文档中出现的多个“保持电流”指标；在具体选型时应以厂家数据手册中标注的标称值和测试条件为准。
三、工作原理与行为特征
PTC 聚合物在正常工作时表现为低阻抗，突发过流使元件自发升温并进入高电阻态，从而限制电流并保护下游电路。故障解除并冷却后，阻值恢复到低阻态，器件自动复位，无需更换。注意：触发电流与环境温度、散热条件和通电时间强相关，设计时需考虑实际工况。
四、典型应用场景
- 24VDC 电源分配与总线保护
- 电池组与充电线路短路保护
- 电机驱动、继电器线圈和电磁阀的过流防护
- 通讯设备、工业控制模块与嵌入式系统的输入保护
五、选型与应用建议
- 确认实际工作电流与短时浪涌电流，保持电流应高于持续工作电流并低于触发电流。
- 环境温度上升会降低保持电流，需按最高工作温度做适当降额。
- 对于频繁较大浪涌（如电机启动），建议在PTC前并联限流器或采用分级保护策略。
- PCB 布局应确保良好散热：充足焊盘、合理热铜面积与靠近受保护点布置以缩短引线长度。
- 遵循 Littelfuse 推荐的回流焊曲线以避免器件机械/热应力损伤。
六、可靠性与包装
工作温度范围宽，能承受多次触发-复位循环；卷带包装（T/R）便于自动化装配。为保证可靠性，建议在长期储存和装配过程中避免潮湿与外力压迫。
七、总结
SMDC300F/24-2 是一款为24V系统设计的、尺寸紧凑且适于高速贴装的SMD自恢复保险，适合对体积、自动装配及可复位保护有要求的电源与工业电子应用。选型时请参考具体应用的温度、浪涌特性与制造商数据手册，以确保保护性能与长期可靠性。
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