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DOWO 500mA/24V 500MA
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- DOWO 500m A / 24V
- Type
- DOWO
- Minimum package
- 4000 编带
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- DOWO
- Electronic Component
- 500mA/24V
- Electronic Component
- 1
- Package
- 1206
- Electronic Component
- Resettable Fuse
- Electronic Component
- 0.032g
- Electronic Component
- 1
- Electronic Component
- 8s
- Electronic Component
- BM0258715509
- Operating Temperature
- 40℃~+85℃
- Voltage Rating(Vmax)
- 24V
- Power(Pd)
- 600mW
- Current(Imax)
- 40A
- Electronic Component
- Electronic Component
- Electronic Component
- 4000
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
DOWO（东沃）1206 自恢复熔断器 — 500mA / 24V 概述
一、产品简介
DOWO（东沃）1206 封装自恢复熔断器（PTC型），额定工作电压24V，保持电流（Ihold）0.5A，适用于24V电源系统的过流保护与短路防护。器件在过流时迅速升温增阻实现限流保护，故障解除后能自动恢复低阻态，免除更换操作，适合高可靠性和维护不便的应用场景。
二、主要电气参数
- 最高工作电压（Vmax）：24V
- 最大可承受电流（Imax）：40A（短时冲击）
- 保持电流（Ihold）：0.5A（不动作）
- 跳闸电流（Itrip）：1A（典型触发）
- 功率消耗（Pd）：600mW（稳态或特定测试条件）
- 初始态阻值（Rmin）：≈150mΩ
- 跳断后阻值上限（R1max）：700mΩ
- 动作时间：约8秒（在规定过流条件下）
- 工作温度：-40℃ 至 +85℃
- 封装：1206（SMD，便于贴片安装）
三、典型特性与优势
- 自恢复功能：过流后自动进入高阻限流，故障消除后恢复低阻态，减少维护成本。
- 小型化：1206贴片封装占板面积小，适合空间受限的电路板设计。
- 低导通阻抗：初始态约150mΩ，有利于降低压降和功耗。
- 宽温范围：适用于汽车电子、工业控制等温度变化较大的环境。
- 抗冲击能力：可承受短时高达40A的冲击电流，适合含启动电流的负载。
四、应用场景
- 24V 汽车电子与轻型商用车电源保护
- 电池包和电源管理模块的输出保护
- 工业控制、PLC、电机驱动的辅助电源防护
- LED 驱动、电源适配器与充电设备的短路保护
- 通信设备与行车记录仪等对可维护性要求高的系统
五、选型与使用建议
- 留有裕量：建议工作电流低于 Ihold，常用设计取 70%~80% 的裕量以避免重复动作。
- 考虑环境温度：高温下 Ihold 会降低，应根据最高环境温度参照厂家热特性曲线做降额处理。
- 布局注意：避免靠近持续热源安装，散热条件会影响动作时间与可靠性。
- 与系统保护配合：在需要快速断开的大电流故障场合，可与熔断器或断路器并用，利用自恢复器件作为二级保护或限制启动电流。
六、可靠性与封装
1206 SMD 封装便于自动化贴装，满足表面贴装工艺要求。器件在多次动作恢复后阻值会有所上升（跳断后阻值最高可达700mΩ），属于正常现象，应在设计中考虑长期变化对电路影响。
七、采购与替代
品牌：DOWO（东沃）。选购时请确认完整型号与批次，并向供应商索要完整的电气特性曲线与热特性图以便准确设计。若需更高电流或更低电阻的保护方案，可考虑同类更大封装或并联使用，但并联需要匹配和热均衡设计。
总结：DOWO 1206 自恢复熔断器以其小尺寸、自动复位与良好的短时抗冲击能力，适合各种24V电子系统的过流防护。合理设计裕量与热环境，可获得长久可靠的保护效果。
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