贴片自恢复保险丝PTC
自恢复保险丝(以下简称保险丝)由聚合物树脂基体及分布在里面的导电粒子组成，在正常情况下，导电粒子在树脂基体中构成链状导电通路，保险丝表现为低阻（a）。电路中有过电流发生时，流经保险丝的大电流产生的热量使聚合物树脂基体体积膨胀，切断了导电粒子形成的链状导电通路，导致保险丝的阻升高，从而起到对电路的过流保护作用（b）。故障排除后，树脂重新冷却结晶，体积收缩，导电粒子重新形成导电通路，保险丝恢复为低阻。
自恢复保险丝参数
在自恢复保险丝选型过程中，主要涉及以下参数
1.保持电流（Ih）：25℃静止空气环境中不触发电阻突越的电流。
2.触发电流（It）：25℃静止空气环境中PTC聚合物自复保险丝从低阻转为高阻的小电流。
3.电压（Vmax）：PTC聚合物自复保险丝的工作电压。
4.电流（Imax）：PTC聚合物自复保险丝能承受的电流。
5.动作功率（Pdt.）：25℃环境温度时PTC聚合物自复保险丝动作状态下的消耗功率。
6.动作时间（Ttrip）：5倍保持电流下动作时间。
贴片自恢复保险丝PTC
Model Number: SMD1206，1812，0805，2920
Key Specifications/Special Features:
1812封装：0.1~3.5A/6V~33V
1206封装：0.05A~2A/6V~60V
0805封装：0.1A~1.1A/6V~15V
1210封装：0.05A~1.5A/6V~30V
2920封装：0.3A~3A/6V~60V
SMD0805P010TF SMD0805P020TF SMD0805P035TF SMD0805P050TF
SMD0805P075TF SMD0805P100TF SMD1206P012TF SMD1206P016TF
SMD1206P020TF/24 SMD1206P025TF SMD1206P035TF/16 SMD1206P050TF
SMD1206P050TF/15 SMD1206P075TF SMD1206P075TF/13.2 SMD1206P100TF
SMD1206P110TF SMD1206P150TF SMD1026P200TF SMD1210P005TF
SMD1210P010TF SMD1210P020TF SMD1210P035TF SMD1210P050TF
SMD1210P075TF SMD1210P110TF SMD1210P150TF SMD1812P010TF
SMD1812P014TF SMD1812P020TF SMD1812P050TF SMD1812P075TF
SMD1812P075TF/24 SMD1812P075TF/33 SMD1812P110TF SMD1812P110TF/16
SMD1812P110TF/24 SMD1812P110TF/33 SMD1812P125TF/16 SMD1812P125TF/6,4L
SMD1812P150TF/8 SMD1812P150TF/12 SMD1812P150TF/24 SMD1812P160TF/8(4L)
SMD1812P200TF SMD1812P260TF SMD1812P300TF SMD2016P030TF
SMD2016P050TF SMD2016P100TF SMD2016P100TF/33 SMD2016P150TF
SMD2016P200TF SMD2920P030TF SMD2920P050TF SMD2920P075TF
SMD2920P100TF SMD2920P125TF SMD2920P150TF SMD2920P185TF
SMD2920P200TF SMD2920P200TF/24 SMD2920P250TF SMD2920P260TF
SMD2920P300TF SMD2920P300TF/15