A. Features
重要特性
♦ Smaller size saves board space and cost
超小尺寸、节约空间和成本
♦ Resettable circuit protection
自恢复保护、免维护
♦ Fast time-to-trip
动作时间快
♦ Low resistance
低内阻值
♦ Lead-free and compliant with the European Union RoHS Directive 2002/95/EC
符合欧州ROHS无铅环保要求
B. Application
应用范围
Polymer Resettable Fuse for over-current, over-temperature and short-circuit protection
可恢复保险丝用于过流、温度和线路短路保护
♦ Loudspeaker、VCD、DVD、Transformers、Automotive electronics、Electronic toys、Motors
音响喇叭、VCD、DVD机、变压器、汽车电子、电子玩具、马达（电动工具）
♦ IEEE1394 Ports
IEEE1394通讯接口
♦ USB hub, ports and peripherals
USB交换机及外围设备
♦ Phones
电话设备
♦ Data communication
数据交换机
♦ Modems/ Ethernet/LAN
调制解调器/以太网
C. General Description
简要概述
Polymer resettable fuse are made of polymeric PTC materials which is a matrix of
自恢复保险丝是聚合物高分子材料通过特殊工艺而成，
polymer containing dispersed conductive particles. Generally, the device has a very
高分子粒子按一定的规律排列，正常情况下，自恢复保险丝器件处于低内阻状态，
low resistance. If an over-current happened, as a response to the damage current,
当电路中电流突然增大时，
the resistance will immediately increase to very high, reducing the current of the
器件将会在短时间内阻值升到高阻状态、高分子膨胀
circuit to a safe value that the loading can carry. Once fault to the circuit is weed out
从而起到减少过电流；
and power is recuperated, the polymer will deflate itself , the device will reset and is
一旦故障排除后，高分子将会恢复正常规则排序。
ready for normal operation.