Surface-mount polymer-based resettable fuses

A family of surface-mount polymer-based resettable fuses in chip sizes from 0805 to 2920 has been introduced by Wickmann Components.

A family of surface-mount polymer-based resettable fuses in chip sizes from 0805 to 2920 has been introduced by Wickmann Components.

Based on positive temperature coefficient (PTC) technology, these Polyfuse components ensure reliable overcurrent protection for equipment including computer motherboards, USB hubs and ports, CD/DVD drives, PDAs, digital cameras and battery packs.

Each Polyfuse Series features low voltage drops and fast trip times while providing full resettability.

This makes them ideal for protecting datacomms and battery-powered applications where spikes may occur during interchange of batteries or plug and play.

The SMD0805 Series, which has the industry's smallest footprint for resettable fuses, comprises four hold current ratings from 100 to 500mA with a current interruption capability of 40A at voltages from 6 to15V, making them suitable for high-density circuit board applications in computers, cellular phones and general electronics.

The SMD1206 and SMD1210 Series, with current ratings from 50mA to 1.5A and voltages from 6V to 30V, are optimised for the protection of computer peripherals, PC cards and various I/O port types.

A typical application of the SMD1812 is to protect disk drive capacitors against inrush currents caused by misconnection of 5 and 12V power lines between the disk drive and host computer.

Hold current voltage ratings range from 100mA to 2.6A, with voltages from 6 to 60V and trip times as low as 20ms.

The SMD2016 and 2920 are also designed for use in high-density circuit board applications.

They offer a wide range of hold currents from 300mA to 3.0A and voltages from 6 to 60V.

In addition to SM devices, Wickmann can supply leaded, axial leaded strap and disk type resettable fuses.

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