MINISMDC110F/16-2 Circuit Protection

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PTC resettable fuses, also known as Positive Temperature Coefficient (PTC) fuses, are fast-acting electrically resettable fuse devices that protects over-current and short-circuits in a variety of electronic products. The most common type of PTC resettable fuse is the MINISMDC110F/16-2, a radial-leaded, surface-mount device. This device is often used in high-power, high-current applications such as distributed power systems, automotive, consumer electronics, networking, and telecom applications.

A PTC resettable fuse, such as the MINISMDC110F/16-2, is composed of a ceramic-filled polymeric material containing PTC particles. The particles activate and cause an increase in resistance when subjected to high currents. With proper thermal management by the application design, the device can be reset after the overload or short-circuit condition is removed.

Applications

The main applications of PTC resettable fuses are in distributed power systems, automobiles, consumer electronics, networking, and telecom. A distributed power system, for instance, relies on a large number of independent power sources to supply power to its various components. The system is vulnerable to overpower protection on its own and in most cases require a PTC fuse to prevent damage from overcurrents.

In automobiles, PTC resettable fuses are used to protect vehicular electronics such as audio systems, lights, power windows, and other systems from instability, overcharging, and overvoltage. In consumer electronics, PTC resettable fuses are used to protect the device from over-current, as well as spikes and shorts caused by lightning strikes, ESD, and other activities. PTC resettable fuses are also found in data centers, particularly after power supplies, to provide protection from over-current. Additionally, PTC resettable fuses are used in telecom applications, such as PON Box equipment, to protect against over-current in telephone lines.

Main Features of PTC Resettable Fuses

The primary features of PTC resettable fuses are the fast-acting protection, current rating resettability, and high breaking capacity. The PTC resettable fuse quickly responds to increasingly high currents by increasing their resistance. The user does not need to open and replace the fuse as the device can reset itself back to its original state after the overcurrent or short-circuit condition is removed. The PTC fuse can also safely handle high short-circuit currents due to the high breaking capacity of its ceramic body.

Working Principle of MINISMDC110F/16-2

The working principle of the MINISMDC110F/16-2 is quite simple. It is composed of a ceramic-filled polymeric material containing PTC particles that activate when exposed to high currents. The activated PTC particles start to resist current flow, which causes a voltage drop across the fuse and while the voltage drops, the current is slowly limited, finally protecting the application from the overcurrent/short circuit. The protection time is under 100 milliseconds and after the fault is declared, the device can restore itself back to its original state if the overcurrent/short circuits are removed under a certain time.

The MINISMDC110F/16-2 is a radial-leaded, surface-mount device, which has a compatible footprint allowing for the same board with other components, enabling easier integration. Furthermore, it has a self-resetting capability, which makes it much faster to react to fault conditions and reduces unnecessary downtime caused by manual resetting.

The MINISMDC110F/16-2 is also capable of protecting against short-circuit current from 6A@20℃ to 13A@85℃ with 4.3V or less holding voltage. This limits any chances of an over-current or short circuit causing any harm to the application circuit, allowing the system to keep running and minimizing damages.

Conclusion

The MINISMDC110F/16-2 is one of the most common PTC resettable fuses used in distributed power systems, automobiles, consumer electronics, networking, and telecom applications. It is composed of a ceramic-filled polymeric material, containing PTC particles, which increase in resistance when exposed to high currents. It is also fast acting and resettable, allowing for quicker response to fault conditions. The fuse is also capable of handling high short-circuit currents with its high breaking capacity of 4.3V or less.

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