MF72-012D15

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Inrush Current Limiters (ICL)

Inrush current limiters (ICL) are electronic components with the ability to restrict the inrush current in an electrical circuit. This is most often used in the power supply industry to protect circuits from peaks in current, which can cause blown fuses, malfunctioning circuits, or fires. ICLs are designed to regulate the current flowing into the circuit and prevent the current from exceeding the rated limit. The MF72-012D15 is a prime example of an ICL and it is designed as a low-cost, high-performance, reliable solution.

MF72-012D15 Application Field and Working Principle

The MF72-012D15 is an axial leaded ICL designed to limit the surge current passing through power-supply circuits, such as an AC adaptor, switch mode power supply, PFC, or audio amplifier. The MF72-012D15 is a low-cost high-performance solution that provides reliable performance and low resistance. With its low leakage current (0.25 uA typical at room temperature) and low static resistance (0.2 Ω typical @ 25 Vdc), the MF72-012D15 is ideal for use in a wide variety of consumer electronics, industrial control, and communication devices. The MF72-012D15 is rated for a 12Vdc, 2.5 Amp surge current with a maximum peak current of 3 Amps.

The working principle of the MF72-012D15 can be summarized as follows. During a surge, the ICL reduces the voltage across and through itself allowing the surge current to flow into the supply, but at a much lower rate. The ICL acts as a high resistance element that limits the surge current to a predetermined safe level. This process reduces the generated heat within the circuit and eliminates the need to size nearby components to handle the expected high peak current.

The ICL is designed to trip only once for a given inrush. Once the ICL trips, the voltage returns to its original level. As such, the ICL is a one-time operation and not designed to keep the circuit from tripping in the future.

When selecting the correct ICL for your application, it is important to consider the surge protection voltage rating, current rating, and trip time. Higher ratings are available, however, the more conservative ratings should be chosen as they are better able to protect against surges.

In summary, the MF72-012D15 ICL is a low-cost, high-performance electronic component that can be used in a variety of applications. By regulating the current in a circuit, it effectively protects components from dangerous inrush currents. When selecting an ICL, it is important to remember to select an appropriately rated device for your application.

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