B57364S2109A2

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Inrush Current Limiters (ICL)

An Inrush Current Limiter (ICL) senses an initial large inrush of current and limits it to a predetermined level. The ICL includes a B57364S2109A2, which is a NTC thermistor in a leaded resistor package. This limiter helps to protect the control circuits or other components from being damaged during a power surge.

Application Field

The B57364S2109A2 can be used in electrical and electronic equipment including:

• Data processing systems, such as computers and accessories
• Consumer applications, such as TVs, radios, projectors, audio systems, and appliances
• Industrial equipment, such as pumps, motors, meters, and control devices
• Detection systems, such as optical and temperature sensors

Working Principle

The ICL works on the principle of an NTC thermistor. The thermistor has a negative temperature coefficient, meaning that its resistance decreases when the temperature increases. When current passes through the thermistor, it causes its temperature to increase. As the temperature increases, the thermistor\'s resistance decreases, thereby allowing more current to flow. This causes a positive feedback loop that increases the current, but only up to a predetermined limit.

The inrush current limiters will only limit the inrush current for a very short time, usually only only 1-25 milliseconds. After this time period, the thermistor heats up and its resistance drops, allowing the current to flow through normally.

Conclusion

The B57364S2109A2 is a NTC thermistor-based inrush current limiter. It is widely used to protect electronic components from power surges and short-term overcurrents. Inrush current limiters have the advantage of allowing the normal current to flow immediately after the inrush period ends. This helps to reduce the potential for damage to delicate electronic equipment.

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