B57211P0409M351

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Inrush Current Limiters (ICLs) are components used for limiting or suppressing the inrush current, also known as “switch-on surge”, experienced by a circuit when an external current source is connected to its input. During switch-on, the external source initially interacts with the circuit’s capacitors, resulting in the large and fast current spike of up to several times the normal steady-state current. While this phenomenon usually only lasts for a few seconds or less, its effects on the circuit and its components, such as the inductors and the relay contacts, can be quite detrimental. To prevent these issues, an Inrush Current Limiter can be installed in the circuit, typically between the power source and the circuit input. The specific ICL model, the B57211P0409M351, is specifically designed for low profile applications, with its dimensions of 4.2mm x 5.9mm x 1.2mm and its low capacitance of 86 pF.

The working principle of the B57211P0409M351 is quite simple. It features an NTC (negative temperature coefficient) thermistor and a Zener diode connected in series. During normal system operation, the thermistor serves as an open circuit, effectively acting as a switch to keep the Zener diode and other downstream components isolated from the power source. During inrush current events, the resistance of the thermistor decreases as its temperature rises, allowing the extra current to flow around the Zener diode. The Zener diode then recovers, sustaining the forward voltage drop needed to maintain the current flow at the desired level.

The B57211’s electrodes are evenly spaced from each other to ensure equal power distribution upon connection with any type of equipment, such as a DC-DC (direct current) converter, AC-DC (alternating current) converter, an LED (light-emitting diode) dimmer, or any other electronic device. Additionally, it features an internal operating temperature ranging from -40°C to +125°C and a 125 mA nominal current rating. This makes it perfect for use in a variety of applications, such as consumer electronics, automotive electronics, and power supplies.

The Inrush Current Limiter (B57211P0409M351) is a highly useful component for implementing a low-cost and highly effective current limiting solution. Its increased circuit stability, coupled with its ease of use and low capacitance, make it a great choice for a variety of low-profile applications.

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