B57127P709M301

Series:	P27
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
R @ 25°C:	7 Ohms
Tolerance:	±20%
Current - Steady State Max:	17A
R @ Current:	45 mOhms
Diameter:	1.2" (30.5mm)
Lead Spacing:	0.295" (7.50mm)
Approvals:	UL

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Introduction

Inrush current limiters (ICLs) are components that help circuit boards to limit the amount of initially required current while ensuring safe operation of the board and related components. In particular, the B57127P709M301 is a type of ICL that is used widely in the electronics industry. This article will discuss the application field and working principle of the B57127P709M301 in detail.

Application Field

The B57127P709M301 ICLs are used primarily in power supplies and other high voltage situations, where it is important to limit the amount of current that can be applied initially. The ICL components are designed to protect the board from unexpected spikes or surges in current that could damage the board, downstream components, and even risk an electric shock in hazardous situations.The ICLs can be used in AC/DC power supplies, DC/DC converters, motor control applications such as those found in electric vehicles, and various other circuits requiring power up or down. When associated with power supplies, they help to control inrush current during start up, keep the steady-state current at safe levels, and even filter out transient current created by potential surges in the circuit.

Working Principle

At its core, the B57127P709M301 ICL is comprised of two primary components: a resistor component and a thermistor component. The resistor is responsible for limiting the overall current drawn by the circuit while the thermistor is used to limit the inrush current that can be drawn. More specifically, the thermistor plays an important role in the operation of the circuit. When the ICL is first activated, the thermistor draws a high level of current from the circuit. This current surge is what limits the overall current that is drawn by the board. As the thermistor becomes heated, the resistance of the device increases and the current drawn is reduced until it reaches a steady state level. The resistor component of the ICL then helps to maintain this current level once the thermistor has reached its steady state level of resistance. The resistor component is rated to handle the power of the circuit and helps to keep the current levels at safe levels all throughout the power cycle.

Conclusion

To conclude, the B57127P709M301 ICL is a useful component to have in power supplies and other high voltage circuits. This ICL helps to limit the inrush current while protecting the board from potential power surges. The component is comprised of two components: a thermistor that is responsible for limiting the initial current surge, and a resistor that helps to maintain the current at a steady state safe level. The B57127P709M301 ICL is a valuable tool to have in circuits for safety and performance.

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