SG339

Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
R @ 25°C:	12 Ohms
Tolerance:	±10%
Current - Steady State Max:	4A
R @ Current:	220 mOhms
Diameter:	0.500" (12.70mm)
Lead Spacing:	0.350" (8.89mm)
Approvals:	CSA, UR
Series:	SURGE-GARD™
Packaging:	Bulk

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Introduction

Inrush current limiters (ICL) are devices used to limit the initial current drawn by a transformer or other electrical load, and are essential components in regulating the power supply. One of the more common types of ICLs is the SG339, which is a cost-effective and reliable component for power switch-on/off applications. In this document, we discuss the application field and working principle of the SG339 in detail.

Application Field

The SG339 is a type of electronic thermal switch which can help to reduce power losses and protect equipment. It is suitable for use in various energy-saving and power-saving applications such as power supply systems, household appliances, and office automation equipment. It is also suitable for VLSI or chip circuits.In addition, it can also be used in various automated control systems, including PLC and motor speed control. Moreover, its small size, high current holding, and low operating temperature makes it well suited for applications such as surge protection in computers.

Working Principle

The working principle of the SG339 is based on the dynamic resistance of the thermal switch. When power is applied to the device, the temperature of the bimetallic strip inside the device rises. The current through the device is limited by the resistance of the bimetallic strip as it changes with temperature. Specifically, when the temperature of the device increases, the resistance of the bimetallic strip also increases, which in turn reduces the current that the device can carry.Once the set temperature has been reached, the thermal switch will be automatically disconnected, thus preventing an excessive current. This helps to protect the connected devices from overcurrent conditions and ensures their safe operation.

Conclusion

In conclusion, the SG339 is a reliable and cost-effective inrush current limiter that can be used in various energy-saving and power-saving applications. Its working principle is based on the dynamic resistance of the thermal switch, which helps to limit the initial current drawn by a transformer or other electrical load. It is thus an essential component in regulating the power supply and in protecting the connected devices from overcurrent conditions.

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