FCR3WSJT-73-300R

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Through hole resistors, commonly known as leaded resistors, conventional resistors, or discrete resistors, are resistors with leads or legs coming out from one or both ends of the resistor body. Historically, leaded resistors are the earliest form of resistor, followed by surface mount resistors. One of the most popular type of leaded resistors is FCR3WSJT-73-300R. This article will discuss the application field and the working principle of this type of resistor.

Application Field

FCR3WSJT-73-300R is mostly used for power supply applications, such as voltage regulators, output circuits, linear regulators, power supplies, etc. Due to the stability of the resistor, it is also used in timing circuits and long-term measurements due to its high precision. In some cases, it is also used as a relatively cost-effective option for battery chargers.

This type of resistor is also used in high-precision applications, such as automotive electronics and medical electronics, where it provides high accuracy and stability on demand. It is also widely used in plasma display panels, digital TV, and other electronic assemblies. In addition, FCR3WSJT-73-300R is a popular choice when used in motherboards and circuit boards, as it can be easily snapped into slots and even be soldered directly to the board.

Working Principle

The working principle of FCR3WSJT-73-300R is based on the Ohm’s law. The resistor is made of metallic carbon film, and two pieces of metallic ends protrude through the plastic body. When the resistor is placed in the circuit, a current passes through it and the resistor’s metallic ends will heat up. The heat causes resistance, and the heat will dissipate through the heatsink.

The resistance value of FCR3WSJT-73-300R is determined by the temperature coefficient of the carbon film, the length and diameter of the metallic ends, and the size of the heatsink. As the current passing through the resistor increases, more heat will be generated and the thermal time constant of the resistor will also be increased. The heat generated by the current passing through the resistor is then dissipated to the ambient air through the heatsink.

In conclusion, FCR3WSJT-73-300R are widely used as leaded resistors in many applications, such as power supply circuits, timing circuits, and precision measurement. Their working principle relies on the Ohm’s law and the ability to dissipate heat through a heatsink. The resistor’s value is determined by the amount of current passing through the resistor, the temperature coefficient of the carbon film, the length and diameter of the metallic ends, and the size of the heatsink.

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