H437R4BCA

Through hole resistors are basic passive components used to manipulate electrical current in electrical circuits. They are manufactured in a wide variety of sizes, shapes, and ratings depending on the application. The H437R4BCA resistor is a standard through hole resistor considered to be a radial-leaded device. Following is an overview of its application field and working principle.

Application Field

The H437R4BCA is most commonly used to provide resistive load elements, providing a steady current limiting voltage in medium-power (approximately 0.5W) applications. Their application fields range from power supplies, current limiting/protection circuits, and even various RF preparations to automotive electronics, lamp lighting, and HVAC systems, ventilation and air conditioning.

Construction

The H437R4BCA resistor is a cylindrical construction with two radial leads. These leads are used for mounting on printed circuit boards (PCBs). It is made up of a closed ceramic core covered with a sintered carbide layer for better heat dissipation. A layer of high temperature resistive material is deposited over the carbide layer. This layer is then covered with a protective coating of varnish and protected by a metal enclosure.

Working Principle

The H437R4BCA works by converting electrical energy to heat energy through electrical resistance. This is done by passing current through the resistor, creating a voltage drop when the current is limited due to the resistance of the resistor. This voltage drop, measured in volts, is called the resistor’s rated value, or resistance. When the applied voltage is greater than the rated value, the resistor will dissipate the energy as heat.

The rate at which the resistor dissipates energy is determined by the wattage rating. This rating is determined by the amount of current that can flow through the resistor without exceeding the internal temperature rating. This rating is typically between 0.125 watts and 0.5 watts for the H437R4BCA. In summary, the fundamental working principle of the H437R4BCA in an electrical circuit is to absorb energy and prevent too much current from flowing.

Conclusion

The H437R4BCA resistor is a common through hole resistor, used for various electrical applications that require a medium-power range. It is constructed out of a ceramic core surrounded by layers of carbide and resistive materials, offering high temperature performance and power rating. The resistor works by converting electrical energy to heat energy, using resistance to limit the voltage drop and wattage rating to prevent overheating.