RER45F2370RC02

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RER45F2370RC02 application field and working principle

Chassis Mount Resistors (CMR) are resistors mounted on brackets or chassis, which form part of a larger electrical or electronic device. They have a wide range of applications, for both mounting individual components and forming part of integrated circuits.

Applications

Resistors used in the chassis mount style are most often used for the purpose of noise suppression, to reduce interference in the operation of the electronic device. One of the most common applications is in the filtering of audio signals, where CMR devices are typically used as high-pass and low-pass filters.

CMR components are also used in power supply designs, providing stability to the construction. CMR elements are often preferred over surface mount packages due to their ability to dissipate heat without the need for additional components for overflow protection and higher temperature ratings.

CMRs can be used as part of a voltage divider circuit, which is often used to measure voltage or current. In this application, two resistors with a value proportional to the range of the measurement are connected in series with a reference voltage and a voltage divider output taken from the midpoint between them.

CMR components are also useful in certain audio amplifier designs, where the chassis mount resistor creates a current limiting path for audio signals passing through the amplifier. This helps to reduce the amount of noise generated within the device and maintain audio fidelity.

Working Principle

The principle behind Chassis Mount Resistors is simple; they resist the flow of electric current by increasing the resistance of the circuit. When an electric current is passed through a resistor, it must overcome the resistance of the device and experience a voltage drop. This voltage drop is dependent on the value of the resistor and the amount of current flowing through it.

CMRs are constructed using a variety of materials, with carbon composition and metal-film resistors being the two most common types used in chassis mount designs. Carbon composition resistors consist of a mixture of carbon particles and binder material, while metal-film resistors use a thin layer of metal deposited on the surface of a ceramic substrate.

When selecting a Chassis Mount Resistor, it is important to consider the power rating and temperature rating of the device. The power rating of the resistor should exceed the power anticipated to be dissipated by the device, while the temperature rating should be selected based on the operating temperature of the device.

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