CMF503K3000JNBF

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Through Hole Resistors are passive electrical components used to reduce current flow and to adjust voltage levels within circuits. The CMF503K3000JNBF is a two-terminal, through hole resistor with a power rating of 300 W and a rated operating temperature range of -55°C to +155°C. Its main use is to limit the current in any circuit, making it an ideal choice for any high current applications.

Application Field

The CMF503K3000JNBF is generally used to limit the current in any circuit, making it an ideal choice for various high current applications such as power supplies, motor drives, inverters, high power amplifiers, telecommunications equipment, and automotive applications. This resistor is also able to withstand high temperatures, making it suitable for high temperature environments.

Working Principle

The CMF503K3000JNBF features two component pieces­­—a leaded-wire resistor element and a metal oxide film resistor element. The leaded-wire resistor element consists of a bare wire that has nickel-chrome, molybdenum, or manganese-iron wire wound onto a ceramic core. This element is designed for high-Freq response and pulse applications. The metal oxide film resistor element consists of a film of metal oxides including manganese, cobalt, iron, aluminum, titanium, and copper, applied to a ceramic or mica substrate. This element is designed for high power rating, low temperature coefficient of resistance, and very low noise.

When a voltage is applied to the leaded-wire element, a change in electrical resistance occurs. This change causes a portion of the applied energy to be converted into heat, which is dissipated from the element. The metal oxide film element works on the same principle, but in a more controlled manner. The metal oxide film has a more or less constant high-temperature resistance and is able to dissipate more power than the leaded-wire element.

The CMF503K3000JNBF has a self-healing mechanism, which uses a current-limiting technology to prevent circuit overloads and ultimately circuit damage. This is achieved by limiting the amount of current passing through the resistor to a specific, predetermined level, instead of allowing the current to build up until it reaches an uncontrollable level. In case of a short-circuit, the current will be limited, thus protecting the circuit.

Conclusion

The CMF503K3000JNBF is a two-terminal, through hole resistor that is designed for high current applications. It has a power rating of 300W and a rated operating temperature range of -55°C to +155°C. It is composed of two component pieces—a leaded-wire resistor element and a metal oxide film resistor element. It is ideal for power supplies, motor drives, inverters, high power amplifiers, telecommunications equipment, and automotive applications. Its self-healing mechanism is also designed to protect against circuit overloads and circuit damage.

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