L25J4K0

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Chassis Mount Resistors are a family of resistors designed to be mounted to a bulkhead or metal enclosure. They typically have high current and power ratings, making them suitable for applications requiring more heat dissipation than ordinary through-hole or surface-mount resistors can provide. The L25J4K0 is a recently released series of these resistors from Vishay Semiconductors.

The L25J4K0 series resistors offer a broad range of ratings, from 0.25W, up to 25W continuously. The maximum temperature rise of 75°C is also above average compared to other series of chassis mount resistors. For many applications, this series provides very good thermal behavior, with a low profile of only 9mm, allowing more space for other components.

The L25J4K0 series resistors are designed for a wide range of applications primarily in the industrial, automotive and telecom markets. Typical examples include control systems, DC/DC converters, optical networks, audio/video equipment, motor control and power supplies. The resistors are ideal for use in harsh environments, and can be used with voltages up to 250 V.

The working principle of the L25J4K0 series resistors is based on the standard resistive element. A thin film of resistive material is deposited on an alumina substrate using photolithography, and then metalized with a nickel-chrome alloy. The resistors are rated to provide a constant resistance value over a specified temperature range. The resistors are designed for operation over a wide temperature range—from -55°C to +175°C —and the resistors also provide excellent stability, with a low change in resistance with time.

The L25J4K0 series is also designed for high surge durability, withstanding a overload of up to 4X the rated voltage for one second. The resistors are very rugged, with a high thermal and vibration resistance, and are designed to withstand shock and vibration, which ensures long term reliable operation in demanding environments.

The L25J4K0 series resistors offer very high power density in a small volume. The small size and high power rating make them an ideal choice for use in small spaces, making them suitable for a wide range of applications. The resistors also offer a low temperature coefficient, making them very stable over time, and enabling them to cope with changing operating conditions.

The L25J4K0 series resistors offer an efficient, reliable and low-cost solution for a wide range of applications. The broad range of ratings combined with their good temperature stability and high surge durability make them an ideal choice for use in industrial, automotive and telecom applications.

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