MX1J4K7 is a power resistor manufactured by Ohmite. It has a resistance value of 0.4 ohms, and is rated for a power dissipation of 4 watts. The resistor is made of thick film material and designed for high frequency applications. The leads are made of nickel-plated copper. The resistor has an operating temperature range of -55°C to +155°C. It has an insulation resistance of 20 GO at 500 Vdc. The physical size of the resistor is 7.0 mm x 2.5 mm.