IRC Develops CSS Series Metal Strip Resistor

The Wirewound and Film Technologies Division of IRC Inc. (Boone, NC) has developed an ultra-low resistance (<2 mΩ), surface-mount, metal strip resistor rated for 45 A of current at 1 W while exhibiting low inductance and low TCRs. Designated the CSS Series, the resistor is offered in a two-terminal design and a four-terminal Kelvin design, with a resistance offering of 0.0005 Ω to 0.002 Ω. The CSS Series resistors are used in applications requiring precision current-sensing and power management circuits in computers, power supplies and motor control circuitry where current-sense devices are used.

Rated for a full 1 W at 70 °C, the CSS Series resistors feature resistance values as low as 0.0005 Ω to 0.003 Ω, in tolerances of 1%, 3% and 5%, with TCRs as low as ±20 ppm/°C. They are rated for operation from -40 °C to +125 °C. Low inductance values of <0.1 nH at 100 kHz and 300 kHz, and continued stability beyond 300 MHz make the CSS Series suitable for high-speed computer power supply applications. The CSS Series chips fit within the industry-standard 2512 footprint, with a board-mounted profile of 0.030 in (0.76 mm).