David Winkler, Product Manager
IRC-Wirewound & Film Technologies
Phone: 828-264-8861
Click Here to Request More Information or Respond

Munich, Germany (November 9, 2004) - Providing design engineers with a rugged surface mount current-sense device capable of handling high current loads, TT electronics IRC Wirewound and Film Technologies Division has developed an ultra-low resistance (< 2m Ohm), surface mount metal strip resistor rated for 45 amps of current at 1 watt while exhibiting extremely 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 Ohm to 0.002 Ohm.

According to David Winkler, product manager at IRC's Wirewound & Film Technologies Division, "The CSS Series resistors are used in voltage regulation modules (VRMs) to sense the current on multiple phases to help balance the overall load. Design engineers seeking to balance current between the multiple phases (traces) required to supply the 60+ amps for today's microprocessors require a simple linear method of current sensing that is both stable and reliable over a broad temperature range. Other current sense methods, such as RDSon or inductor (RL) sensing, are not as accurate over temperature."

The CSS Series resistors are used extensively 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 1W @ 70ºC, the CSS Series resistors feature resistance values as low as 0.0005 Ohm to .003 Ohm, in tolerances of 1%, 3% and 5%, with TCRs as low as ±20 ppm/ºC. They are rated for operation from -40ºC to +125ºC. Extremely low inductance values of < 0.1nH at 100Khz and 300Khz and continued stability beyond 300MHz make the CSS Series ideal for high speed computer power supply applications. The CSS Series chips fit within the industry-standard 2512 footprint, with a board-mounted profile of just 0.030" (0.76mm).

PDF versions of the CSS Series data sheets can be accessed at www.irctt.com/pdf_files/CSS.pdf.

For more information about CSS Series resistors, contact the IRC Wirewound & Film Division Sales Department at +1-828-264-8861, e-mail at waft.sales@irctt.com, or visit IRC on the web at www.irctt.com.

In the U.K. contact Welwyn Components at +44-1670-822181; email at info@welwyn-tt.com or visit the Welwyn web site at www.welwyn-tt.com. In Germany, contact TT electronics at +49-8161-49-08-0; visit www.tt-electronics.de or email information@tt-electronics.de. In France, contact TT France at +33-1-45-12-38-80; visit the Web site www.ttelectronics.fr or e-mail sales@ttelectronics.fr. In Italy, contact TT S.r.l. at +39-026-888 951; visit www.ttelectronics.it or e-mail info@ttelectronics.it.

IRC Inc. is a leading international manufacturer of advanced film, metal glaze and wirewound resistive products with facilities in Corpus Christi, Texas; Boone, N.C.; Smithfield, N.C. and Barbados, West Indies. IRC is part of TT electronics plc, a leading global engineering company manufacturing a range of specialist products, including electronic passive components, electromechanical and electronic assemblies and sensor modules for the automotive, telecommunications, computer, medical and aerospace markets. TT electronics’ Web site can be found at: www.ttelectronics.com.

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