Vishay Intertechnology, Inc. announced a new surface-mount Power Metal Strip® resistor designed to save space in automotive, industrial, computer, and consumer applications. The Vishay Dale WSHM2818 combines a high 7-W power rating with extremely low resistance values down to 1mΩ in the compact 2818 case size. The advanced construction of the WSHM2818 resistor incorporates improved thermal management and a solid metal nickel-chrome or manganese-copper alloy resistive element with low TCR (< 20 ppm/ degree C).
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This results in a high-power resistor in the 2818 package size that maintains the superior electrical characteristics and performance of the Power Metal Strip construction, such as excellent 1,000-hour load life stability and very good resistance to short time overload of < ± 1%. The device’s high power-to-footprint-size ratio allows designers to save board space and create smaller end products by replacing larger resistors with similar power capability and multiple devices with lower power ratings.
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The WSHM2818 also fits into industrial controls, including down-hole test/measurement equipment for oil/gas well drilling; inverter controls for HVAC systems; motor drives and dc-dc converters for servers, VRMs for computers, and Li-ion battery safety and management. Samples and production quantities of the new resistor are available now, with a lead time of six to 10 weeks for larger orders. Pricing for U.S. delivery only starts at $0.38 per piece in 10,000-piece quantities.
Like all Power Metal Strip resistors, the device released today features an all-welded construction that contributes to its superior electrical performance. A proprietary processing technique produces extremely low resistance values ranging from 1 mΩ to 100 mΩ, with tight tolerance of ± 1.0%. The WSHM2818 provides very low inductance of < 5 nH, an excellent frequency response to 50 MHz, low thermal EMF (< 3 μV/ degree C), and an operating temperature range from -65 to +170 degrees C. The device is RoHS-compliant, halogen-free, and Vishay GREEN.
source: http://www.powerpulse.net/story.php?storyID=31321
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