Malvern, Pa. Vishay Intertechnology, Inc. claims its 5-watt Power Metal Strip resistor is the industry's first such device to offer a 5-watt capability in a 2818 package. This surface-mount resistor may be used in current sensing, voltage division and pulse applications.
The Vishay Dale WSH2818 resistor incorporates a proprietary construction with improved thermal management that enable the 5-watt power rating in a small package size while still maintaining the electrical performance of the Power Metal Strip construction. The surface-mount resistor, in a package measuring 0.280 x 0.180 x 0.032 in. (7.1 x 4.6 x 0.813 mm), also features very low resistance values ranging from 1 milliohm to 100 milliohms. The device is also said to offer low inductance values of <5 nH, excellent frequency response, and low thermal EMF.
Rated for an operating temperature range of -65°C to 170°C, the Vishay Dale WSH2818 is capable of higher temperature performance than devices built with thin-film or thick-film resistor technologies, said the company. The device is RoHS compliant and lead free, featuring terminals with a 100% matte tin (Sn) finish over a nickel (Ni) barrier. The resistor's all welded metal construction includes a low temperature coefficient of resistance (<20 ppm/°C) nickel-chrome or manganese-copper alloy resistive element.
Designed for use in current sensing, voltage division, and pulse applications, the WSH2818 resistor targets dc-to-dc conversion and VRMs in desktop and notebook computers, electronic controls in automotive systems, and motor controls for industrial systems. It can also be used for base station power supplies in telecom systems, and lithium-ion battery protection and battery charging systems in notebook computers and consumer electronics.
Designers can use the WSH2818 resistor as a replacement for larger surface-mount components to realize board-space savings and to enable the manufacture of smaller, lighter end products. In addition, designers can use one WSH2818 resistor to replace multiple discrete resistors with lower power ratings. The device can also be used as a 5-watt alternative to a though-hole current-sensing resistor, which will reduce manufacturing and placement costs.
Available in tape-and-reel packaging, samples and production quantities of the WSH2818 resistor are available now, with a lead time of eight to ten weeks for larger orders. Pricing for U.S. delivery starts at $0.59 each in quantities of 10,000.
Vishay Intertechnology, Inc., 1-402-563-6320, www.vishay.com
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