Surface-Mount Resistor offers 5 W in 4527 package size.

Press Release Summary:

Measuring 0.455 x 0.275 in. with 0.095 in. profile, Power Metal Strip® WSR5 offers resistance values from 1-300 mW with ±1% tolerance and 10-300 mW with ±0.5% tolerance. Inductance values range from 0.5-5 nH. Featuring all-welded construction and molded, high-temperature encapsulation with integrated heat sink, current sensing resistor operates from -65 to +275°C. Applications include computer, telecommunications, and automotive systems.

Original Press Release:

Vishay's New High-Power, Surface-Mount Resistor is Industry's First 5-W Power Metal Strip® Device in Compact 4527 Package Size

New Current-Sensing Resistor Enables Design of Smaller and/or Higher-Performing Computer, Telecommunications, and Automotive Systems

MALVERN, PENNSYLVANIA - June 19, 2009 - Vishay Intertechnology, Inc. (NYSE: VSH) today announced that it is expanding its WSR series of Power Metal Strip® resistors with the industry's first such device to offer a 5-W power rating in the 4527 package size.

Like the WSR2 (2-W) and WSR3 (3-W), the new WSR5 measures just 0.455 in. by 0.275 in. [11.56 mm by 6.98 mm] with a height profile of 0.095 in. [2.41 mm], making it a compact 5-W solution for electronic controls in automotive systems, power supplies in communications base stations, and dc-to-dc converters and VRMs in high-end workstations and servers.

A proprietary processing technique allows the WSR5 to offer extremely low resistance values ranging from 1 mW to 300 mW in a standard resistance tolerance of ± 1 %. A tolerance of ± 0.5 % is available for the resistance range of 10 mW to 300 mW. The WSR5's very low inductance values range from 0.5 nH to 5 nH, and the device's temperature coefficients are ± 110 ppm/°C for the 7.5-mW to 9.9-mW range and ± 75 ppm/°C for the 10-mW to 300-mW range.

The WSR5 resistor's proprietary construction features a molded, high-temperature encapsulation with an integrated heat sink for improved thermal management. As a result, the new device maintains the superior electrical characteristics of the Power Metal Strip construction during operation in a variety of high-current applications. Low thermal EMF, a broad operating temperature range of - 65 °C to + 275 °C, and resistance to moisture, vibration, thermal and mechanical shock ensure reliable operation. The WSR5's proprietary Power Metal Strip design features all-welded construction, solderable terminations, and a solid metal alloy resistive element.

The WSR5's high-power capability in a compact package enables designers to shift away from leaded resistors to a surface-mount solution, and thus to create smaller, lower-cost, and/or higher-performing end products. When used to replace through-hole current-sensing resistors, the WSR5 reduces manufacturing placement costs while allowing for total solder reflow assembly. Per-device costs also are further reduced by the elimination of secondary operations such as lead forming and trimming.

Provided in 24-mm tape-and-reel form, samples and production quantities of the WSR5 are available now, with a lead time of 6 to 8 weeks for larger orders.

Vishay Intertechnology, Inc., a Fortune 1,000 Company listed on the NYSE (VSH), is one of the world's largest manufacturers of discrete semiconductors (diodes, rectifiers, MOSFETs, optoelectronics, and selected ICs) and passive electronic components (resistors, capacitors, inductors, sensors, and transducers). These components are used in virtually all types of electronic devices and equipment, in the industrial, computing, automotive, consumer, telecommunications, military, aerospace, and medical markets. Its product innovations, successful acquisition strategy, and "one-stop shop" service have made Vishay a global industry leader. Vishay can be found on the Internet at

Power Metal Strip is a registered trademark of Vishay Intertechnology, Inc.

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