SOURCE: Vishay Precision Group

Vishay Precision Group

November 23, 2010 13:38 ET

VPG's New Ultra-High-Precision Bulk Metal® Z-Foil Hybrid Chip Resistors Are Industry's First to Offer Low Typical TCR of 0.05 ppm/Deg. C From 0 to 60 Deg. C, Tolerance to 0.005%, and Load-Life Stability of 0.01% for 10,000 Hours

MALVERN, PA--(Marketwire - November 23, 2010) -  Vishay Precision Group, Inc. (NYSE: VPG) announced that its Vishay Foil Resistors division has released a new family of ultra-high-precision Bulk Metal® Z-Foil hybrid chip resistors. Offering an order of magnitude improvement over other chip resistors for hybrid applications, the new V5X5Z, V15X5Z, and V15X10Z are the industry's first to offer low typical TCR of 0.05 ppm/deg. C from 0 to 60 deg. C and 0.2 ppm/ deg. C from -55 to +125 deg. C, +25 deg. C ref., TCR tracking to 0.5 ppm/deg. C, factory supplied resistance tolerances to 0.01% (user trimmable to 0.005%)‌, and load-life stability of 0.01% at +70 deg. C for 10,000 hours at rated power.

For hybrid applications, the new V5X5Z, V15X5Z, and V15X10Z resistors are available either factory trimmed to exact resistance values, or ready for user trimming after mounting with either gold or aluminum wire bonds. Vishay Foil Resistor chips can be trimmed after installation while monitoring the important output parameters of the circuit. Once calibrated, the value is permanently set and remains unaffected by shock, vibration, and temperature variations (external and internal). These capabilities bring high stability and reliability to system performance without any compromise between accuracy, stability, and speed. To acquire a precision resistance value, the Bulk Metal Foil chip is trimmed by selectively removing built-in "shorting bars." To increase the resistance in known increments, marked areas are cut, producing progressively smaller increases in resistance. This method reduces the effect of "hot spots" and improves the long-term stability of the hybrid chips.

The Vishay Foil Resistor precision trimming system allows for adjustment to precise resistance values without concern over mechanical override and control problems encountered in laser or air-abrade trimming of solid geometry resistance patterns. This ability to trim resistor chips to tolerance levels never before available to hybrid manufacturers gives project managers the ability to increase the value-added level of their hybrid services and retain more profit within the facility. Instead of buying precision resistors in separate packages or modules -- which require additional PCB real estate -- and integrating them into a system, the project manager can utilize Vishay Foil Resistors' precision chips or matched sets to manufacture the entire hybrid circuit in-house. The devices also eliminate the need to "pin out" for precision resistor requirements, as the precision resistors are part of the hybrid microcircuit design.

The V5X5Z, V15X5Z, and V15X10Z offer a resistance range from 5 ohms to 60 kilohms. The resistors are not restricted to standard values, and specific "as required" values (e.g. 1.234 kilohms vs. 1 kilohm) can be supplied at no extra cost or delivery time. The devices feature power ratings from 50 mW to 150 mW at +70 deg. C, a rise time of 1 ns, with effectively no ringing, thermal stabilization time of less than one second (nominal value achieved within 10 ppm of steady state value), short-time overload 0.02% or less, and current noise of less than -40 dB.

In analog circuits, the most important factor is the end-of-life tolerance, which is part of the stability and, to a lesser extent, the initial tolerance. Foil hybrid Z-Foil chips provide stabilities well under the maximum allowable drift required by customers' specifications through thousands of hours of operation under harsh conditions such as the extreme temperatures and radiation-rich environments of down-hole oil well logging applications; in the frigid arctic; under the sea; or in deep space. All Bulk Metal Foil resistors receive stabilization processing such as repetitive short-term power overloads to assure reliable service through the unpredictable stresses of extreme operation.

Offering the utmost in ESD immunity, the V5X5Z, V15X5Z, and V15X10Z withstand electrostatic discharges at least to 25 kV, for increased reliability, and offer a non-inductive (less than 0.08 microhenries), non-capacitive design. Hybrid chips with Z-Foil are also available for high-temperature applications above +220 deg. C. Applications Engineering assistance is also available to help with custom designs for multiple resistors on a single chip. Such services, for example, have produced up to 16 resistors within 0.01% tolerance and TCR tracking of less than 0.1 ppm/deg. C on a single quarter-inch square chip. Contact VPG for more details.

Samples and production quantities of the new hybrid chip resistors are available now, with lead times of five days for samples and three weeks for standard orders.

Further information about the V5X5Z, V15X5Z, V15X10Z, and other Vishay Foil Resistors products is available at www.foilresistors.com. Follow Vishay Foil Resistors at http://twitter.com/VishayFoil.

This press release was E-mailed to editors on October 11, 2010.

About Vishay Foil Resistors
Vishay Foil Resistors is a division of Vishay Precision Group, producing the most precise and stable type of resistors available. Our portfolio comprises products in a variety of resistor configurations and package types to meet the needs of a wide range of applications: discrete resistors and resistor networks in surface mount and through-hole (leaded) configurations; customized chip resistor networks; precision trimming potentiometers; and discrete chips for use in hybrid circuits. Our foil resistors and current sensors are used in applications requiring a high degree of precision and stability, such as in medical testing equipment, high performance audio equipment, precision measuring instruments and aerospace and military applications.

About Vishay Precision Group
Vishay Precision Group produces sensors based on precision resistive foil technology, and sensor-based systems. We provide vertically integrated products and solutions for multiple growing markets in the areas of stress, force, weight, pressure and current measurements. As a spin-off from Vishay Intertechnology, our decades-long track record encompasses innovations in foil precision resistors, which we invented, current sensors, and strain gages, which have served as a foundation for our more recent expansion into strain gage instrumentation, load cells and transducers, weighing modules and complete systems for process control and on-board weighing. Vishay Precision Group may be found on the Internet at www.vishaypg.com.

Link to product datasheet:
http://www.vishaypg.com/doc?63189 

Link to product photo (click on "ALL SIZES" for hi-res version):
http://www.flickr.com/photos/47034298@N02/5059921485/

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