Vishay Precision Group Announces New Chip Resistors

Published:2011/9/1 21:53:00 Author:Phyllis From:SeekIC

Vishay Foil Resistors, a division of Vishay Precision Group, announced that it has released a new series of ultra-high-precision Bulk Metal® Z1-Foil wraparound, surface mount chip resistors with extended pads for high-temperature, high-power applications. The new extended pad designs are optimized for applications at temperatures as high as +225°C, and offer improved heat dissipation for high working power to 1,200 mW at +70°C and 330 mW at +200°C.

The series is based on VFR’s next-generation Z1-Foil technology, which provides an order of magnitude reduction in the Bulk Metal Foil element’s sensitivity to temperature compared with the classical Foil while providing long-term stability in high-temperature environments.

FRSH devices offer TCR of ±1 ppm/°C from -55°C to +125°C and ±2.5 ppm/°C from -55°C to +200°C, +25°C ref. The resistors feature exceptional load-life stability to ±0.05% at +200°C for 2,000 hours at working power, long-term stability to ±0.05% at +225°C for 2,000 hours, and tight tolerances to ±0.02%.

The devices’ full wraparound terminations ensure safe handling during the manufacturing process and provide stability during multiple thermal cycling. The devices are also capable of withstanding electrostatic discharges at least to 25 kV without degradation.

The basis of the foil resistor lies in a relatively thick cold-rolled foil that maintains the same molecular structure as the raw alloy in high-temperature conditions. This is because of the foil which must act as a monolithic structure with a fixed and known linear coefficient of expansion over any temperature range the resistor might experience throughout its design life.

Another important element in the resistor’s construction is the adhesive that holds the foil to a flat substrate. It must withstand high- and low-temperature exposure, pulsing power, moisture incursions, shock and vibration, and more, while still securely holding the foil element to the substrate. With these characteristics, the basic technology of foil resistors combines the essential stress compensation that defines the foil technology.

About Vishay Foil Resistors

Vishay Foil Resistors is a division of Vishay Precision Group that concentrates on producing the most precise and stable type of resistors available. Its products include a variety of resistor configurations and package types that available to a wide range of applications such as discrete resistors, resistor networks in surface mount, through-hole (leaded) configurations, customized chip resistor networks, precision trimming potentiometers, and discrete chips for use in hybrid circuits. The 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 (VPG) produces sensors based on precision resistive foil technology, and sensor-based systems. It provides 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, VPG’s decades-long track record encompasses innovations in foil precision resistors, current sensors, and strain gages, which have served as a foundation for VPG’s more recent expansion into strain gage instrumentation, load cells and transducers, weighing modules and complete systems for process control and on-board weighing.

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