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New Design Boosts VPG's RCK and S Series Bulk Metal® Foil Resistors to Load-Life Stabilities of ±0.015 % After 10,000 Hours at Full Power and 70 °C
MALVERN, PENNSYLVANIA — August 03, 2011 Vishay Precision Group, Inc. (NYSE: VPG) today announced that its Vishay Foil Resistors division (VFR) has enhanced the RCK and S series of high-precision Bulk Metal® Foil (BMF) resistors. The devices feature an improved design and manufacturing process resulting in improved power dissipation, fast thermal stabilization <1 second, low thermal EMF of 0.05 μV/ °C, resistance tolerance to ±0.005 % (50 ppm), and increased performance in high-moisture, high-temperature, and high-pulse  applications. In addition, the devices are now offered with Improved Performance Testing (IPT) for increased long-term stability under load and other stresses.
The newly advanced structural design of the RCK and S series resistors employs a pre-planned stress compensation that never exceeds Hook's constant for the materials. Therefore, the resistors maintain their molecular-level structural integrity and assure resistance stability throughout the load-life and application environments of the resistor – holding resistance change to less than 0.05 % throughout the planned life of the equipment.
The RCK and S series provide a military-grade typical TCR of ±2.0 ppm/°C from -55 °C to +125 °C, +25 °C ref. The S series is also available in a K-alloy version for TCR down to ±1.0 ppm/°C. The devices provide load-life stability of ±0.005 % (50 ppm) at +70 °C for 2,000 hours at rated power, and can achieve levels of 50 ppm after 10,000 hours when processed through the Improved Performance Testing protocol. The resistors feature resistance values from 0.5 Ω to 1 MΩ, with any resistance value within this range available at any tolerance with no additional cost or lead time effect. The devices are rated for power levels up to 2 W at 70 °C and can withstand electro-static discharges (ESD) in excess of 25 kV. Rise time for the resistors is a nearly immeasurable 1 ns with effectively no ringing. These new benchmark levels of performance provide design engineers with the tools to build circuits not previously achievable. In addition, they reduce costs in the most critical circuits by eliminating the need for corrective circuitry used only for the purpose of stabilizing or iterating accuracy in previous stages of the circuit path.
Devices in the  RCK and S series are built to handle unconventional environmental conditions with minimal drift, making them well suited for military/space applications according to EEE-INST-002 specifications and MIL-PRF 55182. Each resistor undergoes at least one short-time overload of 6.25 times the rated power during the manufacturing process. The devices are designed with a coating and molding compound that provides moisture proofing and mechanical damping, as well as a path for heat dissipation.
The RCK and S series allow designers to achieve much better performance by combining a range of high-precision specifications in a single device. In addition to their low TCR, tolerance, and load-life stability, the resistors offer a low voltage coefficient of <0.1 ppm/V; current noise of 0.010 μVRMS/V of applied voltage (<-40 dB); and a non-inductive (< 0.08 μH), non-capacitive design. The RoHS-compliant resistors are available in matched sets upon request.
Samples and production quantities of the improved RCK and S series are available now, with lead times of five days for prototype  samples, and from  two days to five weeks for standard orders at the catalogue houses (depends on their availability on the shelf). 
Further information about the RCK series, S series, and other Vishay Foil Resistors products is available at www.vishayfoilresistors.com. Follow Vishay Foil Resistors at http://twitter.com/VPGFoil .
About Vishay Foil Resistors
Vishay Foil Resistors is a division of Vishay Precision Group, producing the most precise and stable type of resistors available. The 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. 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. Vishay Precision Group may be found on the Internet at www.vishaypg.com.