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VPG Adds New Ultra-High-Precision Bulk Metal® Z-Foil Resistors With Low Typical TCR of ±0.05ppm/°C (0°C to +60°C), Tolerance and Load-Life Stability of ±0.005% (50ppm), and Thermal EMF of 0.05μV/°C
Qualified to EEE-INST002 and MIL-PRF 55182 for Military, Aerospace, Medical, Industrial, and Weigh System Applications, New Z204, Z205, and Z206 Resistors Offer Resistance Range From 10Ω to 600kΩ With Rated Power to 1W at 125°C
MALVERN, PENNSYLVANIA — Sept. 24, 2010 — Vishay Precision Group, Inc. (NYSE: VPG) today announced that its Vishay Foil Resistors division has extended the Z Series of ultra-high-precision Bulk Metal® Z-Foil resistors with three new devices that provide very low TCR of ±0.05 ppm/°C from 0°C to +60°C and ±0.2ppm/°C from -55°C to +125°C, +25°C ref., tight tolerances of ±0.005% (50ppm), and a load life stability of ±0.005% at 70°C for 2,000 hours or to ±0.015% at 70°C for 10,000 hours. Qualified in accordance with EEE-INST002 and MIL-PRF 55182, the new Z204, Z205, and Z206 join the previously released Z201 for military/aerospace applications.
The devices released today are the result of a unique concept in resistor manufacturing, starting with a proprietary bulk metal foil cemented to a special ceramic substrate. A resistive pattern is then photoetched into the foil by an ultra-fine technique developed by Vishay Foil Resistors and laser-adjusted to any desired value and tolerance. The Z Series resistors utilize a special trimming method that increases resistance in precise steps, but at positions away from the active grid, so that the etched grid in the active area remains reliable and noise-free.
Because the metals used are not drawn, wound, or mistreated in any way during the manufacturing process, the Bulk Metal Foil resistor maintains all its design, physical, and electrical characteristics of maximum stability and near-zero TCR. These performance characteristics are built into every unit, and do not rely on screening or other artificial means for uniform performance.
The stability of a resistor depends primarily on its history of exposure to temperature. Stability is affected by: changes in the ambient temperature and heat from adjacent components (TCR); destabilizing thermal shock of suddenly-applied power (power TCR); long-term exposure to applied power (load-life stability); and repetitive stresses from being switched on and off. The Z Series has been developed to successfully deal with these factors. Vishay Foil Resistors’ Z-Foil technology provides an order of magnitude reduction in the Bulk Metal Foil element’s sensitivity to temperature changes - both external and internal. This technology provides a low absolute TCR of ± 0.05ppm/°C and a power TCR of 5ppm at rated power.
Over the past few months, there has been considerable growth in the demand for precise, stable, and reliable resistors that can operate in harsh environments, especially at high temperatures. Many analog circuits for industrial, military, aerospace, medical, down-hole, oil well, and automotive applications require passive components such as resistors to have a minimal drift from their initial values when operating above +175°C and in humid environments.
In these applications the most important factor is the end of life tolerance and, to a lesser extent, the initial tolerance. The Z Series provides 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 environment of down-hole oil well logging applications; in the frigid arctic; under the sea; or in deep space. All Z Series resistors receive stabilization processing such as repetitive short-term power overloads to assure reliable service through the unpredictable stresses of extreme operation.
The Z Series offers a resistance range from 10Ω to 600kΩ. Vishay Foil Resistors are not restricted to standard values, and specific “as required” values (e.g. 1.234kΩ vs. 1kΩ) can be supplied at no extra cost or delivery time. Total accumulated change in resistance over life (EOL) for the devices is <0.05%, or better with post manufacturing operations (PMO).
The resistors feature rated power to 1W at +125°C, a rise time of 1ns, with effectively no ringing, current noise of <-40dB, thermal EMF of 0.05μV/°C typical, and a voltage coefficient of <0.1ppm/V. Offering the utmost in ESD immunity, the devices withstand electrostatic discharges of at least 25kV, for increased reliability, and offer a non-inductive (<0.08μH), non-capacitive design. Z Series resistors are available with lead (Pb)-free and tin/lead alloy termination plating
Device Specification Table:
Part Resistance range Max. working voltage Ambient power rating (W)
@ +70°C @ +125°C
Z201 10Ω to 100kΩ 300V 0.6 0.3
Z204 10Ω to 200kΩ 350V 1.0 0.5
Z205 10Ω to 300kΩ 350V 1.5 0.75
Z206 10Ω to 600kΩ 500V 2.0 (to 400kΩ) 1.0 (to 400kΩ)
1.0 (over 400kΩ) 0.5 (over 400kΩ)
Samples and production quantities of the Z Series resistors are available now, with lead times of five days for samples, and three weeks for standard orders.
Further information about the Z Series and other Vishay Foil Resistors products is available at www.foilresistors.com. Follow Vishay Foil Resistors at http://twitter.com/VishayFoil.
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 resistive foil technology, and sensor-based systems. We provide vertically integrated products and solutions for multiple growing markets in the areas of stress measurement, industrial weighing, and manufacturing process control. As a spin-off from Vishay Intertechnology, we have a decades-long track record of innovation in foil precision resistors, which we invented, current sensors, and strain gages, which has served as a foundation for our more recent expansion into strain gage instrumentation, load cells and transducers, load cell modules, and complete systems for process control and on-board weighing. Vishay Precision Group may be found on the Internet at www.vishaypg.com.