MALVERN, Pa. — Jan. 27, 2014 — To meet the growing demand for precise, stable, and reliable resistors that can operate in harsh environments, Vishay Precision Group, Inc. (NYSE: VPG) today announced that its Vishay Foil Resistors brand (VFR) has introduced a new ultra-high-precision through-hole Z-Foil resistor designed for high-temperature applications up to +200°C. The Z201HT offers low TCR ±1 ppm/°C nominal from –55°C to +200°C, +25°C ref.; tight tolerances to ±0.01%; and load-life stability to 0.1% after 1000 hours of rated power at 200°C.
The Z201HT is optimized for a wide variety of high-temperature applications, including geothermal measuring equipment, turbine engine control, and environmental test chambers in military, industrial, automotive, and down-hole drilling systems. Many analog circuits in these 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 high-temperature applications, the most important factor is the end-of-life tolerance, and to a lesser extent, the initial tolerance. The Z201HT provides stabilities well under the maximum allowable drift required by customers’ specifications, through thousands of hours of operation under harsh conditions. In addition, the device features a special silicon-coated design without molding or encapsulation, helping to reduce signal distortion and increase clarity in signal processing.
"Resistors are the passive building blocks of an electrical circuit, which is why it’s so important that Bulk Metal Foil technology provides much more control over element formation and stability than thick film, metal film, or thin film technologies do," said Yuval Hernik, senior director of application engineering for VFR. "When the application requires stability over time and load, initial accuracy, minimal change with temperature of more than 175°C, resistance to moisture, and a number of other characteristics, only Vishay Foil Resistors have all the attributes needed."
The Z201HT offers a resistance range from 10 Ω to 100 kΩ, with any conceivable ohmic value within this range — to six digits — available with no additional cost or lead time effect. The resistor features rated power to 0.1 W at +200ºC, a rise time of 1 ns with effectively no ringing, a thermal stabilization time of < 1 s (within 10 ppm of steady state value), current noise of ≤0.010 μVrms/V of applied voltage (< -40 dB), and a voltage coefficient of < 0.1 ppm/V.
The Z201HT products receive stabilization processing such as repetitive thermal cycling and short‐term power overloads to assure reliable service through the stresses of extreme operation
Offering the utmost in ESD immunity, the Z201HT withstands electrostatic discharges of at least 25 kV, for increased reliability, and offers a non-inductive (< 0.08 μH), non-capacitive design. The device is available with RoHS-compliant, lead (Pb)-free terminations or tin/lead-plated terminations
Samples and production quantities of the Z201HT are available now, with lead times of six weeks for large orders.
About Vishay Precision Group
Vishay Precision Group (VPG) is an internationally recognized designer, manufacturer and marketer of: components based on its resistive foil technology; sensors; and sensor-based systems specializing in the growing markets of stress, force, weight, pressure, and current measurements. VPG is a market leader of Foil Technology Products, providing ongoing technology innovations in precision foil resistors and foil strain gages, which are the foundation of the Company’s Force Sensors Products and its Weighing and Control Systems. The product portfolio consists of a variety of well-established brand names recognized for precision and quality in the marketplace. To learn more, visit VPG at www.foilresistors.com.
About VPG Foil Resistors
VPG Foil Resistors, a part of Vishay Precision Group (VPG), produces the most precise and stable resistors available. Distinguished by the premier brands Vishay Foil Resistors, Powertron, and Alpha Electronics, the VPG Foil Resistors portfolio includes discrete resistors and resistor networks in surface mount and through-hole (fixed-lead) configurations; customized chip resistor networks; precision trimming potentiometers; and discrete chips for use in hybrid circuits. These devices are used in applications requiring a high degree of precision and stability, such as in medical testing equipment, semiconductor equipment, precision measuring instruments, aerospace, and military applications. To learn more, visit www.vishayfoilresistors.com
Bulk Metal is a registered trademark of Vishay Precision Group, Inc.