MALVERN, PA--(Marketwire -07/18/12)- Vishay Precision Group, Inc. (VPG) today announced that its Vishay Foil Resistors (VFR) brand has introduced a high-precision Z-Foil surface-mount current sensing chip resistor with low TCR of 0.2 ppm/ degrees C typical from -55 degrees C to +125 degrees C, +25 degrees C ref., tolerances to 0.5%, and load-life stability to 0.015% at 70 degrees C for 2,000 hours at rated power. Ideal for current measurement in unconventional environmental conditions, including the extremely high temperatures and radiation-rich environments of down-hole oil exploration and well logging, or the deep-sea underwater repeaters in cross-ocean communications, the VCS1610Z features PCR (change in resistance due to self-heating) of 5 ppm at rated power and a four-terminal Kelvin configuration for increased accuracy.
The VCS1610Z offers a power rating of 0.25 W at +70 degrees C, thermal stabilization time of less than 1 s (nominal value achieved within 10 ppm of steady state value), and resistance range from 0.3 to 10 ohms. Any resistance value within this range is available at any tolerance with no additional cost or lead time effect. The resistor features a rise time of 1.0 ns with effectively no ringing, short time overload of less than 0.005%, current noise of 0.010 microvolts rms/V of applied voltage (less than -40 dB), and a voltage coefficient of less than 0.1 ppm/V. The VCS1610Z is available with lead (Pb)-free gold or tin/lead termination options.
Providing the utmost in ESD immunity, the device withstands electrostatic discharges to at least 25 kV for increased reliability and offers a non-inductive (less than 0.08 microhenries), non-capacitive design. The Bulk Metal® Z-Foil technology of the VCS1610Z provides a significant reduction of the resistive component's sensitivity to ambient temperature variations (TCR) and applied power changes (PCR). This allows designers to guarantee a high degree of stability and accuracy in fixed-resistor applications. In addition, the resistor's design results in a very low thermal EMF of 0.05 microvolts/ degrees C typical, which is critical in low-ohmic current sensing resistors used in DC circuits.
In order to select the resistor technology most appropriate to their applications, designers must take into account all normal and extraordinary stresses the resistor will experience. In addition, they must consider the impact, in terms of cost and reliability, when it becomes necessary to add additional compensating circuitry when inadequate resistors are selected. The stability of Bulk Metal Z-Foil resistors, as well as the other basic advantages apparent in their specifications, will not only provide unequalled performance in the circuit, but also will eliminate all the costs associated with extra compensation circuitry. With the VCS1610Z, only a minimal shift in resistance value will occur during its entire lifetime. Most of this shift takes place during the first few hundred hours of operation, and virtually no change is noted thereafter.
"The physics of the Bulk Metal resistor are fairly simple to describe, but the realization of a foil resistor requires advanced expertise in multiple disciplines. These include metallurgy; high-temperature adhesives; very fine-line photolithography; fine etching and passivation; conductor path design; stress analysis and its thermal components; strain-relieving encapsulates and terminations; and much more," said Yuval Hernik, senior director of application engineering for Vishay Foil Resistors.
In addition, Mr. Hernik cautions that, as with all purchases of precision electronics in today's world, buyers must be vigilant in order to prevent unreliable counterfeit resistors from entering their warehouses and electronic systems. "It is unfortunate that fraud has penetrated the electronics industry. But this is a fact we all have to live with, and our only protection is unremitting vigilance and purchasing only from VFR or its authorized distributors and catalog houses."
Samples and production quantities of the VCS1610Z are available now, with lead times of five working days for samples and eight weeks for standard orders.
About VPG Foil Resistors
Distinguished by the premier brands Vishay Foil Resistors, Powertron, and Alpha Electronics, VPG Foil Resistors is part of Vishay Precision Group (VPG), producing the most precise and stable resistors available. The portfolio comprises products in a variety of resistor and package configurations to meet the needs of a wide range of applications: 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. The foil resistors and current sensors 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.
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.vishaypg.com.
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