Axial-Lead Resistors offer power ratings to 1.0 W.
November 10, 2009 -
Bulk Metal® Z-Foil axial-lead resistors of VTAZ series, featuring bulk metal foil element applied to ceramic substrate and etched planar construction, offer power ratings to 1.0 W and standard resistance values from 5 W to 300 kW. Along with low voltage coefficient of less than 0.1 ppm/V, products offer 0.2-1.0 W power ratings at +70°C as well as ±0.005% load-life stability at +70°C for 2,000 hr at rated power. Typical TCR is ±0.05 ppm/°C from 0 to +60°C.
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Original Press release
Vishay Intertechnology, Inc.
63 Lincoln Hwy., P.O. Box 4004
Malvern, PA, 19355 2143
USA
Vishay's Enhanced VTAZ Series of Ultra-High-Precision Bulk Metal® Z-Foil Axial Resistors Offers Power Ratings to 1.0 W, Resistance Values to 300 kOhm, TCR Down to ± 0.05 ppm/°C, and Load-Life Stability of ± 0.005 % (50 ppm) at + 70 °C
Resistors Provide Direct Replacement for Wirewound with Improvement in All Areas, Direct Replacement for Thin Film with Accuracy and Stability
MALVERN, Pa. - Sept. 18, 2009 - Vishay Intertechnology, Inc. (NYSE: VSH) today introduced the improved VTAZ series of ultra-high-precision Bulk Metal® Z-Foil axial-lead resistors with extended power ratings to 1.0 W and resistance values to 300 kW. While typical axial resistors offer a load-life stability of > 0.1 % through a 2000-hour workload, Vishay's new devices feature an improved load-life stability of ± 0.005 % (50 ppm) at + 70 °C for 2000 hours at rated power. For high-precision applications, the resistors offer a low typical TCR of ± 0.05 ppm/°C from 0 °C to + 60 °C and ± 0.2 ppm/°C from ( 55 °C to + 125 °C, + 25 °C ref, and tolerances to ± 0.01 %.
The enhanced VTAZ series offers a broad resistance range of 5 W to 300 kW, power ratings from 0.2 W to 1.0 W at + 70 °C, and a low voltage coefficient of < 0.1 ppm/V. Like all Vishay Foil resistors, the VTAZ devices are not restricted to standard values, and can be supplied with "as required" values (e.g. 1.2345 kW vs. 1 kW) at no extra cost or delivery time.
The resistors feature a unique concept in resistor manufacturing that allows designers to guarantee a high degree of accuracy, precision, and stability in fixed resistor applications. A proprietary Bulk Metal Foil element with known and controllable properties is applied to a special ceramic substrate. A resistive pattern is then photoetched by an ultra-fine technique developed by Vishay. The devices' etched planar construction results in the extremely low and reproducible reactance needed for high-frequency and pulse applications.
In applications requiring precise and stable resistors, TCR needs to be low over the full temperature range of the application. Only Z-Foil resistors, such as the VTAZ series, provide a very low absolute TCR that changes very little over the full temperature range of - 55 °C to + 125 °C and beyond. With Vishay Bulk Metal Foil resistors, a minimal shift in resistance will occur during the first few hundred hours of operation, with a very small and predictable change noted thereafter. Because load-life drift is minimalized in such a predictable and reliable way, control and correction circuitry can be eliminated, thereby saving cost in design, components, assembly and test.
Precision resistors based on BMF and Z-Foil technologies provide the best available specifications for precision, accuracy, and stability, delivering stable performance irrespective of changes in ambient temperature or electrical load and even after a long service life.
Offering the utmost in ESD immunity, the VTAZ devices withstand electrostatic discharges up to 25 kV, for increased reliability, and offer a non-inductive (< 0.08 µH), non-capacitive design. The devices are available with lead (Pb)-free and tin/lead alloy terminations.
Samples and production quantities of the VTAZ resistors are available now, with lead times of 5 working days for samples, and 5 weeks for standard orders.
Vishay Intertechnology, Inc., a Fortune 1,000 Company listed on the NYSE (VSH), is one of the world's largest manufacturers of discrete semiconductors (diodes, rectifiers, MOSFETs, optoelectronics, and selected ICs) and passive electronic components (resistors, capacitors, inductors, sensors, and transducers). These components are used in virtually all types of electronic devices and equipment, in the industrial, computing, automotive, consumer, telecommunications, military, aerospace, and medical markets. Its product innovations, successful acquisition strategy, and "one-stop shop" service have made Vishay a global industry leader. Vishay can be found on the Internet at http://www.vishay.com.
Bulk Metal is a registered trademark of Vishay Intertechnology, Inc.
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