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Resistors boast improved load-life stability

Posted: 29 Sep 2009 ?? ?Print Version ?Bookmark and Share

Keywords:resistor? stability load-life? ESD?

VTAZ resistors

Vishay Intertechnology Inc. has unveiled the improved VTAZ series of ultrahigh-precision Bulk Metal Z-Foil axial-lead resistors with extended power ratings to 1W and resistance values to 300k?.

While typical axial resistors offer a load-life stability of >0.1 percent through a 2,000-hour workload, Vishay's new devices feature an improved load-life stability of 0.005 percent (50ppm) at +70C for 2,000 hours at rated power. For high-precision applications, the resistors offer a low typical TCR of 0.05 ppm/C from 0C to +60C and 0.2 ppm/C from -55 C to + 125 C, +25C ref, and tolerances to 0.01 percent.

The enhanced VTAZ series offers a broad resistance range of 5? to 300k?, power ratings from 0.2W to 1W at + 70 C, and a low voltage coefficient of 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 using 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 - 55C to + 125C 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 costs 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 25kV, for increased reliability, and offer a non-inductive (Samples and production quantities of the VTAZ resistors are available now, with lead times of five working days for samples, and five weeks for standard orders.

For application notes on resistors click here.

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