Resistor features non-inductive, non-capacitive design.

Press Release Summary:

Rated up to 8 W at +25°C per MIL-PRF-39009, Model VPR220Z provides industrial-grade absolute TCR of ±0.05ppm/°C from 0-60°C and ±0.2ppm/°C from -55 to +125°C, power coefficient of ±5 ppm at rated power, and tolerance of ±0.01%. Resistor features almost instantaneous thermal stabilization time of less than 1 sec and 1.0 nm rise time without ringing. Optimized for military and space applications, device withstands 25 kV ESD and has resistance range of 5 W to 10 kW.

Original Press Release:

Vishay's New VPR220Z Ultra-High-Precision Z-Foil Resistor...

Features a Low Absolute TCR of ±0.05ppm/°C, Tolerance to ±0.01%, and Power Rating to 8W

Device Provides Load-Life Stability of ±0.005% (50ppm), Instantaneous Thermal Stabilization Time, and 5-W to 10-kW Resistance Range With Any Value at Any Tolerance Available at no Additional Cost

MALVERN, PENNSYLVANIA - August 1, 2008 - Vishay Intertechnology, Inc. (NYSE: VSH) today introduced the new VPR220Z ultra-high-precision Z-Foil resistor. The new device provides an industrial-grade absolute TCR of ±0.05ppm/°C from 0°C to +60°C and ±0.2ppm/°C from -55°C to +125°C, +25°C ref., a power rating up to 8W at +25°C per MIL-PRF-39009 (1.5W in free air), an excellent power coefficient ("ΔR due to self heating") of ±5ppm at rated power, and a tolerance of ±0.01%.

The new VPR220Z resistor is built on Vishays "Z-Foil" technology, which provides a significant reduction of the resistive components sensitivity to ambient temperature variations (TCR) and applied power changes (PCR). Z-Foil improves stability by an order of magnitude compared to any other resistor technology, allowing designers to guarantee a high degree of accuracy in fixed-resistor applications.

The VPR220Z allows designers to achieve much better performance by combining a range of ultra-high-precision specifications in a single device. These specifications include a load-life stability of ±0.005% (50ppm) for 2000 hours at +25°C; a low voltage coefficient of <0.1PPM/V; current noise of <-42dB; and thermal EMF of 0.05µV/°C. The resistor features a non-inductive (<0.08µH), non-capacitive design, and a 4-Kelvin connection for increased accuracy.

While other resistor technologies can take several seconds or even minutes to achieve a steady state thermal stabilization, the VPR220Z has an almost instantaneous thermal stabilization time of <1 second, and a nearly immeasurable 1.0-ns rise time without ringing. Optimized for military and space applications according to EEE-INST-002 screening, the resistor is built to handle unconventional environmental conditions with minimal drift.

Offering the utmost in ESD immunity, the device withstands electrostatic discharges exceeding 25kV, for increased reliability. Within a resistance range of 5W to 10kW, any value at any tolerance is available through calibration at no additional cost. Featuring the TO-220 package, the VPR220Z is offered with lead (Pb)-free and tin/lead alloy finishes, and is available in a surface-mount version, the VPR220SZ. Typical applications for the resistor will include dc-to-dc converters, precision current sensing, feedback circuits, and precision amplifiers in test and measurement instrumentation, medical systems, satellites and aerospace systems, commercial and military avionics, and weapons systems.

Both the VPR220Z and VPR220SZ ultra-high-precision resistors are available now, with lead times of 72 hours for samples, and three weeks for standard orders. Pricing for U.S. delivery starts at $7.00.

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, transistors, and 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 ability to provide "one-stop shop" service have made Vishay a global industry leader. Vishay can be found on the Internet at

Bulk Metal is a registered trademark of Vishay Intertechnology, Inc.

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