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Vishay’s New VPR220Z Ultra-High-Precision Z-Foil Resistor Features a Low Absolute TCR of ±0.05 ppm/°C, Tolerance to ±0.01 %, and Power Rating to 8 W
Device Provides Load-Life Stability of ±0.005 % (50 ppm), Instantaneous Thermal Stabilization Time, and 5-Ω to 10-kΩ Resistance Range With Any Value at Any Tolerance Available at no Additional Cost
MALVERN, Pa. — 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 ±0.05 ppm/°C from 0 °C to +60 °C and ±0.2 ppm/°C from -55 °C to +125 °C, +25 °C ref., a power rating up to 8 W at +25 °C per MIL-PRF-39009 (1.5 W in free air), an excellent power coefficient ("ΔR due to self heating") of ±5 ppm at rated power, and a tolerance of ±0.01 %.
The new VPR220Z resistor is built on Vishay’s "Z- Foil" technology, which provides a significant reduction of the resistive component’s 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 % (50 ppm) for 2000 hours at +25 °C; a low voltage coefficient of <0.1 PPM/V; current noise of <-42 dB; and thermal EMF of 0.05 μV/°C. The resistor features a non-inductive (<0.08 μH), 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 25 kV, for increased reliability. Within a resistance range of 5 Ω to 10 kΩ, 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.
Vishay Precision Group Inc. has ceased to be a subsidiary of Vishay Intertechnology Inc. and is an independent publicly owned company.