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Oil-Filled Device Provides Resistance to Humidity for High-Precision Applications
MALVERN, Pa. — June 27, 2008 — To meet the demand for long-term performance in high-reliability applications, Vishay Intertechnology, Inc. (NYSE: VSH) today introduced the new hermetically sealed VHP203
miniature ultra-high-precision Z-Foil resistor. The new device provides a low 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, an excellent power coefficient (“ΔR due to self heating”) of ±5 ppm at rated power, a tolerance of ±0.001 % (10 ppm), and a load-life stability of ±0.002 % (20 ppm).
The oil-filled, hermetically sealed VHP203
resistor represents an industry breakthrough. The hermetic sealing eliminates the ingress of moisture and oxygen, while the oil acts as a thermal conductor, thus eliminating the long-term degradation experienced by elements in unsealed resistors, while at the same time allowing the device to accept short periods of overload without degradation.
The new 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.
With accuracy of ± 0.001 % and long-term shelf life of 2 ppm for at least 10 years, the new device is optimized for high-precision instrumentation amplifiers, bridge networks, and differential amplifiers in high-accuracy products where humidity resistance and high stability are required. Typical end products include laboratory, metrology, measurement, medical, and test equipment.
allows designers to utilize much better performance and specifications all together in one package. The VHP203
has a load-life stability of ±0.002 % for 2000 hours at +60 °C at 0.1 W; a power rating of 0.3 W at +25 °C; a low voltage coefficient of < 0.1 PPM/V; current noise of < -40 dB; and thermal EMF of 0.05 μV/°C. The resistor offers a fast rise time of 1.0 ns without ringing and features a non-inductive (< 0.08 μH), non-capacitive design.
The device offers the utmost in ESD immunity, withstanding electrostatic discharges exceeding 25 kV, for increased reliability. Within a resistance range of 10 Ω to 150 kΩ, any value at any tolerance is available through calibration at no additional cost.
Samples and production quantities of the VHP203
ultra-high-precision resistor 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.