Malvern, Pa. Vishay Intertechnology, Inc. has released three new high-precision resistor arrays that provide an exceptionally low combined relative error of less than 0.03% in sets of up to eight resistors of varying ohmic values.
These PRA 100, PRA 135 and PRA 182 resistor arrays may be used to replace more expensive matched resistors for applications that require precision sets of resistor elements. Applications include instrumentation, calibration, and data conversion systems.
The new Vishay Thin Film PRA arrays provide a tight TCR of 10 ppm/°C, TCR tracking of 1 ppm/°C, and a ratio tolerance as tight as 0.01%. The PRA 100 offers a resistance range of 100Ω to 200 KΩ, while the PRA 135 is available with a resistance range of 100Ω to 300 KΩ. The PRA 182 supplies a resistance range of 100Ω to 1 MΩ. The power rating for all three resistors is 100 mW at 70°C, with limiting voltages of 35 V, 75 V, and 100 V, respectively. The devices offer very low noise of ≤-35 dB and a low voltage coefficient of ≤0.01 ppm/V.
The PRA devices are available in 1-mm, 1.35-mm, and 1.82-mm pitches, with widths of 1.6 mm, 1.85 mm, and 3 mm, and a height profile of 0.38 mm. Each array is available with pre-tinned over a nickel barrier. Resistance values may be specified differently on a given network (R max./R min. up to 300) with no tooling charge.
The company said an ultra-stable passivated nichrome resistive layer, high-quality contacts between the resistive and conductive layers, and a proprietary patterning and laser trimming technique eliminate the need for digital drift compensation, which simplifies design and enables the use of a smaller footprint.
Samples of new high-precision resistor arrays are available now, with lead times of six to ten weeks for production quantities. Pricing for U.S. delivery ranges from approximately $2.00 for a two-resistor array up to $10.00 for an eight-resistor array.
Call (33) 4 93 37 2950