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Thin film chip resistor arrays offered in 073, 074 case sizes

Posted: 09 Dec 2013     Print Version  Bookmark and Share

Keywords:Vishay Intertechnology  chip resistor  instrumentation  aircraft engine 

Vishay Intertechnology Inc. has expanded its PRA series of high-precision thin film surface-mount wraparound chip resistor arrays to the compact 073 and 074 case sizes. The PRA073 and PRA074 claim to be the industry's smallest such devices available with up to eight resistors of different ohmic values, tight tolerance ratios down to 0.01 per cent, and TCR tracking to 1ppm/°C, detailed the firm.

Each of the PRA arrays features a pitch of 0.7mm, with ultra-compact dimensions of 1.4 x 0.75mm for the PRA073 and 1.4 x 1mm for the PRA074 (with two resistors). The devices offer ohmic ranges up to 100kΩ, power ratings to 40mW per resistor at 70°C, and limiting voltages to 40V. The PRA073 and PRA074 both feature tight TCR of 10ppm/°C, very low noise of -35dB or less, and a low voltage coefficient of 0.01ppm/V or less.

The Vishay Sfernice arrays are designed for use in instrumentation, calibration and data conversion systems in aircraft engine controls and flight command computers; precision scales; automatic test equipment; and medical applications. In these end products, the devices save board space and can replace more expensive matched resistors without compromising precision or reliability.

The PRA073 and PRA074 feature a high-stability passivated nichrome resistive layer for a load-life ratio of 0.02 per cent for 1,000 hours at 70°C. With high-quality contacts between the resistive and conductive layers, and a proprietary patterning and laser trimming technique, designs are simplified by eliminating the need for digital drift compensation.

The surface-mount wraparound chip resistor arrays are RoHS-compliant and conform to Vishay "Green" standards. The devices are available with humidity withstand testing to AEC-Q200.

Samples and production quantities of the PRA073 and PRA074 are available with lead times of nine weeks for larger orders.

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