Vishay has débuted a new high-precision Bulk Metal Foil four-resistor network that offers excellent load life, load life ratio and shelf life stability characteristics.
The hermetically sealed SMNH resistor network features a load life stability of 0,005% at 0,1 W per resistor at +70°C for 1000 hours and a load life stability ratio of 50 ppm. In addition, the device features excellent shelf-life stability per resistor of 2 ppm and a shelf life stability ratio of 1 ppm for at least six years. In addition to these tight stability characteristics, the SMNH combines a low absolute TCR of ±2 ppm/°C from -55°C to +125°C, +25°C ref., TCR tracking of ±0,5 ppm/°C, and a tolerance match down to 50 ppm in an 8-pin, surface-mount, ceramic gull wing package.
The resistor network combines four independent Bulk Metal Foil resistors in a single surface-mount package. Offering better performance and more efficient use of board space than discrete resistors and matched sets, the device can be used independently or as divider pairs. The ceramic gull wing package offers the advantages of electrical isolation on the underside of the device and high heat dissipation capability, while the network’s hermetic sealing enhances its already inherently stable environmental performance.
With a wide resistance range of 5 Ω to 33 kΩ, the SMNH offers resistance ratios from 1:1 to 100:1. Vishay Foil resistors are not restricted to standard values, and can be specified to ‘as-required’ values (eg, 1,2345 kΩ vs. 1 kΩ) at no extra cost or delivery time. While other resistor technologies can take several seconds or even minutes to achieve a steady-state thermal stabilisation, the SMNH network has a short thermal stabilisation time of <1 s, and a 1,0 ns rise time, effectively without ringing. The device features a power rating of 0,4 W (or 0,1 W per resistor) at 70°C, current noise of less than -40 dB, and a voltage coefficient of <0,1 ppm/V. The network offers a non-inductive, non-hot-spot design and high ESD immunity, withstanding electrostatic discharges up to 25 kV for increased reliability.
All the resistors inside the SMNH are produced from the same proprietary Bulk Metal Foil alloy, of known and controllable characteristics. The alloys, which are not deposited by conventional techniques, are approximately 100 times thicker than conventional evaporated films. Vishay resistor elements are then photo-etched into a variety of resistive patterns in such a way that the resistance is adjustable to a standard tolerance of 0,01%, and to 0,005% by request.
For more information contact EBV Electrolink, +27 (0)21 402 1940, capetown@ebv.com, www.ebv.com
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