Vishay has released new 2-, 3- and 4-resistor voltage dividers and resistor networks in both Bulk Metal Foil and Z-Foil versions. The resistor arrays come in standard configurations, but with custom values and tolerances for all 13 possible schematic variations of two, three and four resistors.
For applications requiring maximum precision, the Z-Foil devices feature 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., TCR tracking to ±0,1 ppm/°C, matching tolerance to 50 ppm and PCR (R due to self heating) of 5 ppm at rated power. For a low thermal EMF of 0,05 μV/°C, the leads that emerge from the arrays’ packages connect directly to the resistance elements or an internal PC board. In addition, each element offers a wide resistance range from 1 Ω to 100 kΩ, and can be combined for even higher values. Finally, the elements retain all the advantages of discrete Bulk Metal Z-Foil resistors, plus the ability to be further sorted for TCR track and absolute matching before encapsulation.
The Z-Foil resistor arrays feature power ratings of 0,3 W per element at +125°C and resistance ratio stability to 0,001% at 0,05 W. The resistor networks offer a rise time of 1 ns, with effectively no ringing, a thermal stabilisation time of <1 s (nominal value achieved within 10 ppm of steady state value), current noise of 0,010 μVrms/V of applied voltage (<-40 dB), a voltage coefficient of <0,1 ppm/V and a non-inductive (<0,08 μH), non-capacitive design.
The networks are optimised as voltage dividers, bridges and attenuators in a wide range of military and aerospace, medical and high-temperature down-hole applications where performance and stability are important, including differential amplifiers, gain-defining resistors in digital voltmeters, ratio arms in bridge circuits, fuel metering and fire control instrumentation, binary ladders, and linear and linear-summing networks.
For applications that require only near-maximum stability, the standard foil resistor arrays feature a TCR of ±2 ppm/°C from -55°C to +125°C, +25°C ref., TCR tracking to ±0,5 ppm/°C and matching tolerance to 50 ppm. The devices offer a low thermal EMF of 0,05 μV/°C and a resistance range from 1 Ω to 150 kΩ. The standard foil resistor arrays feature power ratings of 0,3 W at
+125°C for resistance values to 100 kΩ, and 0,2 W for resistance values above 100 kΩ.
For more information contact Marian Ledgerwood, Future Electronics, +27 (0)21 421 8292, [email protected], www.futureelectronics.com
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