BCcomponents achieved a world-first in the passive component industry when it introduced its range of ultra-precision thin-film Mini-MELF resistors targeted for use in high-accuracy, high-performance applications such as test and measurement equipment, process control instrumentation and aerospace electronics.
The company's UMA 0204 Mini-MELF resistors are available with tolerance values as low as ±0,02% and temperature coefficients as small as 5 ppm/K. These resistors bring the advantages of space-saving surface-mount components to applications where accuracy, stability and lifetime are important design parameters.
Designers can replace existing metal-foil resistors with a smaller and lower-cost thin-film solution, according to the manufacturer. When determining the total error budget for precision resistors, their initial tolerance and temperature coefficient are only part of the story. Designers must also take into account the long-term drift in ohmic value due to ageing. This is particularly important in applications where a very long lifetime is required or where the component cannot easily be replaced. BCcomponents says that this is also an important factor in the automotive electronics industry, where there is an increasing need to build modules that are capable of withstanding ever higher ambient temperatures, but at the same time are required to stay within pre-determined stability and precision requirements.
For a continuous power dissipation of 0,07 W, BCcomponents guarantees its UMA 0204 resistors will drift no more than 1200 ppm (0,12%) during their minimum specified lifetime of 25 years. Even at their maximum rated power dissipation of 0,25 W, long term drift is guaranteed not to exceed 0,3%.
UMA 0204 resistors are available with tolerances ±0,02, ±0,05, ±0,1 and ±0,25%, and temperature coefficients of 5, 10 and 15 ppm/K. The standard range includes all E192 values between 22 W and 221 kW, others on special order.
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