Thick film resistors are the most commonly used resistors in electrical and electronic devices. Thick film resistors are usually found as chip resistor (Surface Mount Dimension or SMD), and have the lowest cost compared to other technologies. At Micro Precision Technologies, we screen resistors directly onto our customers’ circuits.

The resistive layer is printed onto a substrate at 850°C. The substrate is often 96% to 99% alumina ceramic. After the firing of the paste on the carrier, the film becomes glasslike, which makes it well protected against moisture. Unlike thin film, the thick film process is additive. This means that the resistive layers are added sequentially to the substrate to create the conducting patterns and resistance values. They can also be laser trimmed to exact tolerances of your design.

Advantages of thick over thin film technology are not only lower cost, but also the ability to handle more power, provide a wider range of resistance values and withstand high surge conditions.

OHMS per Square

1 10 100 1K 10K 100K 1M 10M
TCR (PPM/C) Typical 0 ± 300 0 ± 200 0 ± 100 0 ± 100 0 ± 100 0 ± 100 0 ± 100 0 ± 100
Max Rated Power Dissipation mW/mm2 885 900 600 625 1000 120 22 10

Standard trim tolerances are 1% through 10%. In some cases .05%

Why Micro Precision Technologies

  • Small Lot Friendly
  • Consigned or Full Turnkey Assemblies
  • Class 5000 Cleanroom for Assembly (0.5 micron per cubic foot)
  • Class 100 Cleanroom for Pre-Cap Inspection (0.5 micron per cubic foot)
  • ISO-9001:2008 Certified
  • MIL-PRF-38534 Class H Qualified
  • QML-38534 Listed

Contact Us to talk to an engineer about your hybrid assembly today.