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Performance of a RoHS Compliant Resistor System from 50 milli/ohm to 1 meg /ohm
Keywords: Resistor, RoHS Compliant, Thick Film
The RoHS Directive has limited the use of a variety of substances in materials for electronics. In thick film materials we are mainly concerned with lead and cadmium. This paper establishes the properties of a RoHS compliant thick film resistor system with values from 50m/ to 1 M/. It is shown that this resistor system meets current RoHS requirements in regards to lead and cadmium content. Detailed data is presented with regards to TCR, process stability, and power handling. The material system meets current thick film resistor material requirements. An important aspect of a thick film resistor system is how it interacts with the conductors and dielectrics in the multilayer system. Data is reported showing the compatibility of this resistor system with Heraeus lead and cadmium free conductor and dielectric systems. Test results are presented on conductor and dielectric compatibility, TCR, resistance, aspect ratio performance, and processibility of the system. The RoHS Directive has restricted the use of lead and cadmium in thick film materials systems. The technology is developed and available to use a RoHS compliant thick film system including high performance resistors to manufacture thick film microelectronic circuits.
Jim Wood, Technical Service Engineer
Heraeus Thick Film Division
West Conshohocken, PA

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