Based on many years of proven manufacturing processes for chip resistors, SRT Resistor Technology GmbH can now offer chip resistors that are suitable for high temperature applications up to the 300°C range. This new possibility results from the fact that these chip resistors contain no organic material and no nickel and tin in the contact structure. Rather, the outer contact of these resistors consists of a high-quality PtAg alloy, which, like the resistor layer, is baked at about 850°C and sintered to the ceramic substrate.

When processing components for elevated operating temperatures, the problem arises that the choice of solders for the temperature range up to 300 degrees is very limited. However, apart from resistance to high temperatures, the contact of these chip resistors has the property that it can be reliably contacted with conductive adhesives. Thus, the epoxy- or polyimide-based conductive adhesives available on the market provide a rational and reliable interconnection technique.

Currently, the SRT resistor series CHR, CHS and CHM are available as high-temperature versions CHR-HT, CHS-HT and CHM-HT.

The general data applicable to all these types with regard to high temperature application are summarized in the data sheet "High Temperature Chip-R.pdf". This, as well as the individual data sheets for these types, can be downloaded from our homepage under Downloads. Compared to the resistors for applications in the normal temperature range, with the products for high temperature an appropriate pre-aging is carried out before the final measurement, in order to anticipate possible drift changes of the resistors.

These type series of chip resistors, in addition to the possibility of application at elevated temperatures, also have the characteristic of being non-magnetic. Standard chip resistors contain a nickel layer in their contact system, which has ferromagnetic properties. In applications in high magnetic fields, such as in computer tomographs, this magnetic property causes not only the occurrence of mechanical forces on the components, but also a serious disturbance of the electronic useful signal. This property has opened up a new field of application for such chip resistors.