Expanded SMD resistor portfolio for medium and lower performance requirements

Closing a gap in its range, Isabellenhütte now offers resistors for medium and lower performance requirements in the SMD-mountable precision and power resistor segment. The existing SMx and VMx SMD series include resistors for high-end applications. The new CMx series meets the market demand for reduced technical performance and is available in the standard sizes 2512, 2010 and 1206. The new resistors work in the temperature range from -65 to 170 °Celsius, making them suitable for both industrial applications and as components in vehicle applications. In the automotive sector, they comply with the AEC-Q200 specifications and fulfil the criteria of RoHS 2011/65/EU. Low TCR across the entire range of temperatures Despite their reduced resistance, the CMx resistors offer the same quality features as other Isabellenhütte resistors, such as high long-term stability, optimum temperature coefficients and high load capacity. The TCR of the entire range is below 75ppm/K, says the company. “Unlike many other resistors in the lower performance range, our low temperature coefficient applies to the whole resistance range and load capacity is guaranteed, even when the temperature of the contact points is high,” said Eugen Löwen, application management component sales, Isabellenhütte. The TCR of resistors made by other manufacturers varies across the value range and nominal load depends on the ambient temperature. However, contact point temperature is the key point of reference for applications. Together with the load and stability of the component, it is decisive. Users also benefit from the long-term stability of Isabellenhütte’s technology. Long-term stability after 2,000 hours of operation is excellent, with deviation of less than 1.0 per cent from the original values for all sizes. “While other manufacturers can match that performance, few can achieve the contact point temperatures offered by Isabellenhütte resistors, for example 100C,” added Eugen Löwen. All three versions have a very high load capacity. The CMS has resistance of 10 to 500mohm at a nominal capacity of 2W. The CMP also has resistance of 10 to 500mohm with load capacity of 1W. The CMK offers resistance of 10 to 100mohm and a load capacity of 0.5W.