Electronic Components Blog

Friday, 13 March 2015 11:18

Isabellenhütte expands its portfolio for medium and lower performance requirements

Isabellenhütte expands its portfolio for medium and lower performance requirements

New CMx SMD resistor series from Isabellenhütte:
High stability, even at low levels of performance

Isabellenhütte now also offers resistors for medium and lower performance requirements in the SMD-mountable precision and power resistor segment, closing a gap in its range. 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 75 ppm/K. “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,” confirms Eugen Löwen, Application Management Sales Components at 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 100 °Celsius,” says Eugen Löwen. All three versions have a very high load capacity. The CMS has resistance of 10 to 500 mOhm at a nominal capacity of 2 watts. The CMP also has resistance of 10 to 500 mOhm with load capacity of 1 watt. The CMK offers resistance of 10 to 100 mOhm and a load capacity of 0.5 watts.

Technical details CMx:

Resistance values  10 to 500 mOhm (CMS, CMP) 
  10 to 100 mOhm (CMK)
 Tolerance  1 % / 5 %
 Temperature coefficient (20-60 °C)  < 75 ppm/K
 Temperature range  -65 °C to +170 °C
 Power rating  2 W (CMS)
   1 W (CMP)
   0.5 W (CMK)
 Internal heat resistance  < 35 K/W (CMS)
   < 50 K/W (CMP)
  < 80 K/W (CMK)
Inductance < 3 nH
Dielectric withstanding voltage 200 V AC/DC
Stability (nominal load) < 1.0 % at TK = 100 °C (CMS)
Deviation after 2.000 hrs < 1.0 % at TK = 120 °C (CMP)
TK = Terminal temperature < 1.0 % at TK = 130 °C (CMK)

Related Solutions

  • E-Bikes Brake detection

    E-bicycles are extremely popular. Whether cutting back on carbon emissions or fuel costs, e-bicycles offer many green advantages with similar comforts of conventional bikes. Simple maneuverability and parking are particularly critical if your every day drive is to a congested city. While e-bicycles have been around since the late 1800’s, recent popularity, government regulations and the advent of new sensor technologies have fueled new improvements.

  • Read your sensing elements directly by using the Smartec UTI

    The Universal Transducer Interface (UTI) is a complete analogue front end for low frequency measurement applications, based on a self-calibrating period-modulated oscillator. Sensing elements can be directly connected to the UTI without the need for extra electronics. Only a single reference element, of the same kind as the sensor, is required. The output is digital and can communicate with any type of micro-controller.

    The UTI provides interfacing for all kind of resistive and capacitive sensors.

  • A position test at very limited space by using a probe

    A position sensor system is the ideal solution for exact measurement and documentation of pin lengths, hole depths etc. This system can be used like a contact probe even in small centers. An integrated potentiometer allows the exact determination of the position of the DUT.

  • Current and voltage measurement in and around hybrid and electric drives

    No matter if you're designing a hybrid, electric or fuel cell powered application - a new development's sustainability always depends on the reliability in every-day use and therefore on controlling its energy flow and consumption permanently. Not every method for measuring current and voltage is able to fulfill each of the difficult requirements. Isabellenhütte has developed the current and voltage measuring module IVT for DC applications in alternative drive concepts based on its experience in the area of car battery management.




  • Isabellenhütte Heusler

    Isabellenhütte is a company rich in tradition. Its roots stretch back over 500 years in metal melting and processing. Today it ranks among the world's leading manufacturers of alloys for thermocouple, resistance alloys as well as low-impedance precision and power resistors, and is setting standards in the sector of precision measurement

Related Blog messages

  • A step forward in measuring temperatures

    The temperature sensor SMT172 has been introduced successfully to the market and is really a stepforward in measuring temperatures. Not only the accuracy of 0.1 °C but also the resolution is better than 0.1 mK. The output is , as expected from Smartec, fully digital. These features and the low power makes the sensor suitable for all kind of “lab on a chip” applications and bioreactors.

  • Ultimate thinness for an NTC thermistor

    The Semitec JT Thermistor is a ultra-thin, high precision radial thermistor with superior electrical insulation. Featuring an ultra-thin 500µm design, the Thermistors of the JT-Series enable designers to measure temperature in very tight spaces such as between the electrodes of battery packs.

  • Standex Meder - Alternative Energy Reed Relays, Sensors, And Magnetics

    Reliable And Energy Efficient Electro-Magnetic Components for Isolation Control and Smart Grid Applications.
    Standex-Meder Electronics, a leading manufacturer of precise, reliable, and longlasting sensors and magnetic components worldwide, provides a range of products for use in the Alternative Energy market. Standex-Meder Electronics offers reed relays and switches that are ideal for high voltage and isolation applications for photovoltaics and solar power. They also serve in efforts for the smart grid and smart metering functions related to measuring utility usage, custom power supply, and distribution magnetic products.