Semitec ET Miniature Epoxy NTC Thermistor

Originally designed for clinical thermometer applications, this small bead NTC thermistor is very versatile and suitable for a wide range of applications.  The fast response time in air of approximately 3.2 seconds, high accuracy and precise format make it a universal choice for low-cost applications.

ET series thermistors are mounted on stiff or flexible lead-wires giving users a choice of rigidity in their application. The ET-1 version has a built-in strain-relief point to help minimise the bead size and thus maximise the speed of response. ET-3H versions have lacquered lead-wires which help to insulate the thermistor and provide environmental protection in heat detector applications.

As well as a wide range of nominal R25 resistance values, ET thermistors can be point-calibrated at 37°C with tolerances of ±1% or less.  Also highly accurate matched R37 resistance groups (with accuracy +/-0.1°C or smaller) can be produced to help minimise unit cost whilst maximising sensor accuracy in high volume applications such as clinical thermometers.


  • Medical thermometers
  • Wearable tracker devices
  • Battery chargers and battery packs
  • Heat detectors and fire detectors
  • Room thermostats
  • Home automation products


  • Highly accurate and very fast response
  • Tight resistance and B-value tolerances
  • Small epoxy bead size <1.6mm
  • Operating range -40°C/+100°C
  • Various insulated lead-wire options

See attached datasheet for RT table information and further product details

Semitec ET NTC Thermistor Product Dimensions

Technical Specifications

Semitec ET Epoxy NTC Thermistor RT Table