Terminology » NTC vs. PTC Thermistors: Key Differences Explained

NTC vs. PTC Thermistors: Key Differences Explained

thermistor ntc ptc temperature coefficient thermal resistor

This page clarifies the difference between NTC and PTC thermistors.

Introduction to Thermistors

  • A thermistor is a semiconductor device whose resistance changes with temperature.
  • It’s also known as a thermal resistor.
  • Thermistors come in various shapes and sizes, like rods, discs, and beads.

NTC Thermistor

  • NTC stands for Negative Temperature Coefficient.
  • In an NTC thermistor, resistance decreases as temperature increases, as illustrated below.
  • NTC thermistors are made from oxides of nickel, cobalt, copper, manganese, and other materials.
  • They’re commonly used for temperature control and measurement.
  • NTC thermistors are typically used in the temperature range of -55°C to 200°C.
  • Example: SMD KT series NTC thermistor chips manufactured by ATC Semitec Limited.

NTC thermistor vs PTC thermistor,difference between NTC thermistor and PTC thermistor

PTC Thermistor

  • PTC stands for Positive Temperature Coefficient.
  • In a PTC thermistor, resistance increases as temperature increases, as illustrated below.
  • PTC thermistors are made using barium titanate.
  • They are often used to protect electronic circuits from overheating.
  • PTC thermistors are generally used in the temperature range of 0°C to 200°C.
  • Example: SMD PTC thermistors (TPM series) manufactured by ATC Semitec Limited, which are used as thermal switches.
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