Thermistors are available in a range of types, materials and sizes according to the response time and operating temperature. Also, hermetically sealed thermistors eliminate errors in resistance readings due to moisture penetration while offering high operating temperatures and a compact size.
The three most common types are: Bead thermistors, Disk and Chip thermistors, and Glass encapsulated thermistors. NTC disc and chip thermistors are a cost effective and simple option for solving temperature measurement or temperature compensation challenges. NKT NTC thermistors, surface made by phenolic-resin (black) or silicone (green) materials, belong to disk and chip thermistors.
The NKT NTC thermistors have metallized surface contacts. Because of larger size, they have a higher dissipation constant (power required to raise their temperature by 1°C) and since power dissipated by the thermistor is proportional to the square of the current, they can handle higher currents much better than other type thermistors.
Disk type thermistors are made by pressing a blend of oxide powders into a round die, which are then sintered at high temperatures. Chips are usually fabricated by a tape-casting process where slurry of material is spread out as a thick film, dried and cut into shape.