NTC thermistor power current limit resistor surge arrestor 22D7 22ohm 7mm diameter ntc sensors

Electronic components- NTC thermistor MF72-22D7

Thermistor-A thermistor is a type of resistor whose resistance varies significantly with temperature, more so than in standard resistors. The word is a portmanteau of thermal and resistor. Thermistors are widely used as inrush current limiter, temperature sensors (NTC type typically), self-resetting overcurrent protectors, and self-regulating heating elements.
Thermistor differ from resistance temperature detectors (RTDs) in that the material used in a thermistor is generally a ceramic or polymer, while RTDs use pure metals. The temperature response is also different; RTDs are useful over larger temperature ranges.
Thermistor can be classified into two types, depending on the classification of k. If k is positive, the resistance increases with increasing temperature, and the device is called a positive temperature coefficient (PTC) thermistor, or posistor. If k is negative, the resistance decreases with increasing temperature, and the device is called a negative temperature coefficient (NTC) thermistor.
Resistors that are not thermistors are designed to have a k as close to 0 as possible, so that their resistance remains nearly constant over a wide temperature range.

Electronic components- NTC thermistor MF72-22D7

 Material: 

Coating: Phenolic resin
Lead wire: CP lead wire
Coating color: Black

3. Technical data:
A. Zero power resistance at 25 ℃ : 22+/-20%
B.Thermal time constant: 27s
D. Thermal Dissipation Constant: 9 mW/℃
E.Operating Temperature:-40+150
F.Max. Steady State Current: 0.6A