NTC thermistor power limit current limit resistor surge arrestor 200D7 200ohm 7mm diameter mf72 thermistor electronics parts

 Electronic components- NTC thermistor MF72-200D7

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.

PRODUCT:

 1.Dimension:

2. Material: 

Coating: Phenolic resin 

Lead wire: CP lead wire

Coating color: Black

3. Technical data:

A. Zero power resistance at 25 ℃ :200+/-20% 

B.Thermal time constant: 28s 

D. Thermal Dissipation Constant: 11 mW/℃ 

E.Operating Temperature:-40+150 

F.Max. Steady State Current: 0.2A 

Recongnized Certificate:

FUNCTION:

WORKSHOP

NTC Thermistor General Performance

a. Resistance value at Rated Zero-power R25: The design resistance of the thermistor usually refers to the resistance value got at Zero-power at 25  ℃, which is usually indicated on the thermistor.

b.The zero-power resistance: The zero-power resistance of a thermistor RT at a specified temperature(T) is the DC resistance measured when the power dissipation is negligible.

c. B: is the beta, or material constant expressed in kelvins.

d. Temperature coefficient of resistance: The temperature coefficient of resistance or alpha of an NTC thermistor is defined as:

e. Dissipation factor: The dissipation factor is defined as the ratio of the change in power dissipation and the resultant change in the thermistor's body temperature.

f.Thermal time constant : The thermal time constant refers to the necessary for an unloaded thermistor to vary its temperature by 63.2% of the difference between its mean temperature and the ambient temperature.

g.Temperature characteristic: The relation between the zero-power resistance and the temperature of the NTC thermistor body.

h.Solderability: Both lead wires are immersed into 235+/-5 solder for 2+/-0.5s, check the appearance.

i. Terminal Durability of soldering: The lead wire is soaked in molten solder at 260+/-10 from the bottom to a point of 2-2.5mm for 5+/-0.5minutes.After the device is left at room temperature for 2 hours, the resistance is measured.

 Our company is a professional electronic parts trading company with years’ experience. So we want to avail ourselves of opportunity establishing business relation with you.

we are proud to offer you the most comprehensive range of products including the latest releases, such as varistor/MOVs, film capacitor, NTC thermistor, PPTC fuse and travel adapter from the world’s best manufacturer of electronic devices. By the way, free sample are available.If you have any inquiry, pls feel free to contact us at