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NTC thermistor power limit current limit resistor surge arrestor 12D7 10ohm 7mm diameter mf72
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Product Details
Place of Origin: | Guangdong, China | Brand Name: | HEL | Model Number: | 12D7 |
Type: | Thermal Resistor | Technology: | Ceramic Composition | Package Type: | Throught Hole |
Resistance: | 12ohm | Resistance Tolerance: | +/-20% | ||
Operating Temperature: | 25 |
Product Description
Electronic components- NTC thermistor MF72-12D7
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 ℃ : 12+/-20%
B.Thermal time constant: 27s
D. Thermal Dissipation Constant: 9 mW/℃
E.Operating Temperature:-40+150
F.Max. Steady State Current: 1A
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.
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