Technical requirements for MF52 series NTC thermistor

　　MF52 series NTC thermistor is a small NTC resistor chip coated with epoxy resin. It is made of new materials and has novel technology. It has the advantages of high precision, fast response and small volume. It is often manufactured into temperature sensors of various shapes by secondary processing, or connected in series with the circuit as a surge current limiter. They are usually used for temperature control and indication, as well as current suppression.

　　2. The MF52 series NTC thermistor is in the shape of water drop, and the interface between the sealing port and the wire is neat and smooth, without glue separation and cracking. The packaging part is smooth and round without bubbles and mottling; The external mold and wire of the connector are non-toxic and cold-resistant PVC, and the color is black. The color of the sensor packaging resin is Pantone according to different requirements.

　　3. The package is firmly bonded to the wire and can withstand the tension of more than 3.5KG.

　　4. The measured values of the product at different temperature points meet the tolerance requirements of the B value table of NTC resistance.

　　5. 100% continuity test, no short circuit, open circuit and poor contact.

　　6. NTC chip welding change rate (250 ℃/1S с.)≤ 0.3%.

　　7. Thermal cycle impact test: place the epoxy sealed thermistor in the oil bath at - 30 ℃ for 5min ← → 90 ℃ for 5min, and the change rate of electrical performance (R25) after 1000 cycles is less than ± 1%.

　　8. When NTC resistance value is 25 ℃, the nominal resistance value is 2.252K Ω; At 37 ℃, the nominal resistance is 1.3554 K Ω, and the measured resistance at 30 ± 0.2 ℃, 35 ± 0.2 ℃ and 40 ± 0.2 ℃ should be within the resistance range of Beta value 3976 (25/85).

　　9. The accuracy of NTC thermistor shall meet the characteristic standard, and all materials of temperature probe shall meet the ROHS standard.

　　10K Ω NTC thermistor B value=3977K

　　The resistance of NTC thermistor is inversely related to temperature. The temperature, NTC resistance, resistance tolerance and B value are the main concerns in the temperature and temperature comparison table. In the case of notification, the resistance is the nominal resistance of NTC thermistor. In most cases, it refers to the resistance at 25 ℃. It provides a convenient reference point.

　　The value of B is the material constant, which is determined by the ceramic material from which it is made, and describes the gradient of the resistance (R/T) curve within a specific temperature range between two temperature points. Each thermistor material will have different material constants, so it has different resistance and temperature curves.

　　Let's take a look at some technical parameters of 10K Ω NTC thermistor B value=3977K at 25 ℃

　　10k Ω NTC thermistor B value=3977K Features:

　　1。 Operating temperature range: - 30 ℃ - 105 ℃

　　2。 High accuracy tolerance is+/- 0.1 ℃

　　3。 Excellent thermal cycle endurance

　　4。 Fast response, stable model

　　5。 Good consistency and interchangeability, high-precision resistance and B value

　　6。 Waterproof resin packaging technology, good insulation packaging quality, strong bending resistance. High stability

　　7。 Lead-free, halogen-free, RoHS compliant

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