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JNR20S050M11P05 Silicone Coated NTC Thermistor 5D-20 5R 7A With Tinned Copper Wire
Description Of The Silicone Coated NTC Thermistor
Silicone coated ntc thermistor with tinned copper wire is best thermistor structure with best perforamances with higher steady state current, copper wire is more steady than Tinned copper clad steel wire,silicone is better than phenolic on temperature/heat conduct. If cost limited, customer can choose another version - phenolic coating and tinned copper clad steel wire, which is most popular .
Function Of The Silicone Coated NTC Thermistor
In electronic circuit which contains capacitors, filament bulbs, fluorescent lamp inverters and heaters, etc., will generate a inrush current with several ten times beyond the steady state current when it switch on. The zero-power resistance value of NTC is useful to suppress the inrush current and keep the circuit work stable.
Features Of The Silicone Coated NTC Thermistor
- RoHS / Halogen-Free (HF) compliant
- Body size : Ø5mm ~ Ø80mm
- Highly stable electrical characteristics
- Coating material flame retardant to UL 94V-0
- Wide resistance range Agency recognition : UL / CUL / TUV / CQC
ELECTRICAL CHARACTERISTICS Of The Silicone Coated NTC Thermistor
| Rated Zero-Power Resistance | 5 Ohm±20% |
| Thermal Dissipation Constant | ≥20mW/°C |
| Material Constant | 3000K±10% |
| Max.Steady State Current | 7.0A |
| Thermal Time Constant | ≤120s |
Applications Of The Silicone Coated NTC Thermistor
* Home appliances
* Office automation
* Switch mode power supplies
* Adapters
* Lighting driver
R/T curve Of The Silicone Coated NTC Thermistor
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NTC Parameter Definition Of The Silicone Coated NTC Thermistor
| Operating temperature range | Ambient temperature range for thermistor’s continuous operate at zero rated power. The defined maximum and minimum operating temperatures are specified in each series. |
| Thermal time constant (τ) | The thermal time constant is the time required for a thermistor to reach 63.2% of the difference between its initial and final body temperature when subjected to a step function change in ambient temperature under zero-power condition and is normally expressed in second. (See Fig.D) Remark: the smaller the product volume is, the smaller the heat capacity and the faster the response. |
| Thermal dissipation coefficient (δ) | The thermal dissipation coefficient is ratio, it is expressed in mW/°C, at a specified ambient temperature, of a change in power dissipation in a thermistor to the resultant body temperature change. (It can be expressed by the formula: δ=V*I/ΔT) |
| Maximum Rated Power Consumption (Pmax.) | The maximum rated power consumption is the maximum power rating applied to the thermistor continuously at 25℃ ambient temperature or the specified temperature in the specification. When the working temperature is below 0℃ or over 25℃, the rating power should be decreased. (see Fig. C) |
| Maximum Load Capacitance @AC240V | The maximum capacitance is the maximum allowable capacitance of MF72 series in power supply applications. This capacitance refers to the filter capacitance at the back end of the bridge rectifier. Generally, the recommended value of the MF72 series should be greater than the value of the filter capacitance in the circuit |
| Resistance at maximum current (RImax.) | The resistance at maximum current is the approximate resistance of an inrush current limiting thermistor, expressed in ohms(Ω), when it is conducting its rated maximum steady-state current. |
| Maximum steady-state current (Imax.) | The maximum steady-state current is the rating of the maximum current, normally expressed in amperes(A), allowable to be conducted by an inrush limiting NTC Thermistor for an extended period of time. |