1 Ohm 20A High Inrush Current Power NTC Thermistor For Switching Power Supply
Product Details:
Place of Origin: | DONGGUAN,GUANGDONG,CHINA |
Brand Name: | AMPFORT |
Certification: | UL |
Model Number: | MF71-1D-25MY |
Payment & Shipping Terms:
Minimum Order Quantity: | 1000PCS |
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Price: | 0.5~1USD/PC |
Packaging Details: | Bulk, |
Delivery Time: | 10 workdays |
Payment Terms: | T/T, Western Union, MoneyGram |
Supply Ability: | 500000pcs per day |
Detail Information |
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Name: | NTC Thermistor 1D-25 | Resistance @25C: | 1 Ohm |
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Resistance Tolerance: | +/-20% | Norminal Dia: | 25mm |
B Contact: | 2950 10% | Max Static Current: | 20A |
Experimental Capacitance 240V: | 1200uF | Rated Power: | 7W |
Dissipation Factor: | 30mw/C | Thermal Time Constant: | 130s |
Highlight: | High Inrush Current Power NTC Thermistor,20A Power NTC Thermistor,Switching Power Supply 1 Ohm Thermistor |
Product Description
High Inrush Current Power NTC Thermistor MF71 1D-25 1Ohm 25mm 20A For Switching Power Supply
Description Of The Power NTC Thermistor MF71 1D-25 1Ohm 25mm 20A
* NTC Thermistor is a kind of resistor with negative temperature coefficient.It's resistance decreases with the temperature rising. According to its different uses, the thermistor may be packaged in various forms with different performances.
* MF71 Series Thermistor was applied to restrain surge current and protect overvoltage in various power supplies,IC,circuit.
* MF11 Series thermistor are widely applied to compensate temperature variation and measure temperature
Size Of The Power NTC Thermistor MF71 1D-25 1Ohm 25mm 20A (mm)
MODEL | Dmax | P±1 | d±0.05 | Amin | Tmax |
MF71-1D-25MY | 30 | 7.5/10 | 1.0 | 7 | 8 |
Electrical Characteristic Of The Power NTC Thermistor MF71 1D-25 1Ohm 25mm 20A
Type |
1D-25 |
Zero Power Resistance at 25℃ | |
1±20% ohm | |
maximum steady state current at 25℃ | |
20A | |
Capacitance at 240Vac | |
1200μF (240V) | |
Thermal Dissipation Constant (δ) | |
≧30 mw/℃ | |
Thermal Time constantτ(t) | |
≦130S | |
Operation Temperature | |
-40~+200℃ | |
Rating power (Pmax) | |
7.0W |
Performance Characteristics Of The Power NTC Thermistor MF71 1D-25 1Ohm 25mm 20A
Item |
Test Methods |
Specifications |
Zero Power Resistance at 25℃ |
Resistance shall be measured at DC current applied when the self heat generation does not occur at room ambient (25.0±0.2℃) |
1±20% ohm |
Thermal Dissipation Constant |
Equivalent to the required power to rise temperature of the thermistor up to 1℃ in the air and without cooling of airflow. the unit of the constant is mw/℃ |
≥30mw/℃ |
Maximum allowable steady-state current (Imax) |
Maximum allowable steady-state DC current applied at the specified temperature without cooling of airflow |
20A |
Thermal Time constant |
The period of time when the temperature of the specimens is (1-1/e) times the temperature difference shall be measured when the ambient temperature is changed.(e:2.71828) |
≤130S |
Voltage withstanding (Between Terminals and coating) |
An AC Voltage of 1000V shall be applied. Between the terminals and the insulating coating for one minute at room ambient. |
No substantial damage ΔR/R≤±20% |
Insulation Resistance (Between Terminals and coating) |
Insulation resistance between terminals and the insulating coating shall be measured at 1000Vdc with one minute electrification, and at room ambient. |
≥500MΩ |
Packing Specification Of The Power NTC Thermistor MF71 1D-25 1Ohm 25mm 20A
(PCS) Quantity of each inter-box |
(PCS) Quantity of each outer-box |
200 | Appr.2000 |
Lead-free wave soldering process temp. Of The Power NTC Thermistor MF71 1D-25 1Ohm 25mm 20A
1. Preheat temp.:100-120 ℃, Time:86-100/Sec, Heating rate:1-2 ℃/Sec
2. Parts after preheating, into the 255-260 ℃ molten tin, immersion time:2.5-3.5/Sec
3. Parts after welding cooling rate of 1-3 ℃/Sec
4. Total welding time was 3.5Min.
In order to ensure the parts had to withstand thermal shock wave soldering, specification of heat-resistant parts must be higher than the temperature curve of wave soldering temperature, the largest is above 260 ℃
Storage Conditions Of The Power NTC Thermistor MF71 1D-25 1Ohm 25mm 20A
1. Storage Temperature : -10℃~+40℃
2. Relative Humidity : ≦75%RH
3. Keep products away from corrosive such as sulfur, chlorine gas or acid, or it may cause oxidization of electrode, resulting in poor solderability
4. The products can be used in two years under storage condition.