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MF72 Power NTC Thermistor Series
Small size, high power, strong ability to suppress surge current
Fast response
Material constant (B value) is large, and the residual resistance
is small
Long life and high reliability
Complete series, wide application range
●Introduction
When you turn on an electrical equipment, the surge current can be restrained by a power NTC termistor connected in series with the power circuit. Because of the continuing action of current,temperature of power NTC thermistor raising, the resistance will rapidly drop to a small value, the consumed power can be ignored. So it can't affect normal operating current. Therefore, using power NTC thermistor is a most effectively and most brief measure to restrain surge current, protecting electrical equipment from destruction.
●Applications
◎Conversion power-supply, switch power-supply, ups power-supply
◎Electronic energy saving lamps, electronic ballast and all kinds of electric heater
◎All kinds of RT, display
◎ Bulb and other lighting lamps
●Characteristics
◎Small size, strong power and strong capability of surge current protection.
◎ Fast response to surge current
◎ Big material constant (B value), Small remain resistance
◎Longevity of service. High reliability
◎ Integral series, extensive operating range
● MAIN TECHNICAL PARAMETER
Part No MF 72
| Max Steady State Current(A) | Approx.R of Max.Cur.(Ω ) | Operating Temp.(℃ ) | Max surge capacity(UF) 240V/AC |
| D5 | 0.1~1 | 0.353~18.70 | -140 ±150 | 47~100 |
| D7 | 0.2~2 | 0.283~11.65 | -140 ±150 | 68~150 |
| D9 | 0.2~4 | 0.120~30.30 | -140 ±170 | 47~220 |
| D11 | 1.2~5 | 0.095~1.656 | -140 ±170 | 150~470 |
| D13 | 1.2~7 | 0.062~2.124 | -140 ±200 | 220~560 |
| D15 | 1.8~8 | 0.075~1.652 | -140 ±200 | 330~680 |
| D20 | 5~11 | 0.018~0.212 | -140 ±200 | 680~1000 |
| D25 | 6~12 | 0.014~0.160 | -140 ±200 | 820~1200 |
●Dimensions(mm)
Part No Dim(mm) Sym | D max | T max | d ±0.05 | F1±1 | Straight lead | Kinked lead | |
| Lmin | L1min | L2±2 | |||||
| MF72 □D5 | 7 | 5 | 0.6/0.45 | 5 | 25 | 17/5 | 5 |
| MF72 □D7 | 9 | 5 | 0.6 | 5 | 25 | 17/5 | 5 |
| MF72 □D9 | 11 | 5.5 | 0.8/0.6 | 7.5 | 25 | 17/5 | 5 |
| MF72 □D1I | 13 | 5.5 | 0.8 | 7.5 | 25 | 17/5 | 5 |
| MF72 □D13 | 15.5 | 6 | 0.8 | 7.5 | 25 | 17/5 | 5 |
| MF72 □D15 | 17.5 | 6 | 0.8 | 7.5 | 25 | 17/5 | 5 |
| MF72 □D20 | 22.5 | 7 | 1.0 | 10 | 25 | / | / |
| MF72 □D25 | 27.5 | 8 | 1.0 | 10 | 25 | / | / |
MF72 power type NTC thermistor series
Power Type NTC Thermistor 5D-15 5 Ohm 15mm 6A 1.5D-15 3D-15 10D-15 47D-15 15D-15 120D-15
Technical parameters of thermistor
1. Nominal resistance Rc: generally refers to the actual resistance
value of the thermistor when the ambient temperature is 25°C.
2. Actual resistance value RT: The resistance value measured under
certain temperature conditions.
3. Material constant: It is a parameter describing the physical
characteristics of the thermistor material, and it is also an index
of thermal sensitivity. The larger the B value, the higher the
sensitivity of the thermistor. It should be noted that in actual
work, the B value is not a constant, but increases slightly with
the increase of temperature.
4. Temperature coefficient of resistance αT: It indicates the rate
of change of resistance value when the temperature changes by 1°C,
and the unit is %/°C.
5. Time constant τ: The thermistor has thermal inertia, and the
time constant is a parameter describing the thermal inertia of the
thermistor. It is defined as the time required for the temperature
of the thermistor body to change by 63.2% of the difference between
the two specific temperatures when the ambient temperature suddenly
changes from one specific temperature to another specific
temperature in the state of no power consumption . The smaller the
τ, the smaller the thermal inertia of the thermistor.
6. Rated power PM: Under the specified technical conditions, the
power dissipation allowed by the thermistor's long-term continuous
load. Do not exceed the rated power in actual use. If the ambient
temperature where the thermistor operates exceeds 25°C, its load
must be reduced accordingly.
7. Rated operating current IM: The nominal current value specified
by the thermistor under working conditions.
8. Measuring power Pc: Under the specified ambient temperature, the
electric power consumed when the thermistor body is heated by the
test current and the resistance value change does not exceed 0.1%.
9. Maximum voltage: For NTC thermistors, it refers to the maximum
DC voltage allowed to be continuously applied without causing
thermal runaway of the thermistor under the specified ambient
temperature; In ambient temperature and still air, the maximum DC
voltage allowed to be continuously applied to the thermistor and
ensure the normal operation of the thermistor in the PTC
characteristic part.
10. Maximum operating temperature Tmax: Under the specified
technical conditions, the maximum temperature allowed by the
thermistor for long-term continuous operation.
11. Switching temperature tb: The temperature at which the
resistance value of the PTC thermistor begins to jump.
12. Dissipation coefficient H: When the temperature increases by
1°C, the power dissipated by the thermistor is in mW/°C.
Because the thermistor is basically customized products, the price
of goods is not the original price, the price is subject to the
formal quotation. | |
Features | RoHS compliant |
Halogen-Free (HF) series are available | |
Body size: Ф5mm | |
Radial lead resin coated | |
Operating temperature range: -30℃~+125℃ | |
Wide resistance range | |
Cost effective | |
Recommended Applications | Home appliances;Automotive electronics; Computers;Switch mode power
supplies;Adapters |
Storage Temperature: -10℃~+40℃ | |
Relative Humidity: ≦75%RH | |
Keep away from corrosive atmosphere and sunlight. | |
Period of Storage | 1 year |
| P/N | R@25℃ | Tolerance(%) | Beta Value | Tolerance(%) |
| MF11-050 | 5 | ±5 ±10 ±20 | 2400 | ±5 ±10 |
| MF11-100 | 10 | 2800 | ||
| MF11-150 | 15 | 2800 | ||
| MF11-200 | 20 | 2800 | ||
| MF11-220 | 22 | 2800 | ||
| MF11-270 | 27 | 3000 | ||
| MF11-330 | 33 | 3000 | ||
| MF11-390 | 39 | 3000 | ||
| MF11-470 | 47 | 3100 | ||
| MF11-500 | 50 | 3100 | ||
| MF11-680 | 68 | 3100 | ||
| MF11-820 | 82 | 3100 | ||
| MF11-101 | 100 | 3200 | ||
| MF11-121 | 120 | 3200 | ||
| MF11-151 | 150 | 3200 | ||
| MF11-201 | 200 | 3200 | ||
| MF11-221 | 220 | 3500 | ||
| MF11-271 | 270 | 3500 | ||
| MF11-331 | 330 | 3500 | ||
| MF11-391 | 390 | 3500 | ||
| MF11-471 | 470 | 3500 | ||
| MF11-501 | 500 | 3500 | ||
| MF11-561 | 560 | 3500 | ||
| MF11-681 | 680 | 3800 | ||
| MF11-821 | 820 | 3800 | ||
| MF11-102 | 1000 | 3800 | ||
| MF11-122 | 1200 | 3800 | ||
| MF11-152 | 1500 | 3800 | ||
| MF11-202 | 2000 | 4000 | ||
| MF11-222 | 2200 | 4000 | ||
| MF11-272 | 2700 | 4000 | ||
| MF11-302 | 3000 | 4000 | ||
| MF11-332 | 3300 | 4000 | ||
| MF11-392 | 3900 | 4000 | ||
| MF11-472 | 4700 | 4050 | ||
| MF11-502 | 5000 | 4050 | ||
| MF11-562 | 5600 | 4050 | ||
| MF11-682 | 6800 | 4050 | ||
| MF11-822 | 8200 | 4050 | ||
| MF11-103 | 10000 | 4050 | ||
| MF11-123 | 12000 | 4050 | ||
| MF11-153 | 15000 | 4150 | ||
| MF11-203 | 20000 | 4300 | ||
| MF11-303 | 30000 | 4300 | ||
| MF11-473 | 47000 | 4300 | ||
| MF11-503 | 50000 | 4300 | ||
| MF11-683 | 68000 | 4300 | ||
| MF11-104 | 100000 | 4500 | ||
| MF11-124 | 120000 | 4700 | ||
| MF11-154 | 150000 | 4700 | ||
| MF11-204 | 200000 | 4700 | ||
| MF11-304 | 300000 | 4700 | ||
| MF11-504 | 500000 | 4800 | ||
| MF11-105 | 1000000 | 4900 |
| Part No.Mf72 | R25 | Max,Steady Stale Current(A) | Approx. R of Maz.Cur. | Dissi.Coef.(MW/℃) | Thermal time Constant(S) | Operating Temp.(℃) |
| 5D5 | 5 | 1 | 0.353 | 6 | 20 | -55~+200 |
| 10D5 | 10 | 0.7 | 0.771 | 6 | 20 | |
| 60D5 | 60 | 0.3 | 1.878 | 6 | 18 | |
| 200D5 | 200 | 0.1 | 18.70 | 6 | 18 | |
| 5D7 | 5 | 2 | 0.283 | 10 | 30 | |
| 8D7 | 8 | 1 | 0.539 | 9 | 28 | |
| 10D7 | 10 | 1 | 0.616 | 9 | 27 | |
| 12D7 | 12 | 1 | 0.816 | 9 | 27 | |
| 16D7 | 16 | 0.7 | 1.003 | 9 | 27 | |
| 22D7 | 22 | 0.6 | 1.108 | 9 | 27 | |
| 33D7 | 33 | 0.5 | 1.485 | 10 | 28 | |
| 200D7 | 200 | 0.2 | 11.65 | 11 | 28 | |
| 3D9 | 3 | 4 | 0.120 | 11 | 35 | |
| 4D9 | 4 | 3 | 0.190 | 11 | 35 | |
| 5D9 | 5 | 3 | 0.210 | 11 | 34 | |
| 6D9 | 6 | 2 | 0.315 | 11 | 34 | |
| 8D9 | 8 | 2 | 0.400 | 11 | 32 | |
| 10D9 | 10 | 2 | 0.458 | 11 | 32 | |
| 12D9 | 12 | 1 | 0.652 | 11 | 32 | |
| 16D9 | 16 | 1 | 0.802 | 11 | 31 | |
| 20D9 | 20 | 1 | 0.864 | 11 | 30 | |
| 22D9 | 22 | 1 | 0.950 | 11 | 30 | |
| 30D9 | 30 | 1 | 1.022 | 11 | 30 | |
| 33D9 | 33 | 1 | 1.124 | 11 | 30 | |
| 50D9 | 50 | 1 | 1.252 | 11 | 30 | |
| 60D9 | 60 | 0.8 | 1.502 | 11 | 30 | |
| 80D9 | 80 | 0.8 | 2.010 | 11 | 30 | |
| 120D9 | 120 | 0.8 | 3.015 | 11 | 30 | |
| 200D9 | 200 | 0.5 | 5.007 | 11 | 32 | |
| 400D9 | 400 | 0.2 | 30.30 | 11 | 32 | |
| 2.5D11 | 2.5 | 5 | 0.095 | 13 | 43 | |
| 3D11 | 3 | 5 | 0.100 | 13 | 43 | |
| 4D11 | 4 | 4 | 0.150 | 13 | 44 | |
| 5D11 | 5 | 4 | 0.156 | 13 | 45 | |
| 6D11 | 6 | 3 | 0.240 | 13 | 45 | |
| 8D11 | 8 | 3 | 0.255 | 14 | 47 | |
| 10D11 | 10 | 3 | 0.275 | 14 | 47 | |
| 12D11 | 12 | 2 | 0.462 | 14 | 48 | |
| 16D11 | 16 | 2 | 0.470 | 14 | 50 | |
| 20D11 | 20 | 2 | 0.512 | 15 | 52 | |
| 22D11 | 22 | 2 | 0.563 | 15 | 52 | |
| 30D11 | 30 | 1.5 | 0.667 | 15 | 52 | |
| 33D11 | 33 | 1.5 | 0.734 | 15 | 52 | |
| 50D11 | 50 | 1.5 | 1.021 | 15 | 52 | |
| 60D11 | 60 | 1.5 | 1.215 | 15 | 52 | |
| 80D11 | 80 | 1.2 | 1.656 | 15 | 52 | |
| 1.3D13 | 1.3 | 7 | 0.062 | 13 | 52 | |
| 1.5D13 | 1.5 | 7 | 0.073 | 13 | 60 | |
| 2.5D13 | 2.5 | 6 | 0.088 | 13 | 160 | |
| 3D13 | 3 | 6 | 0.092 | 14 | 60 | |
| 4D13 | 4 | 5 | 0.120 | 15 | 67 | |
| 5D13 | 5 | 5 | 0.125 | 15 | 68 | |
| 6D13 | 6 | 4 | 0.170 | 15 | 65 | |
| 7D13 | 7 | 4 | 0.188 | 15 | 65 | |
| 8D13 | 8 | 4 | 0.194 | 15 | 60 | |
| 10D13 | 10 | 4 | 0.206 | 15 | 65 | |
| 12D13 | 12 | 3 | 0.316 | 16 | 65 | |
| 15D13 | 15 | 3 | 0.335 | 16 | 60 | |
| 16D13 | 16 | 3 | 0.338 | 16 | 60 | |
| 20D13 | 20 | 3 | 0.372 | 16 | 65 | |
| 30D13 | 30 | 2.5 | 0.517 | 16 | 65 | |
| 47D13 | 47 | 2 | 0.810 | 17 | 65 | |
| 120D13 | 120 | 1.2 | 2.124 | 16 | 65 | |
| 1.3D15 | 1.3 | 8 | 0.048 | 18 | 65 | |
| 1.5D15 | 1.5 | 8 | 0.052 | 18 | 68 | |
| 3D15 | 3 | 7 | 0.075 | 18 | 69 | |
| 5D15 | 5 | 6 | 0.112 | 18 | 76 | |
| 6D15 | 6 | 5 | 0.155 | 20 | 76 | |
| 7D15 | 7 | 5 | 0.173 | 20 | 80 | |
| 8D15 | 8 | 5 | 0.178 | 20 | 80 | |
| 10D15 | 10 | 5 | 0.180 | 20 | 80 | |
| 12D15 | 12 | 4 | 0.250 | 20 | 80 | |
| 15D15 | 15 | 4 | 0.268 | 21 | 75 | |
| 16D15 | 16 | 4 | 0.276 | 21 | 75 | |
| 20D15 | 20 | 4 | 0.288 | 21 | 85 | |
| 30D15 | 30 | 3.5 | 0.438 | 21 | 70 | |
| 47D15 | 47 | 3 | 0.680 | 21 | 86 | |
| 120D15 | 120 | 1.8 | 1.652 | 22 | 87 | |
| 0.7D20 | 0.7 | 11 | 0.018 | 24 | 89 | |
| 1.3D20 | 1.3 | 9 | 0.037 | 24 | 88 | |
| 3D20 | 3 | 8 | 0.055 | 24 | 88 | |
| 5D20 | 5 | 7 | 0.087 | 24 | 87 | |
| 6D20 | 6 | 6 | 0.113 | 25 | 103 | |
| 8D20 | 8 | 6 | 0.142 | 25 | 105 | |
| 10D20 | 10 | 6 | 0.162 | 25 | 102 | |
| 12D20 | 12 | 5 | 0.195 | 25 | 100 | |
| 16D20 | 16 | 5 | 0.212 | 25 | 100 | |
| 0.7D25 | 0.7 | 12 | 0.014 | 30 | 120 | |
| 1.5D25 | 1.5 | 10 | 0.027 | 30 | 121 | |
| 3D25 | 3 | 9 | 0.044 | 32 | 124 | |
| 5D25 | 5 | 8 | 0.070 | 32 | 125 | |
| 8D25 | 8 | 7 | 0.114 | 33 | 125 | |
| 10D25 | 10 | 7 | 0.130 | 32 | 125 | |
| 12D25 | 12 | 6 | 0.156 | 32 | 126 | |
| 16D25 | 16 | 6 | 0.160 | 35 | 126 |
Negative temperature coefficient thermistor, also known as NTC
thermistor, is a kind of sensor resistance whose resistance value
decreases with the increase of temperature. Widely used in various
electronic components, such as temperature sensors, resettable
fuses and self-adjusting heaters, etc.
