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  • Functional characteristics
  • NTC Thermistor for surge suppression-MF72 series
    Model Number:
    MF72 D5 series
    MF72 D8 series
    MF72 D10 series
    MF72 D13 series
    MF72 D15 series
    MF72 D20 series
    Etc.
    Product Coating color: black or green

    Brief Introduction of NTC Thermistor for surge suppression:
    MF72 series Power Type NTC thermistor for surge suppression are made of a specially formulated metal oxide ceramic material and in the form of radial resin coated that is capable of limiting high surge current. Applying power NTC thermistor in the power supply loop is the most simple, convenient and effective measure to restrain switch-on surge current and protect electronic equipment.

    Product Application of NTC Thermistor for surge suppression:
    1. Conversion power supply, switch power supply, UPS power
    2. Power supply circuit, electronic circuit of electric equipments
    3. Electric heater
    4. Electronic ballast
    5. Oscillight,display
    6. Filament protection of bulb,electronic energy-saving lamps and other lighting lamps

    Application Example of NTC Thermistor for surge suppression:
    NTC thermistor MF72 application

    Working principle of NTC Thermistor for surge suppression:
    When turn on an electrical equipment,a prodigious surge current arises in the moment can be restrained effectively by a power NTC thermistor connected in series with the power circuits,which including a capacity, heater, motor.This inrush current lasts short, but its peak current is prodigious. It can even exceed 100 times of operating current in conversion power, switch power and UPS power.So limiting the surge current measures must be took effectively.When current is applied on NTC thermistor directly, NTC thermistor resistance may decrease with the heating of NTC thermistor speedily. Power type NTC thermistor has a specified zero power resistance, when it is in series in the circuit, it can restrain the switch-on surge current effectively. After it completes surge current limiting function, due to the current operation continuously, the resistance can decrease to very small value,its power consumption can be neglected, does not influence the normal operation current. Therefore, applying power NTC thermistor in the power supply loop is a most effectively and most brief measure to restrain surge current,protecting electrical equipment from destruction.Be noticed, the NTC thermistor can not be used in parallel in the circuit since one unit will tend to conduct all the current available nearly.Therefore,thermistor may be used in the AC(position A1 or A2) or the DC(position D1 or D2) locations in the circuit(see Fig A).
    NTC thermistor MF72 circuit

    Main parameter of NTC Thermistor for surge suppression:
    Zero Power Resistance Value R25(Ω)
    Maximum stable current I(A)
    Approximate resistance in maximum current(Ω)
    Thermal time constant(S)
    Dissipation factor (mW/ ℃)
    Operating temperature range -55~+200 ℃

    Selection Guide of NTC Thermistor for surge suppression:
    1. Maximum operating current > Actual operating current in the power loop
    2. Rated zero power resistance at 25C
    of which, E: loop voltage, Im: Surge current
    For conversion power, reversion power, switch power, UPS power, Im=100 times operating current
    For filament, heater, Im =30 times operating current

    Advantages of NTC Thermistor for surge suppression:
    1.long service life,high reliability,wide operation range
    2.small dimension,large power,strong in surge protection
    3.fast response to surge current
    4.large material constant,low resistance residue
    5.can limit inrush current effectively
    6.minimum power loss in stationary state(Normally just 1W or less than 50W power)
    7.high thermal and electrical reliability
    8.wide selection of electrical characteristics
    9.Wide operating temperature -55~+200 ℃
    10,RoHS compliant
    Comparison without and with NTC thermistor application
    NTC thermistor MF72 inrush limit comparision

    Dimension(Unit: mm):
    MF72 NTC thermistor dimension

    Marking of Part Number:
    MF72 NTC thermistor inrush current limit part number

    Marking of Part Number
    1.Series:MF72- NTC Thermistor for surge suppression
    2.R25 resistance:10-10Ω
    3.Dimension:D-Diameter
    4.Chip diameter:11-Φ11mm

    Specifications and Part No.:

    Item Part No. Resistance  
    R 25(Ω)
    Max Steady State Current (A) Approx. Resistance Value at Maximum Current (Ω) Dissipation Factor
    (mW/oC)  
    Thermal Time Constant (sec)  Dimensions (mm)
    Dmax Tmax F±1
    1 MF72-0.7D20 0.7 11 0.018 24 89 22.5 7 10/7.5
    2 MF72-0.7D25 0.7 12 0.014 30 120 29 8 10
    3 MF72-1.3D13 1.3 7 0.062 13 60 15.5 6 7.5
    4 MF72-1.3D15 1.3 8 0.048 18 68 17.5 6 10/7.5
    5 MF72-1.3D20 1.3 9 0.037 24 88 22.5 7 10/7.5
    6 MF72-1.5D13 1.5 7 0.073 13 60 15.5 6 7.5
    7 MF72-1.5D15 1.5 8 0.052 18 69 17.5 6 10/7.5
    8 MF72-1.5D25 1.5 10 0.027 30 121 29 8 10
    9  MF72 2.5D11 2.5 5 0.095 13 43 13 5.5 7.5 /5
    10 MF72 2.5D13 2.5 6 0.088 13 60 15.5 6 7.5
    11 MF72-3D9 3 4 0.12 11 34 11 5.5 7.5 /5
    12   MF72 3D11 3 5 0.1 13 43 13 5.5 7.5 /5
    13 MF72 3D13 3 6 0.092 14 60 15.5 6 7.5
    14 MF72 3D15 3 7 0.075 18 76 17.5 6 10/7.5
    15 MF72 3D20 3 8 0.055 24 88 22.5 7 10/7.5
    16 MF72-3D25 3 9 0.044 32 124 29 8 10
    17 MF72-4D9 4 3 0.190 11 35 11 5.5 7.5 /5
    18 MF72-4D11 4 4 0.150 13 44 13 5.5 7.5 /5
    19 MF72-4D13 4 5 0.120 15 67 15.5 6 7.5
    20 MF72-5D5 5 1 0.353 6 20 7.0 5 5 /2.5
    21 MF72-5D7 5 2 0.283 10 30 9.0 5 5
    22 MF72 5D9 5 3 0.21 11 34 11 5.5 7.5 /5
    23 MF72 5D11 5 4 0.156 13 45 13 5.5 7.5 /5
    24 MF72 5D13 5 5 0.125 15 68 15.5 6 7.5
    25 MF72 5D15 5 6 0.112 20 76 17.5 6 10/7.5
    26 MF72 5D20 5 7 0.087 23 87 22.5 7 10/7.5
    27 MF72-5D25 5 8 0.070 32 125 29 8 10
    28 MF72-6D9 6 2 0.315 11 34 11 5.5 7.5 /5
    29 MF72-6D11 6 3 0.240 13 45 13 5.5 7.5 /5
    30 MF72-6D13 6 4 0.170 15 65 15.5 6 7.5
    31 MF72-6D15 6 5 0.155 20 80 17.5 6 10/7.5
    32 MF72-6D20 6 6 0.113 25 103 22.5 7 10/7.5
    33 MF72-7D13 7 4 0.188 15 65 15.5 6 7.5
    34 MF72-7D15 7 5 0.173 20 80 17.5 6 10/7.5
    35 MF72-8D7 8 1 0.539 9 28 9.0 5 5
    36 MF72 8D9 8 2 0.400 11 32 11 5.5 7.5 /5
    37 MF72-8D11 8 3 0.255 14 47 13 5.5 7.5 /5
    38 MF72-8D13 8 4 0.194 15 60 15.5 6 7.5
    39 MF72-8D15 8 5 0.178 20 80 17.5 6 10/7.5
    40 MF72-8D20 8 6 0.142 25 105 22.5 7 10/7.5
    41 MF72-8D25 8 7 0.114 33 125 29 8 10
    42 MF72-10D5 10 0.7 0.771 6 20 7.0 5 5 /2.5
    43 MF72-10D7 10 1 0.616 9 27 9.0 5 5
    44 MF72 10D9 10 2 0.458 11 32 11 5.5 7.5 /5
    45 MF72 10D11 10 3 0.275 14 47 13 5.5 7.5 /5
    46 MF72-10D13 10 4 0.206 15 65 15.5 6 7.5
    47 MF72 10D15 10 5 0.18 21 85 17.5 6 10/7.5
    48 MF72 10D20 10 6 0.162 24 102 22.5 7 10/7.5
    49 MF72 10D25 10 7 0.130 32 125 29 8 10
    50 MF72-12D7 12 1 0.816 9 27 9.0 5 5
    51 MF72-12D9 12 1 0.652 11 32 11 5.5 7.5 /5
    52 MF72-12D11 12 2 0.462 14 48 13 5.5 7.5 /5
    53 MF72-12D13 12 3 0.316 16 65 15.5 6 7.5
    54 MF72-12D15 12 4 0.250 20 75 17.5 6 10/7.5
    55 MF72-12D20 12 5 0.195 25 100 22.5 7 10/7.5
    56 MF72-12D25 12 6 0.156 32 126 29 8 10
    57 MF72-15D13 15 3 0.335 16 60 15.5 6 7.5
    58 MF72-15D15 15 4 0.268 20 75 17.5 6 10/7.5
    59 MF72-16D7 16 0.7 1.003 9 27 9.0 5 5
    60 MF72-16D9 16 1 0.802 11 31 11 5.5 7.5 /5
    61 MF72-16D11 16 2 0.47 14 50 13 5.5 7.5 /5
    62 MF72-16D13 16 3 0.338 16 60 15.5 6 7.5
    63 MF72-16D15 16 4 0.276 21 70 17.5 6 10/7.5
    64 MF72-16D20 16 5 0.212 25 100 22.5 7 10/7.5
    65 MF72-16D25 16 6 0.160 35 126 29 8 10
    66 MF72-20D9 20 1 0.864 11 30 11 5.5 7.5 /5
    67 MF72-20D11 20 2 0.512 15 52 13 5.5 7.5 /5
    68 MF72-20D13 20 3 0.372 16 65 15.5 6 7.5
    69 MF72-20D15 20 4 0.288 21 86 17.5 6 10/7.5
    70 MF72-20D20 20 6 0.201 30 98 22.5 7 10
    71 MF72-20D22 20 7 0.188 30 98 24 7 10
    72 MF72-22D7 22 0.6 1.108 9 27 9.0 5 5
    73 MF72 22D9 22 1 0.95 11 30 11 5.5 7.5 /5
    74 MF72-22D11 22 2 0.563 15 52 13 5.5 7.5 /5
    75 MF72-30D9 30 1 1.022 11 30 11 5.5 7.5 /5
    76 MF72-30D11 30 1.5 0.667 15 52 13 5.5 7.5 /5
    77 MF72-30D13 30 2.5 0.517 16 65 15.5 6 7.5
    78 MF72-30D15 30 3.5 0.438 18 75 17.5 6 10/7.5
    79 MF72-33D7 33 0.5 1.485 10 28 9.0 5 5
    80 MF72-33D9 33 1 1.124 11 30 11 5.5 7.5 /5
    81 MF72-33D11 33 1.5 0.734 15 52 13 5.5 7.5 /5
    82 MF72-47D13 47 2 0.81 17 65 15.5 6 7.5
    83 MF72-47D15 47 3 0.68 21 86 17.5 6 10/7.5
    84 MF72-50D9 50 1 1.252 11 30 11 5.5 7.5 /5
    85 MF72-50D11 50 1.5 1.021 15 52 13 5.5 7.5 /5
    86 MF72-60D5 60 0.3 1.878 6 20 7.0 5 5 /2.5
    87 MF72-60D9 60 0.8 1.502 11 30 11 5.5 7.5 /5
    88 MF72-60D11 60 1.5 1.215 15 52 13 5.5 7.5 /5
    89 MF72-80D9 80 0.8 2.01 11 30 11 5.5 7.5 /5
    90 MF72-80D11 80 1.2 1.658 15 52 13 5.5 7.5 /5
    91 MF72-120D9 120 0.8 3.015 11 30 11 5.5 7.5 /5
    92 MF72-120D13 120 1.2 2.124 16 65 15.5 6 7.5
    93 MF72-120D15 120 1.8 1.652 22 87 17.5 6 10/7.5
    94 MF72-200D5 200 0.1 18.70 6 18 7.0 5 5 /2.5
    95 MF72-200D7 200 0.2 11.65 11 28 9.0 5 5
    96 MF72-200D9 200 0.5 5.007 11 32 11 5.5 7.5 /5
    97 MF72-400D9 400 0.2 30.30 11 32 11 5.5 7.5 /5

    Power NTC thermistor for limmiting surge current with increasing max. operating current:

    Item Part No. Resistance  
    R 25(Ω)
    Max Steady State Current (A) Approx. Resistance Value at Maximum Current (Ω) Max Rated Power Pmax.
    (W)
    Dissipation Factor
    (mW/oC)  
    Thermal Time Constant (s) Dimensions (mm)
    Dmax Tmax F±1 Curved Lead Wire
    1 MF72-1D20 1 16 0.027 5 28 min 110 max 22.5 7 10 S
    2 MF72-1D25 1 20 0.021 7 30 min 130 max 29 8 10 S
    3 MF72-1D30 1 30 0.014 8 40 min 190 max 36 8.5 18 S
    4 MF72 2.5D15 2.5 9.5 0.044 3.5 22 min 75 max 17.5 6 7.5 17/5
    5 MF72-5D15 5 8 0.058 3.5 22 min 75 max 17.5 6 7.5 17/5
    6 MF72-5D20 5 12 0.047 5 28 min 110 max 22.5 7 10 S
    7 MF72-5D25 5 14 0.047 7 30 min 130 max 29 8 10 S
    8 MF72-10D15 10 7 0.098 3.5 22 min 75 max 17.5 6 7.5 17/5
    9 MF72-10D20 10 8 0.085 5 28 min 110 max 22.5 7 10 S
    10 MF72-10D25 10 10 0.084 7 30 min 130 max 29 8 10 S
    11 MF72-10D30 10 13 0.056 8 40 min 190 max 36 8.5 18 S

    a. S shows straight lead wire;
    b. 17/5:17 shows the long bend lead wire; 5 shows the short bend lead wire.

    Note:
    1.Unless particular indication,the allowable tolerance of the R25 Resistance is ±20%
    2.Encapsulation mode can be made per customer’s requirement.
    3.Wire shape kinked form can be selected.
    4.Can be custom-made per customer’s requirement.

    Item Part No. Resistance
    R 25(Ω)
    Max Steady State Current (A) Approx. Resistance Value at Maximum Current (Ω) Dissipation Factor
    (mW/oC)
    Thermal Time Constant (sec) Dimensions (mm)
    Dmax Tmax F±1
    1 MF72 5D13 5 5 0.125 15 68 15.5 6 7.5
    2 MF72-8D15 8 5 0.178 20 80 17.5 6 10/7.5
    3 MF72-20D20 20 6 0.201 30 98 22.5 7 10

    a. S shows straight lead wire;
    b. 17/5:17 shows the long bend lead wire; 5 shows the short bend lead wire.

    Note:
    1.Unless particular indication,the allowable tolerance of the R25 Resistance is ±20%
    2.Encapsulation mode can be made per customer’s requirement.
    3.Wire shape kinked form can be selected.
    4.Can be custom-made per customer’s requirement.

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