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Inrush Current Limiting Power NTC Thermistors For Switch Mode Power Supply

Categories NTC Thermistor
Place of Origin: Dongguan,Guangdong,China
Brand Name: UCHI
Certification: UL.VDE.SGS.
Model Number: MF72
MOQ: 5000PCS
Price: Negotiable
Packaging Details: Bulk/Ammo/Reel
Delivery Time: 3~5 working days
Payment Terms: T/T,Paypal,Western Union,Money gram
Supply Ability: 8000,000,000PCS Per Month
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    Inrush Current Limiting Power NTC Thermistors For Switch Mode Power Supply

    Inrush Current Limiting Power NTC Thermistors For Switch Mode Power Supply

    Quick Detail:

    ·Low cost solid state device for inrush current supression.
    ·Minimise line current distortion and radio noise.
    ·Protect switches, rectifier diodes and smoothing capacitors against premature failures.
    ·Prevent fuse from blowing in error.

    Description:

    Power NTC thermistor can be a cost effective device to limit the amount of inrush current in a switching power supply or other devices when the power is first turned on. Power NTC thermistor limits surge current by functioning as a power resistor which drops from a high cold resistance to a low hot resistance when heated by the current flowing through it.
    Inrush-current limiters power NTC thermistor protect circuits from undesirably high currents, suppressing high inrush current surges, while its resistance remains negligible low during continuous operation. Thanks to their low resistance in the operating state, Power thermistor have a considerably lower power dissipation than the fixed resistors frequently used for this application.

    Applications:

    Limiting surge current, suitable for the protection of switch mode power supply, UPS power, transformers, motors, various electric heating utensil, energy saving lights, ballast, various power circuit, amplifiers, colored displayer, monitors, color TV, filament protection, etc.
    Power thermistor components can also be used for the soft starting of motors, for example in vacuum cleaners with continuous currents of up to 20 A.

    Specifications:

    Inrush Current Limiting Power NTC Thermistor Features:

    ·Resin coated disk thermistor with uninsulated lead-wires.
    ·Suitable for both AC and DC circuits up to a voltage of 265 V(rms).
    ·Wide range of resistance, current and dimension.
    ·Excellent mechanical strength.
    ·Suitable for PCB mounting.

    Comparison curve with and without Inrush Current Limiting Power NTC thermistor application

    Comparison curve with and without Inrush Current Limiting power NTC thermistor

    Inrush Current Limiting Power NTC thermistor Load-temperature characteristics

    Inrush Current Limiting Power NTC thermistor
    Load-temperature characteristics
    Typical Application of Inrush Current Limiting Power NTC thermistors for Circuit Protection

    Basic circuit diagram NTC thermistor for diode protection

    Basic circuit diagram NTC thermistor for diode protection

    NTC Thermistor for inrush current protection circuit

    Possible locations of NTC Thermistors inrush current limiters

    Typical power supply circuit

    Typical power supply circuit

    Power thermistor application circuits

    Power NTC thermistors application circuits

    Inrush Current Limiting Power NTC thermistor for Circuit Protection application

    Another example NTC Thermistor for inrush current protection circuit

    Inrush Current Limiting Power NTC Thermistors Dimensions (mm)

    Inrush Current Limiting Power NTC Thermistor Outlook

    Inrush Current Limiting Power NTC Thermistors Data Sheet

    Part No.

    R25
    (ohm)

    Max
    Stable
    Current
    (A)

    Approx.
    Resistance
    value at
    max current
    (Ω)

    Dissipation
    Factor
    (mW/oC)

    Thermal
    Time
    Constant
    (sec)

    Dimensions (mm)

    Dmax

    Tmax

    H

    H 0

    d±1

    MF72-3D9

    3 ohm

    4A

    0.120

    11

    34

    11

    5.5

    13.5

    20.5

    7.5 /5

    MF72-5D9

    5 ohm

    3A

    0.210

    11

    34

    11

    5.5

    13.5

    20.5

    7.5 /5

    MF72-8D9

    8 ohm

    2A

    0.400

    11

    32

    11

    5.5

    13.5

    20.5

    7.5 /5

    MF72-10D9

    10 ohm

    2A

    0.458

    11

    32

    11

    5.5

    13.5

    20.5

    7.5 /5

    MF72-16D9

    16 ohm

    1A

    0.802

    11

    31

    11

    5.5

    13.5

    20.5

    7.5 /5

    MF72-22D9

    22 ohm

    1A

    0.950

    11

    30

    11

    5.5

    13.5

    20.5

    7.5 /5

    MF72-33D9

    33 ohm

    1A

    1.124

    11

    30

    11

    5.5

    13.5

    20.5

    7.5 /5

    MF72-50D9

    50 ohm

    1A

    1.252

    11

    30

    11

    5.5

    13.5

    20.5

    7.5 /5

    MF72-80D9

    80 ohm

    0.8A

    2.010

    11

    30

    11

    5.5

    13.5

    20.5

    7.5 /5

    MF72-3D11

    3 ohm

    5A

    0.100

    13

    43

    13

    5.5

    15.5

    22.5

    7.5 /5

    MF72-5D11

    5 ohm

    4A

    0.156

    13

    45

    13

    5.5

    15.5

    22.5

    7.5 /5

    MF72-8D11

    8 ohm

    3A

    0.255

    14

    47

    13

    5.5

    15.5

    22.5

    7.5 /5

    MF72-10D11

    10 ohm

    3A

    0.275

    14

    47

    13

    5.5

    15.5

    22.5

    7.5 /5

    MF72-12D11

    12 ohm

    2A

    0.462

    14

    48

    13

    5.5

    15.5

    22.5

    7.5 /5

    MF72-16D11

    16 ohm

    2A

    0.470

    14

    50

    13

    5.5

    15.5

    22.5

    7.5 /5

    MF72-20D11

    20 ohm

    2A

    0.512

    15

    52

    13

    5.5

    15.5

    22.5

    7.5 /5

    MF72-22D11

    22 ohm

    2A

    0.563

    15

    52

    13

    5.5

    15.5

    22.5

    7.5 /5

    MF72-33D11

    33 ohm

    1.5A

    0.734

    15

    52

    13

    5.5

    15.5

    22.5

    7.5 /5

    MF72-50D11

    50 ohm

    1.5A

    1.021

    15

    52

    13

    5.5

    15.5

    22.5

    7.5 /5

    MF72-60D11

    60 ohm

    1.5A

    1.215

    15

    52

    13

    5.5

    15.5

    22.5

    7.5 /5

    MF72-1.3D13

    1.3 ohm

    7A

    0.062

    13

    60

    15.5

    6

    17.5

    24.5

    7.5

    MF72-3D13

    3 ohm

    6A

    0.092

    14

    60

    15.5

    6

    17.5

    24.5

    7.5

    MF72-5D13

    5 ohm

    5A

    0.125

    15

    68

    15.5

    6

    17.5

    24.5

    7.5

    MF72-10D13

    10 ohm

    4A

    0.206

    15

    65

    15.5

    6

    17.5

    24.5

    7.5

    MF72-15D13

    15 ohm

    3A

    0.335

    16

    60

    15.5

    6

    17.5

    24.5

    7.5

    MF72-30D13

    30 ohm

    2.5A

    0.517

    16

    65

    15.5

    6

    17.5

    24.5

    7.5

    MF72-47D13

    47 ohm

    2A

    0.810

    17

    65

    15.5

    6

    17.5

    24.5

    7.5

    MF72-1.3D15

    1.3 ohm

    8A

    0.048

    18

    68

    17.5

    6

    19.5

    26.5

    10/7.5

    MF72-1.5D15

    1.5 ohm

    8A

    0.052

    18

    69

    17.5

    6

    19.5

    26.5

    10/7.5

    MF72-3D15

    3 ohm

    7A

    0.075

    18

    76

    17.5

    6

    19.5

    26.5

    10/7.5

    MF72-5D15

    5 ohm

    6A

    0.112

    20

    76

    17.5

    6

    19.5

    26.5

    10/7.5

    MF72-8D15

    8 ohm

    5A

    0.178

    20

    80

    17.5

    6

    19.5

    26.5

    10/7.5

    MF72-10D15

    10 ohm

    5A

    0.180

    21

    85

    17.5

    6

    19.5

    26.5

    10/7.5

    MF72-15D15

    15 ohm

    4A

    0.268

    20

    75

    17.5

    6

    19.5

    26.5

    10/7.5

    MF72-30D15

    30 ohm

    3.5A

    0.438

    18

    75

    17.5

    6

    19.5

    26.5

    10/7.5

    MF72-47D15

    47 ohm

    3A

    0.680

    21

    86

    17.5

    6

    19.5

    26.5

    10/7.5

    MF72-0.7D20

    0.7 ohm

    12A

    0.018

    25

    89

    22.5

    7

    24.5

    31.5

    10/7.5

    MF72-1.3D20

    1.3 ohm

    9A

    0.037

    24

    88

    22.5

    7

    24.5

    31.5

    10/7.5

    MF72-3D20

    3 ohm

    8A

    0.055

    24

    88

    22.5

    7

    24.5

    31.5

    10/7.5

    MF72-5D20

    5 ohm

    7A

    0.087

    23

    87

    22.5

    7

    24.5

    31.5

    10/7.5

    MF72-8D20

    8 ohm

    6A

    0.142

    25

    105

    22.5

    7

    24.5

    31.5

    10/7.5

    MF72-10D20

    10 ohm

    6A

    0.162

    24

    102

    22.5

    7

    24.5

    31.5

    10/7.5

    newly developed inrush current limiting power NTC thermistor increased max. operating current.

    Part No.

    R25

    (ohm)

    Max Stable 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

    H

    H 0

    d

    Pin

    form

    D15mm

    2.5ohm/9.5A

    2.5 ohm

    9.5A

    0.044

    3.5W

    22 min

    75 max

    17.5

    6

    19.5

    26.5

    7.5

    inner kinked

    D15mm

    5 ohm/8A

    5 ohm

    8A

    0.058

    3.5W

    22 min

    75 max

    17.5

    6

    19.5

    26.5

    7.5

    inner kinked

    D15mm,

    10 ohm/7A

    10 ohm

    7A

    0.098

    3.5W

    22 min

    75 max

    17.5

    6

    19.5

    26.5

    7.5

    inner kinked

    D20mm

    1 ohm/16A

    1 ohm

    16A

    0.027

    5W

    28 min

    110 max

    22.5

    7

    24.7

    /

    10

    straight

    D20mm

    5 ohm/12A

    5 ohm

    12A

    0.047

    5W

    28 min

    110 max

    22.5

    7

    24.7

    /

    10

    straight

    D20mm,

    10 ohm/8A

    10 ohm

    8A

    0.085

    5W

    28 min

    110 max

    22.5

    7

    24.7

    /

    10

    straight

    D25mm,

    1 ohm/20A

    1 ohm

    20A

    0.021

    7W

    30 min

    130 max

    29

    8

    33

    /

    10

    straight

    D25mm

    , 5 ohm/14A

    5 ohm

    14A

    0.047

    7W

    30 min

    130 max

    29

    8

    33

    /

    10

    straight

    D25mm,

    10 ohm/10A

    10 ohm

    10A

    0.084

    7W

    30 min

    130 max

    29

    8

    33

    /

    10

    straight

    D30mm,

    1 ohm/30A

    1ohm

    30A

    0.014

    8W

    40 min

    190 max

    36

    8.5

    40

    /

    18

    straight

    D30mm,

    10 ohm/13A

    10 ohm

    13A

    0.056

    8W

    40 min

    190 max

    36

    8.5

    40

    /

    18

    straight

    Inrush Current Limiting Power NTC thermistor Reliability Data
    Test
    Standard
    Test Conditions
    ΔR25/R25 (typical)
    Remarks

    Storage in dry heat

    IEC 60068-2-2

    Storage at upper category temperature Temperature: 125oC Time: 1000h

    <10%

    No visible damage

    Storage in damp heat, steady state

    IEC 60068-2-3

    Temperature of air: 40oC Relative humidity of air: 93% Duration: 21 days

    <5%

    No visible damage

    Rapid temperature cycling

    IEC 60068-2-14

    Lower test temperature: -55oC Upper test temperature: 125oC Number of cycles: 10

    <10%

    No visible damage

    Endurance

    I=Imax t: 1000h

    <10%

    No visible damage

    Cyclic endurance

    I=Imax, 1000 cycles On-time=1 min Cooling time=6 min

    <10%

    Transient load

    Capacitance=CT Number of cycles: 1000

    <5%

    No visible damage

    Reference information for selecting inrush current limiting power NTC thermistor

    1) Maximum operating current > Actual operating current in the power loop
    2) Rated zero power resistance at 25C
    <img data-cke-saved-src="http://www.amwei.com/pima/Resistance%20calculation.gif" src="http://www.amwei.com/pima/Resistance%20calculation.gif" "alt="Resistance calculation">
    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
    3) The larger Beta value, the smaller residual resistance, the smaller operating temperature rising.
    4) Generally, the larger product of time constant and dissipation coefficient, the larger NTC thermal capacity, the more powerful NTC thermistor surge current restraining capacity.

    Inrush Current Limiting Power NTC Thermistor Application Precautions

    1) For inrush current limiting, the NTC thermistor must be connected in series with the load circuit. Several inrush current limiters can also be connected in series for higher damping. Inrush current limiters must not be connected in parallel.
    2) In general inrush current limiters require time to get back to cold state, in which they can provide adequate inrush current limiting due to their high resistance. The cooling down time depends on ambient conditions.
    3) It should be considered that the surrounding area of NTC Thermistor may become quite hot.Ensure the adjacent components are placed at sufficient distance from a thermistor to allow for proper cooling time of the thermistor.
    4) Make sure that adjacent materials are designed for operation at temperatures comparable to the surface temperature of the thermistor. Make sure that surrounding parts and materials can withstand this temperature.
    5) Make sure that thermistors are adequately ventilated to avoid overheating.
    6) Avoid comtamination of the thermistor surface.
    7) Avoid contact of NTC thermistors with any liquids and solvents. Ensure that no water enters an NTC thermistor.

    Competitive Advantage:

    1. Factory supply directly

    2. Completed certificates such as UL,VDE,SGS,etc and high quality available

    3. Quick delivery

    4. Best after-sales services

    5. OEM & ODM available

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