Current Limiting Thermistor NTC Chip Disc Inrush Current Limiter
ICL 20D-20 20mm 5 Amp 20R For Power Supply Ballast 552
Brief Introduction
MF72 series NTC thermistor devices for limiting surge current 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.
Main parameters and dimension
| Type | Rated Resistance | (A) | D | L | F | Dimensions (Unit:mm) |
Max. Steady State Current | Dmax | Lmin | F±1 | Tmax | d |
| 5D-5 | 5 | 1 | 6.5 | 25 | 5.0/2.5 | 5 | 0.55/0.45 |
| 10D-5 | 10 | 0.7 | 6.5 | 25 | 5.0/2.5 | 5 | 0.55/0.45 |
| 20D-5 | 20 | 0.5 | 6.5 | 25 | 5.0/2.5 | 5 | 0.55/0.45 |
| 5D-7 | 5 | 2 | 8.5 | 25 | 5 | 5 | 0.55 |
| 8D-7 | 8 | 1 | 8.5 | 25 | 5 | 5 | 0.55 |
| 10D-7 | 10 | 1 | 8.5 | 25 | 5 | 5 | 0.55 |
| 12D-7 | 12 | 1 | 8.5 | 25 | 5 | 5 | 0.55 |
| 16D-7 | 16 | 0.7 | 8.5 | 25 | 5 | 5 | 0.55 |
| 20D-7 | 20 | 0.6 | 8.5 | 25 | 5 | 5 | 0.55 |
| 22D-7 | 22 | 0.6 | 8.5 | 25 | 5 | 5 | 0.55 |
| 33D-7 | 33 | 0.5 | 8.5 | 25 | 5 | 5 | 0.55 |
| 3D-9 | 3 | 4 | 10.5 | 25 | 7.5/5.0 | 5.5 | 0.78/0.55 |
| 4D-9 | 4 | 4 | 10.5 | 25 | 7.5/5.0 | 5.5 | 0.78/0.55 |
| 5D-9 | 5 | 3 | 10.5 | 25 | 7.5/5.0 | 5.5 | 0.78/0.55 |
| 6D-9 | 6 | 2 | 10.5 | 25 | 7.5/5.0 | 5.5 | 0.78/0.55 |
| 8D-9 | 7 | 2 | 10.5 | 25 | 7.5/5.0 | 5.5 | 0.78/0.55 |
| 10D-9 | 10 | 2 | 10.5 | 25 | 7.5/5.0 | 5.5 | 0.78/0.55 |
| 12D-9 | 12 | 1 | 10.5 | 25 | 7.5/5.0 | 5.5 | 0.78/0.55 |
| 16D-9 | 16 | 1 | 10.5 | 25 | 7.5/5.0 | 5.5 | 0.78/0.55 |
| 20D-9 | 20 | 1 | 10.5 | 25 | 7.5/5.0 | 5.5 | 0.78/0.55 |
| 22D-9 | 22 | 1 | 10.5 | 25 | 7.5/5.0 | 5.5 | 0.78/0.55 |
| 30D-9 | 30 | 1 | 10.5 | 25 | 7.5/5.0 | 5.5 | 0.78/0.55 |
| 33D-9 | 33 | 1 | 10.5 | 25 | 7.5/5.0 | 5.5 | 0.78/0.55 |
| 50D-9 | 50 | 1 | 10.5 | 25 | 7.5/5.0 | 5.5 | 0.78/0.55 |
| 60D-9 | 60 | 0.8 | 10.5 | 25 | 7.5/5.0 | 5.5 | 0.78/0.55 |
| 2.5D-11 | 2.5 | 5 | 12.5 | 25 | 7.5/5.0 | 5.5 | 0.78 |
| 3D-11 | 3 | 5 | 12.5 | 25 | 7.5/5.0 | 5.5 | 0.78 |
| 4D-11 | 4 | 4 | 12.5 | 25 | 7.5/5.0 | 5.5 | 0.78 |
| 5D-11 | 5 | 4 | 12.5 | 25 | 7.5/5.0 | 5.5 | 0.78 |
| 6D-11 | 6 | 3 | 12.5 | 25 | 7.5/5.0 | 5.5 | 0.78 |
| 8D-11 | 8 | 3 | 12.5 | 25 | 7.5/5.0 | 5.5 | 0.78 |
| 10D-11 | 10 | 3 | 12.5 | 25 | 7.5/5.0 | 5.5 | 0.78 |
| 12D-11 | 12 | 2 | 12.5 | 25 | 7.5/5.0 | 5.5 | 0.78 |
| 16D-11 | 16 | 2 | 12.5 | 25 | 7.5/5.0 | 5.5 | 0.78 |
| 20D-11 | 20 | 2 | 12.5 | 25 | 7.5/5.0 | 5.5 | 0.78 |
| 22D-11 | 22 | 2 | 12.5 | 25 | 7.5/5.0 | 5.5 | 0.78 |
| 30D-11 | 30 | 1.5 | 12.5 | 25 | 7.5/5.0 | 5.5 | 0.78 |
| 33D-11 | 33 | 1.5 | 12.5 | 25 | 7.5/5.0 | 5.5 | 0.78 |
| 1.3D-13 | 1.3 | 7 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 1.5D-13 | 1.5 | 6 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 3D-13 | 3 | 6 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 4D-13 | 4 | 5 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 5D-13 | 5 | 5 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 6D-13 | 6 | 4 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 7D-13 | 7 | 4 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 8D-13 | 8 | 4 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 10D-13 | 10 | 4 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 12D-13 | 12 | 3 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 15D-13 | 15 | 3 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 16D-13 | 16 | 3 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 20D-13 | 20 | 3 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 30D-13 | 30 | 2.5 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 47D-13 | 47 | 2 | 14.5 | 25 | 7.5 | 6 | 0.78 |
| 1.3D-15 | 1.3 | 8 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 1.5D-15 | 1.8 | 8 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 3D-15 | 3 | 7 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 5D-15 | 5 | 6 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 6D-15 | 6 | 5 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 7D-15 | 7 | 5 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 8D-15 | 8 | 5 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 10D-15 | 10 | 5 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 12D-15 | 12 | 4 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 15D-15 | 15 | 4 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 16D-15 | 16 | 4 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 20D-15 | 20 | 4 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 30D-15 | 30 | 3 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 33D-15 | 33 | 3 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 47D-15 | 47 | 3 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 50D-15 | 50 | 3 | 16.5 | 25 | 7.5 | 6 | 0.78 |
| 0.7D-20 | 0.7 | 12 | 21.5 | 25 | 10/7.5 | 7 | 1 |
| 1.3D-20 | 1.3 | 9 | 21.5 | 25 | 10/7.5 | 7 | 1 |
| 2.2D-20 | 2.2 | 8 | 21.5 | 25 | 10/7.5 | 7 | 1 |
| 2.5D-20 | 2.5 | 8 | 21.5 | 25 | 10/7.5 | 7 | 1 |
| 3D-20 | 3 | 8 | 21.5 | 25 | 10/7.5 | 7 | 1 |
| 5D-20 | 5 | 7 | 21.5 | 25 | 10/7.5 | 7 | 1 |
| 6D-20 | 6 | 6 | 21.5 | 25 | 10/7.5 | 7 | 1 |
| 8D-20 | 8 | 6 | 21.5 | 25 | 10/7.5 | 7 | 1 |
| 10D-20 | 10 | 6 | 21.5 | 25 | 10/7.5 | 7 | 1 |
| 12D-20 | 12 | 5 | 21.5 | 25 | 10/7.5 | 7 | 1 |
| 16D-20 | 16 | 5 | 21.5 | 25 | 10/7.5 | 7 | 1 |
NTC Thermistor Application
1. Conversion power supply, switch power supply, UPS power
2. Power supply circuit, electronic circuit of equipments
3. Electric heater
4. Electronic ballast
5. Oscillight,display
6. Filament protection of bulb,electronic energy-saving lamps and
other lighting lamps
Working principle
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 currentmeasures must be took
effectively.When current is applied on NTC thermistor directly, NTC
resistance may decrease with the heating of NTC thermistor
speedily. Power type NTC thermistor has a specified zero
powerresistance, 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 candecrease 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
mostbrief 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.
Main parameter:
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 ℃
Advantages
MF72 series thermistors are used for limiting the Inrush Current in
the power supply loop of every kinds of power supply, ballast / CFL
etc. and the heating loop of CRT of color TV / monitor, heater,
filament etc.
The MF72 series thermistors is the radial leads resin coating type
products, it has the characteristic of small bulk, high power,
strong limiting of inrush current, quick response, long life, high
reliability, etc.
The temperature is decreased while the Material Consistent(B) of
thermisters is increasing and the Remain Resistance is decreasing.
The higher is the Thermal Capacity, the stronger is the capability
of limiting the Inrush Current. It is direct proportion to the
product of the Thermal Time Constant (T) and Thermal Dissipation
Constant (d) .
The MF72 series thermistors has so wide application area, which is
mainly used in Switching Power Supply, UPS Power Supply, CFL,
Ballast, Circuitry of Power Supply, etc.
