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Inrush Current Limiting Power NTC Thermistors
Power NTC thermistor 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.
Inrush Current Limiting Power NTC Thermistor Application
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.
Inrush Current Limiting Power NTC Thermistor Advantages:
·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.
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 power NTC thermistor application
Power NTC thermistor Load-temperature characteristics
Typical Application of Inrush Current Limiting Power NTC thermistors for Circuit Protection
Inrush Current Limiting Power NTC Thermistors Dimensions (mm)
AMWEI Inrush Current Limiting Power NTC Thermistors Data Sheet
Part No.
R25(Ω)
Max Stable Current(A)
Approx. Resistance Value at Maximum Current (Ω)
Dissipation Factor (mW/oC)
Thermal Time Constant (s)
Dimensions (mm)
D±2
Tmax
H
H 0
d±1
AMF72-10D5
5
0.7
0.771
9
16
6.5
5
9.5
16.5
5/ 2.5
AMF72-200D5
200
0.1
6.259
9
16
6.5
5
9.5
16.5
5/ 2.5
AMF72-5D7
5
2
0.283
14
26
8.5
5
11.5
18.5
5
AMF72-10D7
10
1
0.616
9
27
8.5
5
11.5
18.5
5
AMF72-22D7
22
0.6
1.108
9
27
8.5
5
11.5
18.5
5
AMF72-3D9
3
4
0.120
11
34
10.5
5.5
13.5
20.5
7.5 /5
AMF72-5D9
5
3
0.210
11
34
10.5
5.5
13.5
20.5
7.5 /5
AMF72-8D9
8
2
0.400
11
32
10.5
5.5
13.5
20.5
7.5 /5
AMF72-10D9
10
2
0.458
11
32
10.5
5.5
13.5
20.5
7.5 /5
AMF72-22D9
22
1
0.950
11
30
10.5
5.5
13.5
20.5
7.5 /5
AMF72-3D11
3
5
0.100
13
43
12.5
5.5
15.5
22.5
7.5 /5
AMF72-5D11
5
4
0.156
13
45
12.5
5.5
15.5
22.5
7.5 /5
AMF72-8D11
8
3
0.255
14
47
12.5
5.5
15.5
22.5
7.5 /5
AMF72-10D11
10
3
0.275
14
47
12.5
5.5
15.5
22.5
7.5 /5
AMF72-16D11
16
2
0.470
14
50
12.5
5.5
15.5
22.5
7.5 /5
AMF72-22D11
22
2
0.563
15
52
12.5
5.5
15.5
22.5
7.5 /5
AMF72-33D11
33
1.5
0.734
15
52
12.5
5.5
15.5
22.5
7.5 /5
AMF72-1.3D13
1.3
7
0.062
13
60
14.5
6
17.5
24.5
7.5
AMF72-3D13
3
6
0.092
14
60
14.5
6
17.5
24.5
7.5
AMF72-5D13
5
5
0.125
15
68
14.5
6
17.5
24.5
7.5
AMF72-10D13
10
4
0.206
15
65
14.5
6
17.5
24.5
7.5
AMF72-30D13
30
2.5
0.517
16
65
14.5
6
17.5
24.5
7.5
AMF72-3D15
3
7
0.075
18
76
16.5
6
19.5
26.5
10/7.5
AMF72-5D15
5
6
0.112
20
76
16.5
6
19.5
26.5
10/7.5
AMF72-8D15
8
5
0.178
20
80
16.5
6
19.5
26.5
10/7.5
AMF72-10D15
10
5
0.180
20
75
16.5
6
19.5
26.5
10/7.5
AMF72-30D15
30
3.5
0.438
18
75
16.5
6
19.5
26.5
10/7.5
AMF72-47D15
47
3
0.680
21
86
16.5
6
19.5
26.5
10/7.5
AMF72-0.7D20
0.7
12
0.018
25
89
21.5
7
24.5
31.5
10/7.5
AMF72-1.3D20
1.3
9
0.037
24
88
21.5
7
24.5
31.5
10/7.5
AMF72-3D20
3
8
0.055
24
88
21.5
7
24.5
31.5
10/7.5
AMF72-5D20
5
7
0.087
23
87
21.5
7
24.5
31.5
10/7.5
AMF72-8D20
8
6
0.142
25
105
21.5
7
24.5
31.5
10/7.5
AMF72-10D20
10
6
0.162
24
102
21.5
7
24.5
31.5
10/7.5
AMF72-0.7D25
0.7
13
0.014
30
120
26.5
8
\
\
10/7.5
AMF72-1.5D25
1.5
10
0.027
30
121
26.5
8
\
\
10/7.5
AMF72-3D25
3
9
0.044
32
124
26.5
8
\
\
10/7.5
AMF72-5D25
5
8
0.070
32
125
26.5
8
\
\
10/7.5
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 Numberof 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 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 B 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.
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