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 NTC Thermistors      Download PDF

MF72
Power NTC Thermistor
The MF72 series Power NTC Thermistors provide inrush current suppression for sensitive electronics. Connecting a MF72 in series with the power source will limit the current surges typically created at turn on. Once the circuit is energized the resistance of the MF72 will decrease rapidly to a very low value, power consumption can be ignored and there will be no effect on normal operating current. Using the MF72 Power NTC Thermistor is a most cost-effective way to curb surge current and protect sensitive electronics from damage.

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Application
Can be installed into the power circuits of:
• Power supplies and inverters
• Uninterruptible Power Supplies
• Energy saving lamps
• Electronic Ballasts
• Filament Protection of various types of lamps
• Some types of heaters
• For higher power circuits ask about the MF73
and MF74 series surge suppressors.

Characteristics
• Small Size and fast response
• High Power handling capability
• Fast response to surge current
• High material constant (B value)
• Low residual resistance
• Wide operating temperature range -55 to +200C
• R25 allowable tolerance is ±20%
• Long-term Stability and Reliability
• UL 1434 File# E241319
• CQC File# 04001010556

Specification

Dimensions


Part No./Dim (mm)/Sym
D
+2
-1
Tmax
d

+/- 0.05
F1

+/-1
F2

+/- 1.5
Straight Lead Wire
Curved Lead Wire
A

+/- .5
Lmin
b
L1min
L2+/-2
MF72- D5
7
5
0.6/0.45
5/2.5
3
25
17/5
8/5
1.65
MF72- D7
9
5
0.6
5
3
25
17/5
8/5
1.9
MF72- D9
11
5.5
0.8/0.6
7.5/5
5/3
25
17/5
8/5
2.3
MF72- D11
13
5.5
0.8
7.5/5
5/3
25
17/5
8/5
2.6
MF72- D13
15.5
6
0.8
7.5
5
25
17/5
8/5
2.6
MF72- D15
17.5
6
0.8
10/7.5
5
25
17/5
8/5
2.8
MF72- D20
22.5
7
1.0
10/7.5
/
25
/
/
3.5
MF72- D25
27.5
8
1.0
10
/
25
/
/
3.5
Remark
a, rated zero-power resistance
b, 17/5   17 indicates the long bent lead wire, 5 indicates the short bent lead wire (Fig. III)
Illustration:In general, the long bent lead wire is used, see figure II

Main Techno Parameter

Part NO.
R25
(Ω)
Max.
Steady State Current
(A)
Approx.R of Max.Cur
(Ω)
Dissi,Coef.
(mW/ÉC)
Thermal time Constant
(S)
Max. Load
Capacitance
UL Recognized
Operating Temp.
(ÉC)
120V/AC
240V/AC
MF72-5D5
5
1
0.353
6
20
188
47
 
-55 to +200
MF72-10D5
10
0.7
0.771
6
20
188
47
 
MF72-60D5
60
0.5
1.878
6
18
188
47
 
MF72-200D5
200
0.1
18.70
6
18
88
22
 
MF72-5D7
5
2
0.283
10
30
224
56
 
MF72-8D7
8
1
0.539
9
28
224
56
 
MF72-10D7
10
1
0.616
9
27
224
56
 
MF72-12D7
12
1
0.816
9
27
224
56
 
MF72-16D7
16
0.7
1.003
9
27
224
56
 
MF72-22D7
22
0.6
1.108
9
27
224
56
 
MF72-33D7
33
0.5
1.485
10
28
188
47
 
MF72-200D7
200
0.2
11.65
11
28
188
47
 
MF72-3D9
3
4
0.120
11
35
272
68
MF72-4D9
4
3
0.190
11
35
272
68
MF72-5D9
5
3
0.210
11
34
272
68
MF72-6D9
6
2
0.315
11
34
272
68
MF72-8D9
8
2
0.400
11
32
400
100
MF72-10D9
10
2
0.458
11
32
400
100
MF72-12D9
12
1
0.652
11
32
400
100
MF72-16D9
16
1
0.802
11
31
400
100
MF72-20D9
20
1
0.864
11
30
600
150
MF72-22D9
22
1
0.950
11
30
600
150
MF72-30D9
30
1
1.022
11
30
600
150
MF72-33D9
33
1
1.124
11
30
600
150
MF72-50D9
50
1
1.252
11
30
600
150
MF72-60D9
60
0.8
1.502
11
30
600
150
MF72-80D9
80
0.8
2.010
11
30
272
68
MF72-120D9
120
0.8
3.015
11
30
272
68
MF72-200D9
200
0.5
5.007
11
32
188
47
MF72-400D9
400
0.2
30.30
11
32
188
47
MF72-2.5D11
2.5
5
0.095
13
43
600
150
MF72-3D11
3
5
0.100
13
43
600
150
MF72-4D11
4
4
0.150
13
44
600
150
MF72-5D11
5
4
0.156
13
45
600
150
MF72-6D11
6
3
0.240
13
45
800
220
MF72-8D11
8
3
0.255
14
47
800
220
MF72-10D11
10
3
0.275
14
47
800
220
MF72-12D11
12
2
0.462
14
48
800
220
MF72-16D11
16
2
0.470
14
50
800
220
MF72-20D11
20
2
0.512
15
52
800
220
MF72-22D11
22
2
0.563
15
52
800
220
MF72-30D11
30
1.5
0.667
15
52
800
220
 
MF72-33D11
33
1.5
0.734
15
52
800
220
MF72-50D11
50
1.5
1.021
15
52
800
220
MF72-60D11
60
1.5
1.215
15
52
800
220
MF72-80D11
80
1.2
1.656
15
52
600
150
MF72-1.3D13
1.3
7
0.062
13
60
880
220
MF72-1.5D13
1.5
7
0.073
13
60
880
220
MF72-2.5D13
2.5
6
0.088
13
60
880
220
MF72-3D13
3
6
0.092
14
60
880
220
MF72-4D13
4
5
0.120
15
67
880
220
MF72-5D13
5
5
0.125
15
68
880
220
MF72-6D13
6
4
0.170
15
65
880
220
MF72-7D13
7
4
0.188
15
65
1320
330
MF72-8D13
8
4
0.194
15
60
1320
330
MF72-10D13
10
4
0.206
15
65
1320
330
MF72-12D13
12
3
0.316
16
65
1320
330
MF72-15D13
15
3
0.335
16
60
1320
330
MF72-16D13
16
3
0.338
16
60
1320
330
MF72-20D13
20
3
0.372
16
65
1320
330
MF72-30D13
30
2.5
0.517
16
65
1320
330
MF72-47D13
47
2
0.810
17
65
880
220
MF72-120D13
120
1.5
2.124
16
65
880
220
MF72-1.3D15
1.3
8
0.048
18
68
1320
330
MF72-1.5D15
1.5
8
0.052
19
69
1320
330
MF72-3D15
3
7
0.075
18
76
1320
330
MF72-5D15
5
6
0.112
20
76
1880
470
MF72-6D15
6
5
0.155
20
80
1880
470
MF72-7D15
7
5
0.173
20
80
1880
470
MF72-8D15
8
5
0.178
20
80
1880
470
MF72-10D15
10
5
0.180
20
75
1880
470
MF72-12D15
12
4
0.250
20
75
1880
470
MF72-15D15
15
4
0.268
21
85
1880
470
MF72-16D15
16
4
0.276
21
70
1880
470
MF72-20D15
20
4
0.288
17
86
1880
470
MF72-30D15
30
3.5
0.438
18
75
1320
330
MF72-47D15
47
3
0.680
21
86
1320
330
MF72-120D15
120
2.5
1.652
22
87
1320
330
MF72-0.7D20
0.7
12
0.018
25
112
1880
470
MF72-1.3D20
1.3
9
0.037
24
113
1880
470
MF72-3D20
3
8
0.055
24
113
1880
470
MF72-5D20
5
7
0.087
23
112
2240
560
MF72-6D20
6
6
0.113
25
114
2240
560
MF72-8D20
8
6
0.142
25
115
2240
560
MF72-10D20
10
6
0.162
24
113
2240
560
MF72-12D20
12
5
0.195
24
114
2720
680
MF72-16D20
16
5
0.212
25
113
2720
680
MF72-0.7D25
0.7
13
0.014
30
151
2240
560
 
MF72-1.5D25
1.5
10
0.027
30
152
2240
560
 
MF72-3D25
3
9
0.044
32
150
2240
560
 
MF72-5D25
5
8
0.070
32
151
2720
680
 
MF72-8D25
8
7
0.114
33
151
2720
680
 
MF72-10D25
10
7
0.130
32
150
2720
680
 
MF72-12D25
12
6
0.156
32
150
3280
820
 
MF72-16D25
16
6
0.160
35
152
3280
820
 

Note: Unless otherwise specified, the allowable tolerance of R25 is +/- 20%

 

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