NTC & PTC Thermistors

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.

MF72

Applications

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

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MF72

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 Dmax Tmax d
+/- 0.05

Fig. II/I
F1
+/-1

Fig. II/I
F2
+/-1.5

Fig. II/I
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 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

Add suffix "L" + Fig. # to specify optional leads.

* Straight Leads Are Standard
Main Techno Parameter
Part NO. R25
(Ω)
Max.
Steady State Current
(A)
Approx.R of Max.Cur
(Ω)
Dissi,Coef.
(mW/ƒC)
Thermal time Constant
(S)
Max. Load
Capacitance
in uF
UL Recognized Operating Temp.
(ƒC)
120 VAC 240 VAC
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 0.3 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 1.2 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 1.8 1.652 22 87 1320 330
MF72-0.7D20 0.7 11 0.018 25 89 1880 470
MF72-1.3D20 1.3 9 0.037 24 88 1880 470
MF72-3D20 3 8 0.055 24 88 1880 470
MF72-5D20 5 7 0.087 23 87 2240 560
MF72-6D20 6 6 0.113 25 103 2240 560
MF72-8D20 8 6 0.142 25 105 2240 560
MF72-10D20 10 6 0.162 24 102 2240 560
MF72-12D20 12 5 0.195 24 100 2720 680
MF72-16D20 16 5 0.212 25 100 2720 680
MF72-0.7D25 0.7 12 0.014 30 120 2240 560  
MF72-1.5D25 1.5 10 0.027 30 121 2240 560  
MF72-3D25 3 9 0.044 32 124 2240 560  
MF72-5D25 5 8 0.070 32 125 2720 680  
MF72-8D25 8 7 0.114 33 125 2720 680  
MF72-10D25 10 7 0.130 32 125 2720 680  
MF72-12D25 12 6 0.156 32 126 3280 820  
MF72-16D25 16 6 0.160 35 126 3280 820  

Note: Unless otherwise specified, the allowable tolerance of R25 is +/- 20%
Specifications may change without notice.