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High Power Inrush Current Limiter

Inrush Current Limiters

Power NTC Thermistor The MF73T-1 series Power NTC Thermistors provide inrush current suppression for sensitive electronics. Connecting a MF73T-1 in series with the power source will limit the current surges typically created at turn on.

MF73T-1

Applications

• High power switching power supplies, Power conversion, UPS power.
• High power battery charger, electric vehicle battery charger.
• High power LED light, high power electronic energy saving lamps and other lamps.

Characteristics

• Small size, high power, reliable surge current protection.
• High material constant (B value),
• Low residual resistance
• High steady state current, long lasting, high reliability
• Convenient for PCB installation, wide operating range

Specification

Dimensions

D15 D20 D25 D30 D35
Chip Dimensions ø 15 ø 20 ø 25 ø 30 ø 35
(Dmax)
Overall Diameter (mm)
17.5 22.5 29 36 41
(Tmax)
Thickness (mm)
6 7 8 8.5 10
(F ± 1.5)
Pitch (mm)
7.5 10.0 10.0 10.0 * 18 18 > Add suffix
“Pxx” to specify the Pitch (F) or> “Dxx” for Diameter of the leads (d)
(d ± 0.05)
Dia of Leads (mm)
0.8 1.0 1.0 1.2 * 1.6 1.8 * 2.0
(L) min
Length of Leads (mm)
25 25 25 25 25
(L1) min
Length of Leads (mm)
17 17 17
Standard Leads
Figure
(I)
Inside kink
(II)
Straight
(II)
Straight
(II)
Straight
(II)
Straight
> Add suffix “L” + figure # to
part number to specify optional leads
Optional Leads
Figure
(II)
Straight
(III)
Outside kink
(III)
Outside kink
Weight (g).
Approx
3.1 6.2 8.8 20.5 28.8

Illustration:In general, the long bent lead wire is used, see figure II * Standard

Technical Specifications

Working Temperature: -55~200†C

Part NO.
MF73T-1
Res +20%
(Ω)
Max. Steady
State Current
lmax (A)
Approx. R
of MaxCurrent
Rmax (Ω)
ø15mm Chip Diameter
Max Rated Power Pmax (W): 3.5
Dissipation Coefficient (mW/†C): ≥ 22
Thermal Time Constant (S): ≤ 75
1.3/10 1.3 10 0.034
1.5/10 1.5 10 0.036
2.5/9.5 2.5 9.5 0.044
5/8 5 8 0.058
6/7 6 7 0.069
7/7 7 7 0.078
8/7 8 7 0.084
10/7 10 7 0.098
12/6 12 6 0.116
15/6 16 6 0.129
20/6 20 6 0.136
30/5 30 5 0.165
47/4 47 4 0.257
120/2.5 120 2.5 0.652
Part NO.
MF73T-1
Res +20%
(Ω)
Max. Steady
State Current
lmax (A)
Approx. R
of MaxCurrent
Rmax (Ω)
ø20mm Chip Diameter
Max Rated Power Pmax (W): 5.0
Dissipation Coefficient (mW/†C): ≥ 28
Thermal Time Constant (S): ≤ 110
0.7/16 0.7 16 0.026
1/16 1 16 0.027
1.5/15 1.5 15 0.030
2/14 2 14 0.035
2.5/13 2.5 13 0.038
3/12 3 12 0.040
4/12 4 12 0.043
4.7/12 4.7 12 0.046
5/12 5 12 0.047
6/11 6 11 0.052
6.8/10 6.8 10 0.055
7/9 7 9 0.056
10/8 10 8 0.085
12/7.5 12 7.5 0.098
15/7 15 7 0.112
18/7 18 7 0.123
20/7 20 7 0.132
Part NO.
MF73T-1
Res +20%
(Ω)
Max. Steady
State Current
lmax (A)
Approx. R
of MaxCurrent
Rmax (Ω)
ø25mm Chip Diameter
Max Rated Power Pmax (W): 7.0
Dissipation Coefficient (mW/†C): ≥ 30
Thermal Time Constant (S): ≤ 130
0.5/22 0.5 22 0.017
0.7/22 0.7 22 0.017
1/20 1 20 0.021
1.5/19 1.5 19 0.024
2/18 2 18 0.026
2.5/16 2.5 16 0.029
3/15.5 3 15.5 0.032
4/15 4 15 0.039
4.7/14 4.7 14 0.044
5/14 5 14 0.047
6.8/12 6.8 12 0.061
7/11 7 11 0.064
8/10 8 10 0.079
10/10 10 10 0.084
12/9 12 9 0.102
15/8 15 8 0.117
18/8 18 8 0.132
20/8 20 8 0.132
Part NO.
MF73T-1
Res +20%
(Ω)
Max. Steady
State Current
lmax (A)
Approx. R
of MaxCurrent
Rmax (Ω)
ø30mm Chip Diameter
Max Rated Power Pmax (W): 8.0
Dissipation Coefficient (mW/†C): ≥ 40
Thermal Time Constant (S): ≤ 190
0.5/30 0.5 30 0.013
1/30 1 30 0.014
1.5/25 1.5 25 0.016
2/23 2 23 0.019
2.5/20 2.5 20 0.023
3/19.5 3 19.5 0.026
4/19 4 19 0.031
4.7/18 4.7 18 0.035
5/17 5 17 0.037
6.8/16 6.8 16 0.043
7/15 7 15 0.044
8/14 8 14 0.049
10/13 10 13 0.056
12/12 12 12 0.067
15/11 15 11 0.078
18/10 18 10 0.092
29/9 20 9 0.113
Part NO.
MF73T-1
Res +20%
(Ω)
Max. Steady
State Current
lmax (A)
Approx. R
of MaxCurrent
Rmax (Ω)
ø35mm Chip Diameter
Max Rated Power Pmax (W): 9.0
Dissipation Coefficient (mW/†C): ≥ 55
Thermal Time Constant (S): ≤ 280
0.5/32 0.5 32 0.01
1/32 1 32 0.011
1.5/28 1.5 28 0.013
2/25 2 25 0.017
2.5/23 2.5 23 0.020
3/22 3 22 0.023
4/21 4 21 0.026
4.7/20 4.7 20 0.029
5/19 5 19 0.030
6.8/18 6.8 18 0.035
7/17 7 17 0.037
8/16 8 16 0.041
10/15 10 15 0.045
12/14 12 14 0.051
15/13 15 13 0.060
18/11 18 11 0.072
20/10 20 10 0.089