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 |