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Address: No.1, Yixiang ,Liwu Industrial Park,Liwuyuan Village,Xihu District, Shilong Town,Dongguan 523325,Guangdong ,China
Contact name:James Lai
Dongguan Ampfort Electronics Co., Ltd. |
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High Temperature Thinking Murata TDK Epcos Semitec Power Thermistor NTC Replacement MF73
Application Of The Power Thermistor NTC Replacement MF73
Various high-power switching power supplies, UPS power supplies,
and conversion power supplies.
Electric car chargers, charging piles.
Motor drive device, high-power servo motor drive, logic controller.
High-power plasma welding machine, cutting machine, high-power
lighting lamps.
Nuclear magnetic resonance equipment, high-power audio power
amplifier, high-power toroidal transformer.
Solar panel array of high-capacity power inverter.
Industrial robots driven by high-voltage power supplies,
low-voltage smart electrical cabinets.
Features Of The Power Thermistor NTC Replacement MF73
● Reliable structure and easy installation.
● Strong ability to suppress surge current and high energy absorption.
● The working steady-state current is large.
● Long life and high reliability.
Dimensions Of The Power Thermistor NTC Replacement MF73 (mm)
Curved
| Body size | Φ40 | Φ45 | Φ50 |
| Diameter(Dmax) | 45 | 50 | 55 |
| Thickness(Imax) | 18 | 18 | 18 |
| Pitch(F±15) | 22.5 | 22.5 | 22.5 |
| Lead length(L2) | 20 | 20 | 20 |
| Lead width(W±02 | 8 | 8 | 8 |
| Lead thickness(H±0.1) | 1.0 | 1.0 | 1.0 |
Straight
| Body size | Φ40 | Φ45 | Φ50 |
| Diameter(Dmax) | 45 | 50 | 55 |
| Thickness(Tmax) | 18 | 18 | 18 |
| Pitch(F±15) | 22.5 | 22.5 | 22.5 |
| Lead length(L±2) | 30 | 30 | 30 |
| Lead width(W±0.2) | 10 | 10 | 10 |
| Lead thickness(H±0.1) | 1 | 1 | 1 |
| Width of lowlead(W1±0.2) | 6 | 6 | 6 |
Main Technical Parameters Of The Power Thermistor NTC Replacement MF73
Body diameter Φ40mm
| P/N | R25 ±20% (Ω) | Thermal sensitive index B±10% (K) | Max steady state current Imax (A) | Approx R of Max current Rmax (Ω) | Max power dissipation Pmax (W) | Thermal time constant (mW/C) | Thermal time constant (s) | Max impulse capacitance (uF) 240VAC |
| MF73-0.2/50 | 0.2 | 2600 | 50 | 0.007 | 25 | ≥55 | ≤350 | 8000 |
| MF73-0.5/40 | 0.5 | 2600 | 40 | 0.008 | 6800 | |||
| MF73-1/40 | 1 | 2600 | 40 | 0.010 | 6800 | |||
| MF73-1.5/36 | 1.5 | 2600 | 36 | 0.012 | 6800 | |||
| MF73-2/32 | 2 | 2600 | 32 | 0.014 | 6800 | |||
| MF73-2.5/30 | 2.5 | 2800 | 30 | 0.018 | 6800 | |||
| MF73-3/28 | 3 | 2800 | 28 | 0.02 | 6800 | |||
| MF73-4/27 | 4 | 2800 | 27 | 0.022 | 4700 | |||
| MF73-4.7/26 | 4.7 | 3000 | 26 | 0.023 | 4700 | |||
| MF73-5/25 | 5 | 3000 | 25 | 0.028 | 4700 | |||
| MF73-6.8/23 | 6.8 | 3000 | 23 | 0.03 | 4700 | |||
| MF73-8/20 | 8 | 3200 | 20 | 0.034 | 3300 | |||
| MF73-10/19 | 10 | 3200 | 19 | 0.038 | 3300 | |||
| MF73-12/18 | 12 | 3200 | 18 | 0.04 | 3300 | |||
| MF73-15/16 | 15 | 3200 | 16 | 0.05 | 3300 | |||
| MF73-18/14 | 18 | 3200 | 14 | 0.062 | 3300 | |||
| MF73-20/13 | 20 | 3200 | 13 | 0.075 | 3300 |
Body diameter Φ45mm
| P/N | R25 ±20% (Ω) | Thermal sensitive index B±10% (K) | Max steady state current Imax (A) | Approx R of Max current Rmax (Ω) | Max power dissipation Pmax (W) | Thermal time constant (mW/C) | Thermal time constant (s) | Max impulse capacitance (uF) 240VAC |
| MF73-0.2/65 | 0.2 | 2600 | 65 | 0.004 | 30 | ≥70 | ≤480 | 11500 |
| MF73-0.5/50 | 0.5 | 2600 | 50 | 0.007 | 8000 | |||
| MF73-1/48 | 1 | 2600 | 48 | 0.009 | 8000 | |||
| MF73-1.5/45 | 1.5 | 2600 | 45 | 0.011 | 8000 | |||
| MF73-2/40 | 2 | 2600 | 40 | 0.012 | 8000 | |||
| MF73-2.5/37 | 2.5 | 2600 | 37 | 0.015 | 8000 | |||
| MF73-3/35 | 3 | 2600 | 35 | 0.018 | 8000 | |||
| MF73-4/34 | 4 | 2600 | 34 | 0.020 | 6800 | |||
| MF73-4.7/32 | 4.7 | 2600 | 32 | 0.022 | 6800 | |||
| MF73-5/30 | 5 | 3000 | 30 | 0.025 | 6800 | |||
| MF73-6.8/28 | 6.8 | 3000 | 28 | 0.028 | 6800 | |||
| MF73-8/26 | 8 | 3200 | 26 | 0.03 | 4700 | |||
| MF73-10/24 | 10 | 3200 | 24 | 0.032 | 4700 | |||
| MF73-12/22 | 12 | 3200 | 22 | 0.034 | 4700 | |||
| MF73-15/20 | 15 | 3200 | 20 | 0.042 | 4700 | |||
| MF73-18/18 | 18 | 3200 | 18 | 0.061 | 4700 | |||
| MF73-20/16 | 20 | 3200 | 16 | 0.07 | 4700 |
Body diameter Φ50mm
| P/N | R25 ±20% (Ω) | Thermal sensitive index B±10% (K) | Max steady state current Imax (A) | Approx R of Max current Rmax (Ω) | Max power dissipation Pmax (W) | Thermal time constant (mW/C) | Thermal time constant (s) | Max impulse capacitance (uF) 240VAC |
| MF73-0.2/80 | 0.2 | 2600 | 80 | 0.003 | 36 | ≥90 | ≤650 | 15000 |
| MF73-0.5/60 | 0.5 | 2600 | 60 | 0.006 | 11500 | |||
| MF73-1/56 | 1 | 2600 | 56 | 0.008 | 11500 | |||
| MF73-1.5/50 | 1.5 | 2600 | 50 | 0.01 | 11500 | |||
| MF73-2/45 | 2 | 2600 | 45 | 0.012 | 11500 | |||
| MF73-2.5/42 | 2.5 | 2800 | 42 | 0.011 | 11500 | |||
| MF73-3/40 | 3 | 2800 | 40 | 0.015 | 11500 | |||
| MF73-4/38 | 4 | 2800 | 38 | 0.018 | 8000 | |||
| MF73-4.7/36 | 4.7 | 3000 | 36 | 0.021 | 9000 | |||
| MF73-5/35 | 5 | 3000 | 35 | 0.022 | 8000 | |||
| MF73-6.8/32 | 6.8 | 3000 | 32 | 0.025 | 8000 | |||
| MF73-8/29 | 8 | 3200 | 29 | 0.025 | 6800 | |||
| MF73-10/27 | 10 | 3200 | 27 | 0.03 | 6800 | |||
| MF73-12/25 | 12 | 3200 | 25 | 0.033 | 6800 | |||
| MF73-15/23 | 15 | 3200 | 25 | 0.04 | 6800 | |||
| MF73-18/20 | 18 | 3200 | 20 | 0.055 | 6800 | |||
| MF73-20/18 | 20 | 3200 | 18 | 0.065 | 6800 | |||
| MF73-25/15 | 25 | 3200 | 15 | 0.085 | 6800 |
Note: Unless the particular indication, allowable tolerance of R25 is ±20%.
Why need so big ntc thermistor ?
Inrush current is the momentary surge of current created when power is turned on to motors,transformers,power suppliers and heating elements. The more power required by industrial equipment,the larger the inrush current. It can effectively quench the inrush current by means of in series with power NTC thermistor in return circuit of power supply. The thermistor’s resistance decreases dramatically following the inrush,allowing the steady state curent to flow with very little resistance.This effect provides inrush current protection, yet allows efficiency during normal operation.The power NTC Thermistor produced by Dongguan Ampfort Electronics Co.,Ltd. with large scale,especially MF73T,MF73,MF74,MF75 serial products with big size,which can be applied in such inrush protection with industrial level as industrial robots and automation.
