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MF73T NTC Thermistor For Limiting Inrush Current Of High Power Switch Power
Advantage of apply MF73T NTC THERMISTOR
Best choice for limiting inrush current
Leading Technology Perfect Function Originate in domestic
Max steady state current : 120A
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 Guangdong Uchi Technology 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.
Characteristics
Small size,strong power and strong capability of surge current protection
Big material constat(B value),small remain resistance,low power consumption.
Large steady state current,long life,high reliability
Easy PCB installation,completed series,wide application range.
Recommended Application
High power switch power,Power conversion,UPS power
High power battery charger,electric vehicle battery charger
High power LED light,high power electronic energy saving lamps and other lighting lamps
Outline Dimension
| Body size | Φ3 | Φ5 | Φ8 | Φ10 | Φ13 | Φ15 | Φ20 | Φ25 | Φ30 | Φ35 | Φ40 |
| Dmax)/Diameter | 4.5 | 7 | 11 | 13 | 15.5 | 17.5 | 22.5 | 29 | 35 | 40 | 45 |
| Tmax)/Thickness | 4.5 | 5 | 5.5 | 6 | 6 | 6 | 7 | 8 | 10 | 12 | 12 |
| F)/Pitch | 2.5±1 | 2.5±1 | 7.5±1 | 7.5±1 | 7.5±1 | 7.5±1 | 10.0±1 | 10.0±1 | 18±1.5 | 18±1.5 | 18±1.5 |
| d±0.05)/Lead diameter | 0.45 | 0.45 | 0.8 | 0.8 | 0.8 | 0.8 | 1.0 | 1.0 | 1.6 | 2.0 | 2.0/2.6 |
| L)/Lead length | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| L1)/Lead length | / | / | 17 | 17 | 17 | 17 | 17 | 17 | / | / | / |
| Normal lead structure | Straight (Ⅱ) | Straight (Ⅱ) | Inside kink (Ⅰ) | Inside kink (Ⅰ) | Inside kink(Ⅰ) | Inside kink (Ⅰ) | Straight (Ⅱ) | Straight (Ⅱ) | Straight (Ⅱ) | Straight (Ⅱ) | Straight (Ⅱ) |
| Abnormal lead structure | / | / | Straight (Ⅱ) | Straight (Ⅱ) | Straight(Ⅱ) | Straight (Ⅱ) | Outside kink (Ⅲ) | Outside kink(Ⅲ) |
| Body size | Φ20 | Φ25 | Φ30 | Φ35 | Φ40 |
| Dmax Diameter | 22.5 | 29 | 35 | 40 | 45 |
| Tmax Thickness | 10 | 12 | 15 | 18 | 18 |
| F/Pitch | 10.0 | 10.0 | 18 | 18 | 18 |
| d±0.05 Lead diameter | 1.2 | 1.2 | 1.6 | 2 | 2.0/2.6 |
| L/Lead length min | 17 | 17 | 17 | 17 | 17 |
| Height (A) max | 38 | 40 | 55 | 58 | 60 |
| Normal lead structure | Y Kink | ||||
Note: 2.6mm lead would be applied when Imax is above 32A for D40
Specificational Parameter
Body diameter Φ3mm
| 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 |
| MF73T-1 5/2 | 5 | 2500 | 2 | 0.493 | 1.5 | ≥8 | ≤15 | 100 |
| MF73T-1 10/1 | 10 | 2600 | 1 | 1.223 | 100 | |||
| MF73T-1 20/0.7 | 20 | 2600 | 0.7 | 3.011 | 100 |
Body diameter Φ5mm
| 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 |
| MF73T-1 1/3.5 | 1 | 2500 | 3.5 | 0.92 | 1.8 | ≥9 | ≤25 | 110 |
| MF73T-1 10/2 | 10 | 2600 | 2 | 0.542 | 110 | |||
| MF73T-1 20/1 | 20 | 2600 | 1 | 1.544 | 110 | |||
| MF73T-1 30/1 | 30 | 2600 | 1 | 1.715 | 68 |
Body diameter Φ8mm
| 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 |
| MF73T-1 0.7/7 | 0.7 | 2500 | 7 | 0.032 | 2.3 | ≥10 | ≤42 | 220 |
| MF73T-1 10/2 | 1 | 2600 | 6 | 0.04 | 220 | |||
| MF73T-1 20/1 | 8 | 2600 | 3 | 0.278 | 220 | |||
| MF73T-1 30/1 | 10 | 2600 | 3 | 0.297 | 220 |
Body diameter Φ10mm
| 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 |
| MF73T-1 0.7/8 | 0.7 | 2600 | 8 | 0.041 | 2.5 | ≥12 | ≤50 | 470 |
| MF73T-1 5/5 | 5 | 2800 | 5 | 0.1 | 470 | |||
| MF73T-1 10/4 | 10 | 2800 | 4 | 0.175 | 470 | |||
| MF73T-1 30/1 | 20 | 3000 | 3 | 0.27 | 330 |
Body diameter Φ13mm
| 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 |
| MF73T-1 1/9 | 1 | 2600 | 9 | 0.032 | 3.2 | ≥13 | ≤65 | 680 |
| MF73T-1 3/8 | 3 | 2600 | 8 | 0.052 | 680 | |||
| MF73T-1 10/6 | 10 | 3000 | 6 | 0.126 | 560 | |||
| MF73T-1 20/4 | 20 | 3200 | 4 | 0.192 | 560 |
Body diameter Φ15mm
| 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 |
| MF73T-1 0.7/11 | 0.7 | 2600 | 11 | 0.024 | 3.6 | ≥22 | ≤75 | 1000 |
| MF73T-1 1.5/10 | 1.5 | 2600 | 10 | 0.036 | 820 | |||
| MF73T-1 3/9 | 3 | 2800 | 9 | 0.046 | 820 | |||
| MF73T-1 10/7 | 10 | 3200 | 7 | 0.098 | 680 |
Body diameter Φ20mm
| 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 |
| MF73T-1 0.7/16 | 0.7 | 2600 | 16 | 0.026 | 5 | ≥28 | ≤110 | 1500 |
| MF73T-2 0.7/16 | 0.7 | 2600 | 16 | 0.026 | 3000 | |||
| MF73T-1 2/14 | 2 | 2600 | 14 | 0.035 | 1500 | |||
| MF73T-2 2/14 | 2 | 2600 | 14 | 0.035 | 3000 | |||
| MF73T-1 10/8 | 10 | 3000 | 8 | 0.085 | 1000 | |||
| MF73T-2 10/8 | 10 | 3000 | 8 | 0.085 | 1500 |
Body diameter Φ25mm
| 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 |
| MF73T-1 0.5/22 | 0.5 | 2600 | 22 | 0.017 | 7 | ≥30 | ≤130 | 2200 |
| MF73T-2 0.5/22 | 0.5 | 2600 | 22 | 0.017 | 3500 | |||
| MF73T-1 2/18 | 2 | 2600 | 18 | 0.026 | 2200 | |||
| MF73T-2 2/18 | 2 | 2600 | 18 | 0.026 | 3500 | |||
| MF73T-1 10/10 | 10 | 3200 | 10 | 0.084 | 1200 |
Body diameter Φ30mm
| 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 |
| MF73T-1 0.5/30 | 0.5 | 2600 | 30 | 0.013 | 8 | ≥40 | ≤190 | 3000 |
| MF73T-2 0.5/30 | 0.5 | 2600 | 30 | 0.013 | 4700 | |||
| MF73T-1 4/19 | 4 | 2800 | 19 | 0.031 | 2200 | |||
| MF73T-2 4/19 | 4 | 2800 | 19 | 0.031 | 4700 | |||
| MF73T-1 10/13 | 10 | 3200 | 13 | 0.056 | 1500 | |||
| MF73T-2 10/13 | 10 | 3200 | 13 | 0.056 | 3300 | |||
| MF73T-1 20/9 | 20 | 3200 | 9 | 0.113 | 1500 |
Body diameter Φ35mm
| 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 |
| MF73T-1 1/32 | 1 | 2600 | 32 | 0.013 | 9 | ≥45 | ≤280 | 3300 |
| MF73T-2 1/32 | 1 | 2600 | 32 | 0.013 | 4700 | |||
| MF73T-1 4/21 | 4 | 2800 | 21 | 0.031 | 3000 | |||
| MF73T-2 4/21 | 4 | 2800 | 21 | 0.031 | 4700 | |||
| MF73T-1 5/19 | 5 | 3000 | 19 | 0.056 | 3000 | |||
| MF73T-1 10/15 | 10 | 3200 | 15 | 0.056 | 2200 | |||
| MF73T-2 10/15 | 10 | 3200 | 15 | 0.113 | 3300 |
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 |
| MF73T-1 0.2/40 | 0.2 | 2600 | 40 | 0.005 | 12 | ≥55 | ≤450 | 4700 |
| MF73T-2 0.2/40 | 0.2 | 2600 | 40 | 0.005 | 8000 | |||
| MF73T-1 1/40 | 1 | 2600 | 40 | 0.01 | 4700 | |||
| MF73T-2 1/40 | 1 | 2600 | 40 | 0.01 | 6800 | |||
| MF73T-1 5/25 | 5 | 3000 | 25 | 0.028 | 3300 | |||
| MF73T-2 5/25 | 5 | 3000 | 25 | 0.028 | 4700 | |||
| MF73T-1 10/19 | 10 | 3200 | 19 | 0.038 | 3000 | |||
| MF73T-2 10/19 | 10 | 3200 | 19 | 0.038 | 4700 | |||
| MF73T-1 20/13 | 20 | 3200 | 13 | 0.075 | 3000 |
