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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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MF75 Super Power NTC Thermistor For Audio Power Amplifier Inrush Current Protection
I Description Of The MF75 Super Power 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.
II Application Of The MF75 Super Power NTC Thermistor
> Nuclear magnetic resonance equipment
> Super power audio power amplifier
> High power circle transformer
> The solar panel arrays with high capacity power inverter
> The industrial robot drived by high voltage power supply
III Dimension Of The MF75 Super Power NTC Thermistor
| Body size | Φ40 | Φ45 | Φ50 |
| (Dmax)/Diameter | 98 | 92 | 92 |
| (Tmax)/Thickness | 46 | 46 | 46 |
| (F±1.5)/Pitch | 30 | 30 | 30 |
| (L±2)/Lead length | 40 | 40 | 40 |
| Lead Height(Ho max) | 110 | 110 | 110 |
| Lead width(W±0.2) | 12.0 | 12.0 | 12.0 |
| Lead thickness(H±0.1) | 1.2 | 1.2 | 1.2 |
| Body size | Φ40 | Φ45 | Φ50 |
| (Dmax)/Diameter | 92 | 92 | 92 |
| (Tmax)/Thickness | 46 | 46 | 46 |
| (F±1.5)/Pitch | 30 | 30 | 30 |
| (L±2)/Lead length | 40 | 40 | 40 |
| Lead Height(Ho max) | 110 | 110 | 110 |
| Lead width(W±0.2) | 12 | 12 | 12 |
| Lead thickness(H±0.1) | 1.2 | 1.2 | 1.2 |
| Width of lower lead (W1±0.2) | 8 | 8 | 8 |
IV Specification Of The MF75 Super Power NTC Thermistor
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) | Dissipation factor(mW/C) | Thermal time constant (s) | Max impulse capacitance (uF)240VAC |
| MF75-0.2/55 | 0.2 | 2600 | 55 | 0.007 | 30 | ≥55 | ≤350 | 8000 |
| MF75-1/45 | 1 | 2600 | 45 | 0.01 | 6800 | |||
| MF75-2/35 | 2 | 2600 | 35 | 0.014 | 6800 | |||
| MF75-5/27 | 5 | 3000 | 27 | 0.028 | 4700 | |||
| MF75-8/22 | 8 | 3200 | 22 | 0.034 | 3300 | |||
| MF75-10/21 | 10 | 3200 | 21 | 0.038 | 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) | Dissipation factor(mW/C) | Thermal time constant (s) | Max impulse capacitance (uF)240VAC |
| MF75-0.2/70 | 0.2 | 2600 | 70 | 0.006 | 45 | ≥70 | ≤480 | 11500 |
| MF75-0.5/55 | 0.5 | 2600 | 55 | 0.007 | 8000 | |||
| MF75-1/52 | 1 | 2600 | 52 | 0.009 | 8000 | |||
| MF75-2/45 | 2 | 2600 | 45 | 0.012 | 8000 | |||
| MF75-5/35 | 5 | 3000 | 35 | 0.025 | 6800 | |||
| MF75-10/28 | 10 | 3200 | 28 | 0.032 | 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) | Dissipation factor(mW/C) | Thermal time constant (s) | Max impulse capacitance (uF)240VAC |
| MF75-0.2/90 | 0.2 | 2600 | 90 | 0.004 | 55 | ≥90 | ≤650 | 15000 |
| MF75-1/60 | 1 | 2600 | 60 | 0.008 | 11500 | |||
| MF75-2/50 | 2 | 2600 | 50 | 0.011 | 11500 | |||
| MF75-5/40 | 5 | 3000 | 40 | 0.022 | 8000 | |||
| MF75-8/32 | 8 | 3200 | 32 | 0.028 | 6800 | |||
| MF75-10/30 | 10 | 3200 | 30 | 0.03 | 6800 |
V Characteristics Of The MF75 Super Power NTC Thermistor
• 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
VI Ampfort Advantage Of The MF75 Super Power NTC Thermistor
* Product R&D and production Base
* Only direct factory marketing windows
* On behalf of buy ,inspection ,delivery , payment
* Low cost shippment advisor
* Provide technical supoort & advices freely for whole course
VII About AMPFORT Of The MF75 Super Power NTC Thermistor
Ampfort Electronics, National Hi-Tech Enterprise and drafting member of “National Thirteen Five Plan”,specilized in manufacturing sensitive elements as NTC/PTC thermistor,NTC temperature sensor and metal oxide varistor. With unique process and advanced technology , product produced with high precision,high reliability,high stability etc outstanding advantages, becoming leading level in the industry. Based on current standard power type MF72 NTC thermistors and “The engineer and research technology center of NTC thermistor ceramic material ” ,applied with new materials/technology/process/equipment,as well as unremitting efforts, innovated MF73T,MT73,MF74,MF75 etc. new power type NTC thermistor and mass production to be realized,key technology has been got big breakthrough and performances has been increased a lot.We have our own proprietary intellectual property right and dozens of patents, it can provide inrush protection in industrial level application and it is originate in domestic !
A glance at workshop and
R&D center
16 years’ experience R&D center and modern
factories cover an areas of 120 mu .
