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Inrush Current Limiting Power NTC Thermistors For Switch Mode Power Supply
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Brand Name:UCHI
Certification:UL.VDE.SGS.
Model Number:MF72
Price:Negotiable
Delivery Time:3~5 working days
Payment Terms:T/T,Paypal,Western Union,Money gram
Supply Ability:8000,000,000PCS Per Month
Company Data
Verified Supplier
Contact Person
Anna
Business Type:
Manufacturer Exporter
Officials:
Room 810, Unit 2, Building 5, Huixing Commercial Center, Dongsheng Road No.1, Zhongshan Dong, Shilong Town Dongguan, GUANGDONG, 523326 CN
Quality:
Quality Certifitation Available
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Product Details
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Product Details
Inrush Current Limiting Power NTC Thermistors For Switch Mode Power Supply
Quick Detail:
·Low cost solid state device for inrush current supression.
·Minimise line current distortion and radio noise.
·Protect switches, rectifier diodes and smoothing capacitors against premature failures.
·Prevent fuse from blowing in error.
Description:
Power NTC thermistor can be a cost effective device to limit the amount of inrush current in a switching power supply or other devices when the power is first turned on. Power NTC thermistor limits surge current by functioning as a power resistor which drops from a high cold resistance to a low hot resistance when heated by the current flowing through it.
Inrush-current limiters power NTC thermistor protect circuits from undesirably high currents, suppressing high inrush current surges, while its resistance remains negligible low during continuous operation. Thanks to their low resistance in the operating state, Power thermistor have a considerably lower power dissipation than the fixed resistors frequently used for this application.
Applications:
Limiting surge current, suitable for the protection of switch mode power supply, UPS power, transformers, motors, various electric heating utensil, energy saving lights, ballast, various power circuit, amplifiers, colored displayer, monitors, color TV, filament protection, etc.
Power thermistor components can also be used for the soft starting of motors, for example in vacuum cleaners with continuous currents of up to 20 A.
Specifications:
Inrush Current Limiting Power NTC Thermistor Features:
·Resin coated disk thermistor with uninsulated lead-wires.
·Suitable for both AC and DC circuits up to a voltage of 265 V(rms).
·Wide range of resistance, current and dimension.
·Excellent mechanical strength.
·Suitable for PCB mounting.
| Comparison curve with and without Inrush Current Limiting power NTC thermistor | Inrush Current Limiting Power NTC thermistor |
Typical Application of Inrush Current Limiting Power NTC thermistors for Circuit Protection
Basic circuit diagram NTC thermistor for diode protection
Possible locations of NTC Thermistors inrush current limiters
Typical power supply circuit
Power NTC thermistors application circuits
Another example NTC Thermistor for inrush current protection circuit
Inrush Current Limiting Power NTC Thermistors Dimensions (mm)
Inrush Current Limiting Power NTC Thermistors Data Sheet
| Part No. | R25 | Max | Approx. | Dissipation | Thermal | Dimensions (mm) | ||||
| Dmax | Tmax | H | H 0 | d±1 | ||||||
| MF72-3D9 | 3 ohm | 4A | 0.120 | 11 | 34 | 11 | 5.5 | 13.5 | 20.5 | 7.5 /5 |
| MF72-5D9 | 5 ohm | 3A | 0.210 | 11 | 34 | 11 | 5.5 | 13.5 | 20.5 | 7.5 /5 |
| MF72-8D9 | 8 ohm | 2A | 0.400 | 11 | 32 | 11 | 5.5 | 13.5 | 20.5 | 7.5 /5 |
| MF72-10D9 | 10 ohm | 2A | 0.458 | 11 | 32 | 11 | 5.5 | 13.5 | 20.5 | 7.5 /5 |
| MF72-16D9 | 16 ohm | 1A | 0.802 | 11 | 31 | 11 | 5.5 | 13.5 | 20.5 | 7.5 /5 |
| MF72-22D9 | 22 ohm | 1A | 0.950 | 11 | 30 | 11 | 5.5 | 13.5 | 20.5 | 7.5 /5 |
| MF72-33D9 | 33 ohm | 1A | 1.124 | 11 | 30 | 11 | 5.5 | 13.5 | 20.5 | 7.5 /5 |
| MF72-50D9 | 50 ohm | 1A | 1.252 | 11 | 30 | 11 | 5.5 | 13.5 | 20.5 | 7.5 /5 |
| MF72-80D9 | 80 ohm | 0.8A | 2.010 | 11 | 30 | 11 | 5.5 | 13.5 | 20.5 | 7.5 /5 |
| MF72-3D11 | 3 ohm | 5A | 0.100 | 13 | 43 | 13 | 5.5 | 15.5 | 22.5 | 7.5 /5 |
| MF72-5D11 | 5 ohm | 4A | 0.156 | 13 | 45 | 13 | 5.5 | 15.5 | 22.5 | 7.5 /5 |
| MF72-8D11 | 8 ohm | 3A | 0.255 | 14 | 47 | 13 | 5.5 | 15.5 | 22.5 | 7.5 /5 |
| MF72-10D11 | 10 ohm | 3A | 0.275 | 14 | 47 | 13 | 5.5 | 15.5 | 22.5 | 7.5 /5 |
| MF72-12D11 | 12 ohm | 2A | 0.462 | 14 | 48 | 13 | 5.5 | 15.5 | 22.5 | 7.5 /5 |
| MF72-16D11 | 16 ohm | 2A | 0.470 | 14 | 50 | 13 | 5.5 | 15.5 | 22.5 | 7.5 /5 |
| MF72-20D11 | 20 ohm | 2A | 0.512 | 15 | 52 | 13 | 5.5 | 15.5 | 22.5 | 7.5 /5 |
| MF72-22D11 | 22 ohm | 2A | 0.563 | 15 | 52 | 13 | 5.5 | 15.5 | 22.5 | 7.5 /5 |
| MF72-33D11 | 33 ohm | 1.5A | 0.734 | 15 | 52 | 13 | 5.5 | 15.5 | 22.5 | 7.5 /5 |
| MF72-50D11 | 50 ohm | 1.5A | 1.021 | 15 | 52 | 13 | 5.5 | 15.5 | 22.5 | 7.5 /5 |
| MF72-60D11 | 60 ohm | 1.5A | 1.215 | 15 | 52 | 13 | 5.5 | 15.5 | 22.5 | 7.5 /5 |
| MF72-1.3D13 | 1.3 ohm | 7A | 0.062 | 13 | 60 | 15.5 | 6 | 17.5 | 24.5 | 7.5 |
| MF72-3D13 | 3 ohm | 6A | 0.092 | 14 | 60 | 15.5 | 6 | 17.5 | 24.5 | 7.5 |
| MF72-5D13 | 5 ohm | 5A | 0.125 | 15 | 68 | 15.5 | 6 | 17.5 | 24.5 | 7.5 |
| MF72-10D13 | 10 ohm | 4A | 0.206 | 15 | 65 | 15.5 | 6 | 17.5 | 24.5 | 7.5 |
| MF72-15D13 | 15 ohm | 3A | 0.335 | 16 | 60 | 15.5 | 6 | 17.5 | 24.5 | 7.5 |
| MF72-30D13 | 30 ohm | 2.5A | 0.517 | 16 | 65 | 15.5 | 6 | 17.5 | 24.5 | 7.5 |
| MF72-47D13 | 47 ohm | 2A | 0.810 | 17 | 65 | 15.5 | 6 | 17.5 | 24.5 | 7.5 |
| MF72-1.3D15 | 1.3 ohm | 8A | 0.048 | 18 | 68 | 17.5 | 6 | 19.5 | 26.5 | 10/7.5 |
| MF72-1.5D15 | 1.5 ohm | 8A | 0.052 | 18 | 69 | 17.5 | 6 | 19.5 | 26.5 | 10/7.5 |
| MF72-3D15 | 3 ohm | 7A | 0.075 | 18 | 76 | 17.5 | 6 | 19.5 | 26.5 | 10/7.5 |
| MF72-5D15 | 5 ohm | 6A | 0.112 | 20 | 76 | 17.5 | 6 | 19.5 | 26.5 | 10/7.5 |
| MF72-8D15 | 8 ohm | 5A | 0.178 | 20 | 80 | 17.5 | 6 | 19.5 | 26.5 | 10/7.5 |
| MF72-10D15 | 10 ohm | 5A | 0.180 | 21 | 85 | 17.5 | 6 | 19.5 | 26.5 | 10/7.5 |
| MF72-15D15 | 15 ohm | 4A | 0.268 | 20 | 75 | 17.5 | 6 | 19.5 | 26.5 | 10/7.5 |
| MF72-30D15 | 30 ohm | 3.5A | 0.438 | 18 | 75 | 17.5 | 6 | 19.5 | 26.5 | 10/7.5 |
| MF72-47D15 | 47 ohm | 3A | 0.680 | 21 | 86 | 17.5 | 6 | 19.5 | 26.5 | 10/7.5 |
| MF72-0.7D20 | 0.7 ohm | 12A | 0.018 | 25 | 89 | 22.5 | 7 | 24.5 | 31.5 | 10/7.5 |
| MF72-1.3D20 | 1.3 ohm | 9A | 0.037 | 24 | 88 | 22.5 | 7 | 24.5 | 31.5 | 10/7.5 |
| MF72-3D20 | 3 ohm | 8A | 0.055 | 24 | 88 | 22.5 | 7 | 24.5 | 31.5 | 10/7.5 |
| MF72-5D20 | 5 ohm | 7A | 0.087 | 23 | 87 | 22.5 | 7 | 24.5 | 31.5 | 10/7.5 |
| MF72-8D20 | 8 ohm | 6A | 0.142 | 25 | 105 | 22.5 | 7 | 24.5 | 31.5 | 10/7.5 |
| MF72-10D20 | 10 ohm | 6A | 0.162 | 24 | 102 | 22.5 | 7 | 24.5 | 31.5 | 10/7.5 |
newly developed inrush current limiting power NTC thermistor increased max. operating current.
| Part No. | R25 (ohm) | Max Stable Current (A) | Approx. Resistance Value at Maximum Current (Ω) | Max Rated Power Pmax. (W) | Dissipation Factor (mW/oC) | Thermal Time Constant (s) | Dimensions (mm) | |||||
| Dmax | Tmax | H | H 0 | d | Pin form | |||||||
| D15mm 2.5ohm/9.5A | 2.5 ohm | 9.5A | 0.044 | 3.5W | 22 min | 75 max | 17.5 | 6 | 19.5 | 26.5 | 7.5 | inner kinked |
| D15mm 5 ohm/8A | 5 ohm | 8A | 0.058 | 3.5W | 22 min | 75 max | 17.5 | 6 | 19.5 | 26.5 | 7.5 | inner kinked |
| D15mm, 10 ohm/7A | 10 ohm | 7A | 0.098 | 3.5W | 22 min | 75 max | 17.5 | 6 | 19.5 | 26.5 | 7.5 | inner kinked |
| D20mm 1 ohm/16A | 1 ohm | 16A | 0.027 | 5W | 28 min | 110 max | 22.5 | 7 | 24.7 | / | 10 | straight |
| D20mm 5 ohm/12A | 5 ohm | 12A | 0.047 | 5W | 28 min | 110 max | 22.5 | 7 | 24.7 | / | 10 | straight |
| D20mm, 10 ohm/8A | 10 ohm | 8A | 0.085 | 5W | 28 min | 110 max | 22.5 | 7 | 24.7 | / | 10 | straight |
| D25mm, 1 ohm/20A | 1 ohm | 20A | 0.021 | 7W | 30 min | 130 max | 29 | 8 | 33 | / | 10 | straight |
| D25mm , 5 ohm/14A | 5 ohm | 14A | 0.047 | 7W | 30 min | 130 max | 29 | 8 | 33 | / | 10 | straight |
| D25mm, 10 ohm/10A | 10 ohm | 10A | 0.084 | 7W | 30 min | 130 max | 29 | 8 | 33 | / | 10 | straight |
| D30mm, 1 ohm/30A | 1ohm | 30A | 0.014 | 8W | 40 min | 190 max | 36 | 8.5 | 40 | / | 18 | straight |
| D30mm, 10 ohm/13A | 10 ohm | 13A | 0.056 | 8W | 40 min | 190 max | 36 | 8.5 | 40 | / | 18 | straight |
Inrush Current Limiting Power NTC thermistor Reliability Data
| Test | Standard | Test Conditions | ΔR25/R25 (typical) | Remarks |
| Storage in dry heat | IEC 6 | Storage at upper category temperature Temperature: 125oC Time: 1000h | <10% | No visible damage |
| Storage in damp heat, steady state | IEC 6 | Temperature of air: 40oC Relative humidity of air: 93% Duration: 21 days | <5% | No visible damage |
| Rapid temperature cycling | IEC 6 | Lower test temperature: -55oC Upper test temperature: 125oC Number of cycles: 10 | <10% | No visible damage |
| Endurance |
| I=Imax t: 1000h | <10% | No visible damage |
| Cyclic endurance |
| I=Imax, 1000 cycles On-time=1 min Cooling time=6 min | <10% |
|
| Transient load |
| Capacitance=CT Number of cycles: 1000 | <5% | No visible damage |
Reference information for selecting inrush current limiting power NTC thermistor
1) Maximum operating current > Actual operating current in the power loop
2) Rated zero power resistance at 25C
<img data-cke-saved-src="http://www.amwei.com/pima/Resistance%20calculation.gif" src="http://www.amwei.com/pima/Resistance%20calculation.gif" "alt="Resistance calculation">
of which, E: loop voltage, Im: Surge current
For conversion power, reversion power, switch power, UPS power, Im=100 times operating current
For filament, heater, Im =30 times operating current
3) The larger Beta value, the smaller residual resistance, the smaller operating temperature rising.
4) Generally, the larger product of time constant and dissipation coefficient, the larger NTC thermal capacity, the more powerful NTC thermistor surge current restraining capacity.
Inrush Current Limiting Power NTC Thermistor Application Precautions
1) For inrush current limiting, the NTC thermistor must be connected in series with the load circuit. Several inrush current limiters can also be connected in series for higher damping. Inrush current limiters must not be connected in parallel.
2) In general inrush current limiters require time to get back to cold state, in which they can provide adequate inrush current limiting due to their high resistance. The cooling down time depends on ambient conditions.
3) It should be considered that the surrounding area of NTC Thermistor may become quite hot.Ensure the adjacent components are placed at sufficient distance from a thermistor to allow for proper cooling time of the thermistor.
4) Make sure that adjacent materials are designed for operation at temperatures comparable to the surface temperature of the thermistor. Make sure that surrounding parts and materials can withstand this temperature.
5) Make sure that thermistors are adequately ventilated to avoid overheating.
6) Avoid comtamination of the thermistor surface.
7) Avoid contact of NTC thermistors with any liquids and solvents. Ensure that no water enters an NTC thermistor.
Competitive Advantage:
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Factory supply directly
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Completed certificates such as UL,VDE,SGS,etc and high quality available
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Quick delivery
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Best after-sales services
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OEM & ODM available
Company Profile
Guangdong Uchi Electronics Co.,Ltd
Uchi was established in 2006 in Dongguan, China.
After years of development, Uchi has become a large scale hi-tech
enterprise that specialized in development and production of
complete series of MOV,PTC, NTC series, PPTC series, Fuse(ALL
TYPE),Resistor、integrated circuit 、 Capacitor, surge protector and
protective devices of lightning protection products. It ranks front
in the industry and has heartquarter in Hong Kong. With its
excellent technology and quality products, Uchi has won wide
recognition of overseas customers. Saini Impex PVT.LTD is our
authorized sole distributor in india .
China's leading enterprise of circuit protection components
Our strength ：
A large number of product series in our factory have passed the
certification of various international standards
Factory Tour ：
Advanced equipment, lean production
Uchi boasts with a production base that covers an area of nearly
15000 square meters.
We successively imported high-tech fully automated production
equipments and high precision testing instruments and have put into
production to realize the automation, large scale and
standardization.
Uchi has a galaxy of hi-tech talent teams headed up by national
class experts to engage in the work of product development, product
quality control, sales andservice technical support, etc., and has
successively obtained tens of certificates of appearance patents,
utility patents and inventions.
To guarantee the quality, we successfully passed the certification
of ISO9001:2008 quality management system, scientific and efficient
managing mode to carry out lean production and form scientific and
efficient quality control system. The products are certified with
UL, CUL, TUV, VDE, CSA and SGS, RACH 73 environmentally friendly
testing certifications.
Exquisite quality at customers' favor
Uchi is an export membership of Alibaba with free import and export rights. It is appraised as Guangdong Famous Star Enterprise and Dongguan Private Enterprise. Our products have doubled and redoubled to provide more kinds and high quality and reliable products and service. Our products mainly consist of:
Metal Oxide Varistor
DIP Varistor & SMD Varistor
Thermally Protected Varistor
DC-Link Capacitor for New energy vehicles supporting the HEVEV
Automotive Fuse Links for EV Plugin HEV FCEV
PTC Thermistor
NTC Thermistor
PPTC Resettable Fuse
Thermal Fuse
Auto Blade Fuse
Glass Fuses
Metal Film Resistor
Carbon Film Resistor
Cement Resistor
NTC Temperature Sensor
CDS Photoconductive Cell
Our products are widely used in New energy vehicles, home appliance, medical equipment, office equipment, communication
equipment, phone battery, electronic calendar, electronic
thermometer and temperature controller to cover military
telecommunications, IT, automobile and consumer electronic fields.
Cooperation with good faiths to win in the market.
Excellent quality sincere service is the key to the success of
Uchi.
In the future Uchi will still stick to the tenets of "Quality
first, customer foremost." "First class quality, first class
service and customersatisfaction" to manufacture the high quality,
technically advanced and reasonable prices products. We hope to
trigger with global partners the revolution in resistor products.
We cordially welcome friends from home and abroad to visit us for
guidance and cooperation.
Send your message to this supplier
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