PTC And NTC Thermistor 2.5D-5 2.5R 5mm Manufactured By Dongguan Ampfort

PTC And NTC Thermistor 2.5D-5 2.5R 5mm Manufactured By Dongguan Ampfort

Product Details:

Place of Origin: DONGGUAN,GUANGDONG,CHINA
Brand Name: AMPFORT
Certification: ROHS
Model Number: 2.5D-5

Payment & Shipping Terms:

Minimum Order Quantity: 10000PCS
Price: 0.02~0.03USD/PC
Packaging Details: Bulk,1K PER BAG
Delivery Time: 10 workdays
Payment Terms: T/T IN ADVANCE
Supply Ability: 100KKPCS Per month
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Detail Information

Name: NTC Thermistor 2.5D-5 Chip Diameter: 5mm
R25: 2.5 Ohm Color: Black
Resin: PF Lead: CP
Highlight:

2.5 Ohm PTC NTC Thermistor

,

5mm Chip PTC NTC Thermistor

,

PTC Power NTC Thermistor

Product Description

 

PTC And NTC Thermistor 2.5D-5 2.5R 5mm Manufactured By Dongguan Ampfort  In China

 

What do the letters and numbers of NTC, MF72, etc. in NTC thermistor MF72-2.5D-5 mean?

 

(1) NTC refers to negative temperature coefficient thermistor

(2) M means sensitive element

(3) F means negative temperature coefficient

(4) 7 means power type

(5) 2 is the sequence number

(6) 2.5 means the resistance value at 25°C is 2.5 ohms

(7) D5 means the chip diameter is 5mm

PTC And NTC Thermistor 2.5D-5 2.5R 5mm Manufactured By Dongguan Ampfort 0

 

 

What is the difference between PTC and NTC thermistor?


They are available with either a negative temperature coefficient, (NTC) of resistance or a positive temperature coefficient (PTC) of resistance. The difference being that NTC thermistors reduce their resistance as the temperature increases, while PTC thermistors increase their resistance as the temperature increases.

 

 

Application Of The PTC And NTC Thermistor

 

Suitable for switching power supply, switching power supply, UPS power supply, various electric heaters, electronic energy-saving lamps, electronic ballasts, protection of power supply circuits of various electronic devices, and filament protection of color display tubes, incandescent lamps and other lighting fixtures

1.Power products: switch mode power supply,UPS power

2.Lighting products: incandescent lights,energy saving lights,LED lights.

3.Equipment products: industry equipment,communication equipment,electrical equipment,medical equipment

4.Home appliance: air conditioner,refrigerator,TV,washing machine

5.Instrumental products.

 

 

Selection Guide Of The PTC And NTC Thermistor

 

1. Max operating current of ntc thermistor Imax > actual operating current in power circuit.

2. Rated resistance of ntc thermistor R25≥(root of 2)xE/Im

E: Line voltage  Im: Max inrush current current in circuit

3. B value is bigger, residual resistance is smaller, temperature rising is smaller when operating.

 

 

Features Of The PTC And NTC Thermistor

 

1. Comply with ROHS complaint

2. Small size,big power,strong inrush current limiting ability

3. Fast response

4. Big B value,low residual resistance

5. Long life and high reliability

6. Completed series,wide operating range

7. Low cost and good stability

 

 

Main Parameters Of The PTC And NTC Thermistor

 

PTC And NTC Thermistor 2.5D-5 2.5R 5mm Manufactured By Dongguan Ampfort 1

P/N D T F L
Tin-plated copper wire Tin-plated steel wire Normal Cutting
MF72 2.5D-5 ≤7 ≤4.5 0.55±0.06 0.5±0.06 5.0±1.0 ≥25 Customization

 

P/N

Rated zero power resistance

@25C(Ohm)

Max stable current

@25C(A)

Residual resistance

at max current

@25C(A)

B25/85(K) Thermal time constant(s) Dissipation factor(mw/C) Certification Operating temperature
MF72 2.5D-5 2.5 0.7 0.4 2700 ≤18 ≥6 -40~150 UL 

 

 

Series Parameters Of The PTC And NTC Thermistor

 

P/N

Rated zero power resistance

@25C(Ohm)

Max stable current

@25C(A)

Residual resistance

at max current

@25C(A)

B25/85(K) Thermal time constant(s) Dissipation factor(mw/C) Certification Operating temperature
5D-5 5 1 0.584 2700 ≤18 ≥6 -40~150 CQC UL CUL TUV
6D-5 6 0.7 0.675 2700 ≥6 -40~150 TUV
7D-5 7 0.7 0.766 2700 ≥6 -40~150 TUV
8D-5 5 0.7 0.857 2700 ≥6 -40~150 TUV
10D-5 10 0.7 1.039 2700 ≥6 -40~150 CQC UL CUL TUV
12D-5 12 0.6 1.235 2800 ≥6 -40~150 TUV
15D-5 15 0.6 1.530 2800 ≥6 -40~150 CQC UL CUL TUV
16D-5 16 0.6 1.628 2800 ≥6 -40~150 TUV
18D-5 18 0.6 1.824 2800 ≥6 -40~150 TUV
20D-5 20 0.6 2.020 2800 ≥6 -40~150 CQC UL CUL TUV
22D-5 22 0.6 2.060 2800 ≥6 -40~150 CQC UL CUL TUV
25D-5 25 0.5 2.123 2800 ≥6 -40~150 TUV
30D-5 30 0.5 2.227 2800 ≥6 -40~150 CQC UL CUL TUV
33D-5 33 0.5 2.436 2800 ≥6 -40~150 CQC UL CUL TUV
50D-5 50 0.4 2.653 3000 ≥6 -40~150 CQC UL CUL TUV
60D-5 60 0.3 2.753 3000 ≥6 -40~150 CQC UL CUL TUV
200D-5 200 0.1 18.7 3000 ≥6 -40~150 UL

PTC And NTC Thermistor 2.5D-5 2.5R 5mm Manufactured By Dongguan Ampfort 2

PTC And NTC Thermistor 2.5D-5 2.5R 5mm Manufactured By Dongguan Ampfort 3

PTC And NTC Thermistor 2.5D-5 2.5R 5mm Manufactured By Dongguan Ampfort 4

PTC And NTC Thermistor 2.5D-5 2.5R 5mm Manufactured By Dongguan Ampfort 5

 

 

Why can't products using NTC thermistors switch frequently? The following is their brief analysis and improvement.

 

a.Briefly analyze

 

We can see from the analysis of the working principle of the circuit that there are products that use NTC thermistors. Under normal working conditions, a certain current flows through the NTC thermistor, and this working current is enough to make the surface temperature of the NTC reach 100 ℃~200℃. When the product is turned off, the NTC thermistor must fully recover from the high temperature and low resistance state to the normal temperature and high resistance state in order to achieve the same surge suppression effect as the last time. This recovery time is related to the dissipation coefficient and heat capacity of the NTC thermistor, and the cooling time constant is generally used as a reference in engineering. The so-called cooling time constant refers to the time (in seconds) required for the NTC thermistor to cool down to 63.2% of its temperature rise after self-heating in a specified medium. The cooling time constant is not the time required for the NTC thermistor to return to normal, but the larger the cooling time constant, the longer the required recovery time, and vice versa.

 

b.how to improve

 

Under the guidance of the above ideas, at the moment when the product is powered on, the NTC thermistor suppresses the inrush current to an appropriate level, and then the product is powered on and works normally. Resistors are cut from the working circuit. In this way, the NTC thermistor only works when the product is started, and is not connected to the circuit when the product is working normally. This not only prolongs the service life of the NTC thermistor, but also ensures that it has sufficient cooling time, which can be suitable for applications requiring frequent switching.

 

It can be seen from the above analysis that for applications that require frequent switching, a relay bypass circuit must be added to the circuit to ensure that the NTC thermistor can be completely cooled and returned to the resistance in the initial state. In product selection, the product series should be selected according to the maximum rated voltage and filter capacitance value, and the resistance value of the NTC thermistor should be selected according to the maximum starting current value allowed by the product and the working current loaded on the NTC thermistor for a long time. At the same time, the temperature of the working environment should be considered, and the derating design should be appropriately carried out.

 

c. in conclusion

 

It can be seen from the above analysis that the NTC thermistor type surge suppressor used in the power supply design has the same ability to suppress the surge current as the ordinary resistor, and the power consumption on the resistor can be reduced by tens to hundreds of times. For applications that require frequent switching, a relay bypass circuit must be added to the circuit to ensure that the NTC thermistor can completely cool down and return to its initial state of resistance. In product selection, the product series should be selected according to the maximum rated voltage and filter capacitance value, and the resistance value of the NTC thermistor should be selected according to the maximum starting current value allowed by the product and the working current loaded on the NTC thermistor for a long time. At the same time, the temperature of the working environment should be considered, and the derating design should be appropriately carried out.

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