UL 248-14 475 Series SMD1140 Fast-Acting Surface Mount Fuse 11.6x4x4mm 1A 250V 72V

Description

The SMD Fuse is a very small, Wire-in-Air (WIA) square shape surface mount fuse which is very suitable for the secondary side circuit over-current protection applications and is designed for PCB using surface mount technology.

Size (mm)

Main Characteristics

Time vs Current Characteristics: UL-248-14

Specification

Note:

(1) Permissible continuous operating current is ≤100% at ambient temperature of 23°C (73.4°F)

(2) The current values used for calculating I2T should be within the standard range of 10ms.

Features

Very fast acting
Small size
Wide range of current rating available (0.062A to 20A)
Wide operating temperature range
Low temperature rerating
RoHS compliant and Halogen Free

Applications

Notebook PC
LCD/PDP TV
LCD monitor
LCD/PDP panel
LCD backlight inverter
Portable DVD player
Power supply
Networking
PC server
Cooling fan system
Storage system
Telecom system
Wireless basestation
White goods
Game console
Office Automation equipment
Battery charging circuit protection
Industrial equipment

Parameters

Consider the following parameters when choosing a proper AEM SolidMatrix® and AirMatrix® fuse:
1. Maximum Steady State operating current
2. Maximum operating temperature
3. Waveform of maximum transient pulse current
4. Pulse cycle
5. Overload current and corresponding breaking time
6. Possible maximum fault current in applications
7. Maximum operating voltage
8. Dimension
9. Compliance standard

Example

The following example describes the previous selection process.

Circuit parameters:
1. Maximum steady operating current: I=0.6A
2. Operating temperature: +65°C
3. Waveform of maximum transient pulse current (Sine wave)maximum current Ip =45.5A, pulse width t=120Sec
4. Required number of pulses to withstand: 100,000
5. Overload current and corresponding breaking time: I=10A, 60Sec
6. Possible maximum fault current in application: 50A
7. Maximum operating voltage: 12V
8. Dimension: 1206
9. Compliance standard: UL Recognized

Calculation of steady state parameters:
The minimum rated current of the fuse to meet the requirements of steady parameters is In >= I/0.75 (current derating factor)/K (temperature derating factor)= 0.6/75%/90% =0.89A. In this way, the fuse with its rated current larger than or equal to 1A is acceptable.

Calculation of transient parameters:
I2t value:
Refer to the formula in Table 1 to calculate the I2t value of pulse current. The impact of ambient temperature to pulse withstanding capability should be considered at the same time.
I2t value of pulse current:
Ip2t =0.5x(45.52A)2x120µSec= 0.1243A2Sec
This application requires the fuse to withstand 100,000 pulses under +65°C, and thus pulse and temperature derating should be considered concurrently.
If2t >= Ip2t /P(Pulse derating) /K(Temperature derating) = 0.1243/20%/90%=0.69A2Sec
Comparing the I2t vs t curve in AEM's catalog, the specification of the fuse (If2t>0.69A2Sec; t=120µSec) is not less than 3.5A If2t value. Therefore, F1206HI series fuses with the rated current larger than or equal to 3.5A are acceptable.

Protection performance:
The fuse should blow within 60s when the current is 10A. AEM's F1206HI series feature a clear time of less than 60s when the current is twice overloaded (200%). Therefore a fuse with rated current less than 5A may be selected.

Conclusion:
In conclusion, the F1206HI series from 3.5A to 5A may satisfy all product specifications as required above.Considering that the fluctuation of parameters of other comp

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​

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A large number of product series in our factory have passed the certification of various international standards




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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.

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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.