0440008.WR.

Fuse **Datasheet** 

**440 Series** 1206 High I[2] t Fuse 

## **RoHS Pb** [[IQHF] Adu G, 

## **Description** 

The 440 Series is a 100% RoHS Compliant, lead-free and halogenfree fuse series designed specifically to provide over-current protection to circuits that operate under high working ambient temperatures up to 150ºC and high inrush currents. The general design ensures excellent temperature stability and performance reliability. This high I2t fuse series is designed to have ultra high inrush current withstand capability to avoid nuisance fuse open. 

## **Features and Benefits** 

- Operating Temperature from ■ Ultra high I2t values -55ºC to +150ºC 

   - Recognized to UL/CSA/NMX 

- RoHS compliant, lead-free and 248-1 and UL/CSA/NMX 248-14 halogen-free 

## **Additional Information** 

- Suitable for both leaded and lead-free reflow / wave soldering 

## **Applications** 

- LCD Displays ■ Scanners 

- Servers ■ Data Modems 

- Notebook Computers ■ Hard Disk Drives 

**Resources Accessories Samples** 

■ Printers 

## **Electrical Characteristics for Series** 

|**% of Ampere Rating**<br>100%|**Ampere Rating**<br>0.25A - 8A|**Opening Time at 25ºC**<br>4 hours, Minimum|
|---|---|---|
|350%|0.25A - 8A|5 secs., Maximum|



## **Agency Approvals** 

|**Agency**<br>cds|**Agency File Number**<br>E10480|**Ampere Range**<br>0.25A - 8A|
|---|---|---|
|@,|29862|0.25A - 8A|



## **Electrical Specifications by Item** 

|**Ampere**<br>**Rating**<br>**(A)**<br>0.250|**Amp**<br>**Code**<br>.250|**Max. Voltage**<br>**Rating (V)**<br>125|**Interrupting Rating**<br>**(AC/DC)1**<br>50 A @ 125 V AC/DC|**Nominal**<br>**Resistance**<br>**(Ohms)2**<br>2.140|**Nominal**<br>**Melting I2t **<br>**(A2Sec.)3**<br>0.00649|**Nominal Voltage**<br>**Drop At Rated**<br>**Current (V)4**<br>0.5260|**Nominal Power**<br>**Dissipation At Rated**<br>**Current (W)**<br>0.132|**Agency Approvals**|**Agency Approvals**|
|---|---|---|---|---|---|---|---|---|---|
|||||||||X<br>A,<br>\Ve|X<br>VeGR|
|0.375|.375|125||1.216|0.01455|0.4993|0.187|X|X|
|0.500|.500|63|50 A @ 63 V AC/DC|0.8140|0.02642|0.4831|0.242|X|X|
|0.750|.750|63|50 A @ 63 V AC/DC|0.4624|0.09312|0.3983|0.299|X|X|
|1.00|001.|50|50 A @ 50 V DC<br>50 A @ 50 V AC|0.3096|0.21054|0.3457|0.346|X|X|
|1.25|1.25|50||0.2265|0.379|0.3240|0.405|X|X|
|1.50|01.5|50||0.1759|0.50652|0.3215|0.482|X|X|
|1.75|1.75|32|50 A @ 32 V AC/DC|0.0450|0.3312|0.0777|0.136|X|X|
|2.00|002.|32||0.0385|0.4326|0.0792|0.158|X|X|
|2.50|02.5|32||0.02850|0.8191|0.0747|0.187|X|X|
|3.00|003.|32||0.02252|1.232|0.0742|0.223|X|X|
|3.50|03.5|32||0.01845|1.789|0.0757|0.265|X|X|
|4.00|004.|32||0.01553|2.601|0.0709|0.284|X|X|
|5.00|005.|32||0.0120|4.761|0.0654|0.327|X|X|
|7.00|007.|32||0.00753|8.464|0.0696|0.487|X|X|
|8.00|008.|32||0.00634|12.95|0.0655|0.524|X|X|



## **Notes:** 

1. AC Interrupting Rating tested at rated voltage with unity power factor. DC Interrupting Rating tested at rated voltage with time constant < 0.8 msec. 

2. Nominal Resistance measured with < 10% rated current. 

3. Contact Littelfuse if application transient surges are less than 1 ms. 

Devices designed to carry rated current for 4 hours minimum. It is recommended that devices be operated continuously at no more than 80% rated current. See “Temperature Derating Curve”for additional derating information. 

Devices designed to be mounted with marking code facing up. 

4. Nominal Voltage Drop measured at rated current after temperature has stabilized. 

© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/16/20 

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Fuse **Datasheet** 

**440 Series** 1206 High I[2] t Fuse 

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## **Temperature Rerating Curve** 

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**----- Start of picture text -----**<br>
140<br>120<br>100<br>80<br>60<br>40<br>-65     -45      -25       -5        15       35       55       75       95      115     135    155<br>TEMPERATURE (°C)<br>PERCENT OF RATING<br>**----- End of picture text -----**<br>


## **Note:** 

1. Rerating depicted in this curve is in addition to the standard derating of 20% for continuous operation. **Example:** 

- For continuous operation at 75 degrees celsius, the fuse should be derated as follows: I = (0.80)(0.85)In = (0.68)In 

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## **Average Time Current Curves** 

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100<br>10<br>1<br>0.1<br>0.01<br>0.001<br>0.1  1.0 10.0 100.0 1000.<br>CURRENT IN AMPERES<br>TIME IN SECONDS<br>**----- End of picture text -----**<br>


## **Soldering Parameters** 

|**Refow Condition**|**Refow Condition**|Pb-free assembly|
|---|---|---|
|**Pre Heat**|**- Temperature Min (Ts(min))**|150°C|
||**- Temperature Max (Ts(max))**|200°C|
||**- Time (Min to Max) (ts)**|60 – 180 seconds|
|**Average Ramp-Up Rate (Liquidus Temp (TL) to**<br>**peak)**||3°C/second max.|
|**TS(max) to TL -**|**Ramp-up Rate**|5°C/second max.|
|**Refow**|**- Temperature (TL) (Liquidus)**|217°C|
||**- Temperature (tL)**|60 – 150 seconds|
|**Peak Temperature (TP)**||260+0/-5°C|
|**Time within 5°C of actual peak Temperature (tp)**||10 – 30 seconds|
|**Ramp-down Rate**||6°C/second max.|
|**Time 25°C to peak Temperature (TP)**||8 minutes max.|
|**Do not exceed**||260°C|



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**----- Start of picture text -----**<br>
t P<br>T P<br>Critical Zone<br>Ramp-up TL to TP<br>T L<br>t L<br>T S(max)<br>Ramp-down<br>T S(min)<br>t S<br>Preheat<br>25ºC<br>t 25ºC to Peak<br>Time (t)<br>Temperature (T)<br>**----- End of picture text -----**<br>


> **Wave Soldering** 260°C, 10 seconds max. 

© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/16/20 

**2** 

Fuse **Datasheet** 

**440 Series** 1206 High I[2] t Fuse 

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## **Product Characteristics** 

|**Materials**|**Body:**Advanced Ceramic<br>**Terminations:**Ag / Ni / Sn (100% Lead-free)<br>**Element Cover Coating:**Lead-free Glass|
|---|---|
|**Moisture**<br>**Sensitivity Level**|IPC/JEDEC J-STD-020, Level 1|
|**Solderability**|IPC/ECA/JEDEC J-STD-002, Condition C|
|**Humidity Test**|MIL-STD-202, Method 103, Conditions D|
|**Resistance to**<br>**Solder Heat**|MIL-STD-202, Method 210, Condition B|



## **Dimensions** mm (inches) 

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**----- Start of picture text -----**<br>
3.200 ± .1778<br>[.126 ± .007]<br>1.000 1.63 + .10/ -.20<br>[.039] [.064 + .004/ -.008]<br>X<br>.8179 +.046/ -.076<br>[.0322 +.0018/ -.003]<br>TERMINATION<br>0.520 ± .200<br>[.020 ± .008]<br>1.000 1.500<br>[.039] [.059]<br>1.800<br>[.071]<br>3.500<br>[.138]<br>**----- End of picture text -----**<br>


|**Moisture Resistance**|MIL-STD-202, Method 106|
|---|---|
|**Thermal Shock**|MIL-STD-202, Method 107,<br>Condition B|
|**Mechanical Shock**|MIL-STD-202, Method 213,<br>Condition A|
|**Vibration**|MIL-STD-202, Method 201|
|**Vibration,**<br>**High Frequency**|MIL-STD-202, Method 204,<br>Condition D|
|**Dissolution of**<br>**Metallization**|IPC/ECA/JEDEC J-STD-002,<br>Condition D|
|**Terminal Strength**|IEC 60127-4|



## **Part Marking System** 

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**----- Start of picture text -----**<br>
Amp Code Marking Code Amp Code Marking Code<br>.250 D 002. N<br>.375 E 02.5 O<br>.500 F 003. P<br>.750 G 03.5 R<br>001. H 004. S<br>1.25 J 005. T<br>01.5 K 007. W<br>1.75 L 008. X<br>**----- End of picture text -----**<br>


## **Part Numbering System** 

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0440 008.  W   R<br>SERIES<br>AMP CODE<br>QUANTITY CODE<br>W = 3000 pcs<br>**----- End of picture text -----**<br>


**PACKING CODE** R = Reel Pack 

## **Packaging** 

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Packaging  Quantity &<br>Packaging Specification Quantity<br>Option  Packaging Code<br>8mm Tape  EIA-481, IEC 60286,<br>3000 WR<br>and Reel Part 3<br>**----- End of picture text -----**<br>


**Disclaimer Notice -** Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation.  Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation.  Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation.  The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications.  Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics. 

© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/16/20 

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