0449003.MR

Surface Mount Fuses **Datasheet** 

**449 Series** NANO2[®] > Slo-Blo[®] 

## **RoHS Pb PSE** C_J@H ~~F~~ dus <> YS C ~~E~~ 

## **Description** 

The lead free NANO2[®] Slo-Blo[®] fuse is RoHS compliant, Halogen Free and 100% lead-free. This product is fully compatible with lead-free solder alloys and higher temperature profiles associated with lead-free assembly. The Slo-Blo[®] fuse design has enhanced inrush withstand characteristics over the NANO2[®] Fast-Acting Fuse. The unique time delay feature of this fuse design helps solve the problem of nuisance “opening” by accommodating inrush currents that normally cause a fast-acting fuse to open. 

## **Features & Benefits** 

## **Additional Information** 

- Lead-free, Halogen free and ■ UL Recognized to UL/CSA/ RoHS compliant NMX UL 248-1 and UL/CSA/ NMX UL 248-14 

- Small size 

- Wide range of current ratings ■ Conforms to DENAN’s available Appendix 3 

- Wide operating temperature range 

**Resources Accessories Samples** 

**Agency Approvals** 

## **Applications** 

Secondary protection for space constrained applications: 

|**Agency**<br>cd us|**Agency File Number**<br>E10480|**Ampere Range**<br>0.375A - 5A|
|---|---|---|
|**PS**<br>**E**<br>~~Se~~|NBK030205-E10480B|1A - 5A|
|~~Se~~<br>c~~e~~|N/A|0.375A - 5A|
|c~~e~~|N/A|0.375A - 5A|



## **Electrical Characteristics for Series** 

|**% of Ampere Rating**|**Opening Time**|
|---|---|
|100%|4 hours, Minimum|
|200%|1 sec., Min.; 60 sec., Max.|
|300%|0.2 sec., Min.; 3 sec., Max|
|800%|0.002 sec., Min.; 0.1 sec., Max.|



- Notebook PC ■ Storage system 

- ■ LCD/PDP TV ■ Telecom system 

- LCD monitor ■ Wireless basestation 

- LCD/PDP panel 

   - White goods 

   - Game console 

- LCD backlight inverter 

- Portable DVD player ■ Office Automation equipment 

- Power supply 

- Power supply ■ Battery charging circuit 

- ■ Networking protection ■ PC server ■ Industrial equipment 

- Cooling fan system 

## **Electrical Specifications by Item** 

|**Ampere Rating**<br>**(A)**<br>0.375|**Amp**<br>**Code**<br>.375|**Max**<br>**Voltage Rating**<br>**(V)**<br>125|**Interrupting**<br>**Rating**<br>50A @125 VAC/VDC<br>PSE: 100A @100 VAC|**Nominal Cold**<br>**Resistance**<br>**(Ohms)**<br>1.5130|**Nominal Melting**<br>**I2t (A2sec)**<br>0.088|**Agency Approvals**|**Agency Approvals**|**Agency Approvals**|**Agency Approvals**|
|---|---|---|---|---|---|---|---|---|---|
|||||||x<br>rat|x<br>C~~c~~|x<br>Wks|**PS**<br>**E**<br>-<br> <|
|0.500|.500|125||0.7633|0.258|x|x|x|-|
|0.750|.750|125||0.4080|0.847|x|x|x|-|
|1.00|001.|125||0.2516|1.76|x|x|x|x|
|1.50|01.5|125||0.1186|4.70|x|x|x|x|
|2.00|002.|125||0.0708|6.76|x|x|x|x|
|2.50|02.5|125||0.0400|13.18|x|x|x|x|
|3.00|003.|125||0.0352|19.55|x|x|x|x|
|3.50|03.5|125||0.0261|32.70|x|x|x|x|
|4.00|004.|125||0.0227|40.80|x|x|x|x|
|5.00|005.|125||0.0171|59.59|x|x|x|x|



**Notes -** l[2] t calculated at 8ms. Resistance is measured at 10% of rated current, 25ºC 

© 2023 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 06/26/23 

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Surface Mount Fuses **Datasheet** 

**449 Series** NANO2[®] > Slo-Blo[®] 

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## **Temperature Re-rating Curve** 

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## **Note:** 

**1.** Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation. 

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## **Average Time Current Curves** 

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1000<br>100<br>10<br>1<br>0.1<br>0.01<br>0 1 10 100<br>CURRENT IN AMPERES<br>.375A .500A .750A 1A 1.5A2A 2.5A 3A3.5A 4A 5A<br>TIME IN SECONDS<br>**----- End of picture text -----**<br>


## **Soldering Parameters** 

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Pb – Free<br>Reflow Condition<br>assembly<br>- Temperature Min (Ts(min)) 150°C  T P t P<br>Critical Zone<br>Pre Heat - Temperature Max (Ts(max)) 200°C Ramp-up TL to TP<br>Average ramp up rate (Liquidus Temp (T- Time (Min to Max) (ts) L) to peak 60 – 180 secs3°C/second max. T S(max) T L t L<br>TS(max) to TL - Ramp-up Rate 3°C/second max. Ramp-down<br>Reflow - Temperature (T- Temperature (tLL)) (Liquidus) 217°C 60 – 150 seconds T S(min) tPreheat S<br>Peak Temperature (TP) 260 [+0/–5]  °C<br>Time within 5°C of actual peak Temperature (tp) 20 – 40 seconds 25<br>Ramp-down Rate 5°C/second max. time to peak temperature(t 25ºC to peak) Time<br>Time 25°C to peak Temperature (TP) 8 minutes max.<br>Do not exceed 260°C<br>260°C Peak Temperature,<br>Wave Soldering Parameters<br>3 seconds max.<br>Temperature<br>**----- End of picture text -----**<br>


© 2023 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 06/26/23 

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Surface Mount Fuses **Datasheet** 

**449 Series** NANO2[®] > Slo-Blo[®] 

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## **Product Characteristics** 

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Body:  Ceramic<br>Materials<br>Terminations:  Gold-plated Caps<br>Product Marking Brand, Amperage Rating<br>Operating Temperature -55°C to 125°C<br>Moisture Sensitivity Level Level 1, J-STD-020<br>Solderability MIL-STD-202, Method 208<br>Insulation Resistance  MIL-STD-202, Method 302, Test<br>(after Opening) Condition A (10,000 ohms minimum)<br>**----- End of picture text -----**<br>


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MIL-STD-202, Method 107, Test<br>Thermal Shock Condition B, 5 cycles, -65°C to 125°C,<br>15 minutes @ each extreme<br>MIL-STD-202, Method 213, Test I:<br>Deenergized.  100G’s pk amplitude,<br>Mechanical Shock<br>sawtooth wave 6ms duration, 3<br>cycles XYZ+xyz = 18 shocks<br>MIL-STD-202, Method 201: 0.03"<br>Vibration amplitude, 10-55 Hz in 1 min.  2hrs<br>each XYZ=6hrs<br>Moisture Resistance MIL-STD-202, Method 106, 10 cycles<br>MIL-STD-202, Method 101, Test<br>Salt Spray<br>Condition B (48hrs)<br>MIL-STD-202, Method 210, Test<br>Resistance to Soldering Heat condition B (10 sec at 260°C)<br>**----- End of picture text -----**<br>


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Dimensions  Part Numbering System<br>mm (inches)<br>0449      001.    M   R<br>6.86 6.10 ± .20<br>(.270") (.240") Series<br>3.15 1 A AMP Code*<br>(.124") F T Refer to Electrical characteristics table<br>1.45<br>2.95 (.057") Quantity Code<br>1.96 (.116") M = 1000 pcs<br>(.077") 2.69 ± .25<br>Packaging Code<br>Recommended pad layout (.106")<br>R = Tape and Reel<br>2.69 ± .25 *Example:<br>(.106") 0.375 Amp product is 0449.375MR (1 amp<br>product shown above).<br>**----- End of picture text -----**<br>


## **Packaging** 

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Packaging Option Packaging Specification Quantity Quantity & Packaging Code<br>12mm Tape and Reel EIA RS-481-2 IEC 60286-3 1000 MR<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. 

© 2023 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 06/26/23 

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