# Fuse, Surface Mount, 3 A, Slow Blow, 125 V, 125 V, 2410 [6125 Metric], NANO2 Slo-Blo 449 Series
**URL**: https://novapart.co/products/0449003.MR/fuse-surface-mount-3-a-slow-blow-125-v-2410-6125
**SKU**: 0449003.MR
**Manufacturer**: LITTELFUSE
**Category**: Circuit Protection || Fuses & Fuse Accessories || Fuses || SMD Fuses
**Price**: €1.0900
**Stock**: 1000+
**Lead Time**: 85 days (indicative)
## Specifications
| Parameter | Value |
|---|---|
| Svhc | No SVHC (07-Nov-2024) |
| Fuse Current | 3A |
| Product Range | NANO2 Slo-Blo 449 Series |
| Fuse Case Style | 2410 [6125 Metric] |
| Voltage Rating Vac | 125V |
| Voltage Rating Vdc | 125V |
| Blow Characteristic | Slow Blow |
| Breaking Capacity Current Ac | 50A |
| Breaking Capacity Current Dc | 50A |
## Datasheet
📄 [Download PDF](https://novapart.co/datasheet/farnell:4626809/)
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**
cd us|**Agency File Number**
E10480|**Ampere Range**
0.375A - 5A|
|---|---|---|
|**PS**
**E**
~~Se~~|NBK030205-E10480B|1A - 5A|
|~~Se~~
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**
**(A)**
0.375|**Amp**
**Code**
.375|**Max**
**Voltage Rating**
**(V)**
125|**Interrupting**
**Rating**
50A @125 VAC/VDC
PSE: 100A @100 VAC|**Nominal Cold**
**Resistance**
**(Ohms)**
1.5130|**Nominal Melting**
**I2t (A2sec)**
0.088|**Agency Approvals**|**Agency Approvals**|**Agency Approvals**|**Agency Approvals**|
|---|---|---|---|---|---|---|---|---|---|
|||||||x
rat|x
C~~c~~|x
Wks|**PS**
**E**
-
<|
|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
**1**
Surface Mount Fuses **Datasheet**
**449 Series** NANO2[®] > Slo-Blo[®]
**==> picture [46 x 52] intentionally omitted <==**
## **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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**----- Start of picture text -----**
1000
100
10
1
0.1
0.01
0 1 10 100
CURRENT IN AMPERES
.375A .500A .750A 1A 1.5A2A 2.5A 3A3.5A 4A 5A
TIME IN SECONDS
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## **Soldering Parameters**
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Pb – Free
Reflow Condition
assembly
- Temperature Min (Ts(min)) 150°C T P t P
Critical Zone
Pre Heat - Temperature Max (Ts(max)) 200°C Ramp-up TL to TP
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
TS(max) to TL - Ramp-up Rate 3°C/second max. Ramp-down
Reflow - Temperature (T- Temperature (tLL)) (Liquidus) 217°C 60 – 150 seconds T S(min) tPreheat S
Peak Temperature (TP) 260 [+0/–5] °C
Time within 5°C of actual peak Temperature (tp) 20 – 40 seconds 25
Ramp-down Rate 5°C/second max. time to peak temperature(t 25ºC to peak) Time
Time 25°C to peak Temperature (TP) 8 minutes max.
Do not exceed 260°C
260°C Peak Temperature,
Wave Soldering Parameters
3 seconds max.
Temperature
**----- End of picture text -----**
© 2023 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 06/26/23
**2**
Surface Mount Fuses **Datasheet**
**449 Series** NANO2[®] > Slo-Blo[®]
**==> picture [46 x 52] intentionally omitted <==**
**==> picture [311 x 52] intentionally omitted <==**
## **Product Characteristics**
**==> picture [245 x 89] intentionally omitted <==**
**----- Start of picture text -----**
Body: Ceramic
Materials
Terminations: Gold-plated Caps
Product Marking Brand, Amperage Rating
Operating Temperature -55°C to 125°C
Moisture Sensitivity Level Level 1, J-STD-020
Solderability MIL-STD-202, Method 208
Insulation Resistance MIL-STD-202, Method 302, Test
(after Opening) Condition A (10,000 ohms minimum)
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MIL-STD-202, Method 107, Test
Thermal Shock Condition B, 5 cycles, -65°C to 125°C,
15 minutes @ each extreme
MIL-STD-202, Method 213, Test I:
Deenergized. 100G’s pk amplitude,
Mechanical Shock
sawtooth wave 6ms duration, 3
cycles XYZ+xyz = 18 shocks
MIL-STD-202, Method 201: 0.03"
Vibration amplitude, 10-55 Hz in 1 min. 2hrs
each XYZ=6hrs
Moisture Resistance MIL-STD-202, Method 106, 10 cycles
MIL-STD-202, Method 101, Test
Salt Spray
Condition B (48hrs)
MIL-STD-202, Method 210, Test
Resistance to Soldering Heat condition B (10 sec at 260°C)
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Dimensions Part Numbering System
mm (inches)
0449 001. M R
6.86 6.10 ± .20
(.270") (.240") Series
3.15 1 A AMP Code*
(.124") F T Refer to Electrical characteristics table
1.45
2.95 (.057") Quantity Code
1.96 (.116") M = 1000 pcs
(.077") 2.69 ± .25
Packaging Code
Recommended pad layout (.106")
R = Tape and Reel
2.69 ± .25 *Example:
(.106") 0.375 Amp product is 0449.375MR (1 amp
product shown above).
**----- End of picture text -----**
## **Packaging**
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**----- Start of picture text -----**
Packaging Option Packaging Specification Quantity Quantity & Packaging Code
12mm Tape and Reel EIA RS-481-2 IEC 60286-3 1000 MR
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**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
**3**
## Links
- [View this product on Novapart](https://novapart.co/products/0449003.MR/fuse-surface-mount-3-a-slow-blow-125-v-2410-6125)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/littelfuse/0449003-mr/smd-fuses/dp/4626809)
---
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