![0449001.MR — Fuse, Surface Mount, 1 A, Slow Blow, 125 VAC, 125 VDC, 2410 [6125 Metric]](/media/C/1/E/72D12640CFE90E1C.webp)
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0449001.MR
Fuse, Surface Mount, 1 A, Slow Blow, 125 VAC, 125 VDC, 2410 [6125 Metric]
⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.
- Manufacturer: LITTELFUSE
- Product type: SMD Fuses
- Fuse Current:1A; Product Range:NANO2 Series; Voltage Rating VAC:125VAC; Voltage Rating V DC:125VDC; Blow Characteristic:Time Delay; Fuse Case Style:SMD; Breaking Capacity Current AC:50A; Breakin
- SVHC: No SVHC (25-Jun-2020)
- Fuse Current: 1A
- Product Range: NANO2 Slo-Blo 449 Series
- Fuse Case Style: 2410 [6125 Metric]
- Voltage Rating VAC: 125VAC
- Voltage Rating VDC: 125VDC
- Blow Characteristic: Slow Blow
- Breaking Capacity Current AC: 50A
- Breaking Capacity Current DC: 50A
| Delivery and price | |
|---|---|
| Units per pack | 1000 |
| Price | 1.08 € |
| Current stock | 1000+ |
| Lead time | 30 days |
Datasheet
**Surface Mount Fuses** NANO[2®] > Slo-Blo[®] Fuse > 449 Series ## 449 Series Fuse ## ~~**RoHS Pb**~~ **PSE** ~~|_ JQHFcSAkus<>~~ ## ~~**Description**~~ The lead free NANO[2®] 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 NANO[2®] 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. ## ~~**Agency Approvals** Pe~~ **==> picture [243 x 158] intentionally omitted <==** **----- Start of picture text -----**<br> Agency Agency File Number Ampere Range<br>cA E10480 0.375A - 5A<br>PSE NBK030205-E10480B 1A - 5A<br>Oo<br>Electrical Characteristics for Series<br>ee<br>% of Ampere Rating Opening Time<br>100% 4 hours, Minimum<br>200% 1 sec., Min.; 60 sec., Max.<br>300% 0.2 sec., Min.; 3 sec., Max<br>800% 0.002 sec., Min.; 0.1 sec., Max.<br>**----- End of picture text -----**<br> ## **Additional Information** ## ~~**Features**~~ - Lead-free, Halogen free • Low temperature and RoHS compliant rerating - Small size • UL Recognized to UL/CSA/ NMX UL 248-1 and UL/ - • Wide range of current CSA/NMX UL 248-14 - ratings available - Conforms to DENAN’s - • Wide operating Appendix 3 - temperature range ## ~~**Applications**~~ Secondary protection for space constrained applications: - Storage system - Notebook PC - LCD/PDP TV - Telecom system - LCD monitor - Wireless basestation - LCD/PDP panel - White goods - Game console - LCD backlight inverter - Office Automation equipment - Portable DVD player - Power supply - Battery charging circuit protection - Networking - PC server - Industrial equipment - Cooling fan system **==> picture [197 x 9] intentionally omitted <==** **----- Start of picture text -----**<br> Datasheet Resources Samples<br>**----- End of picture text -----**<br> ## ~~**Electrical Specifcations by Item**~~ **==> picture [504 x 157] intentionally omitted <==** **----- Start of picture text -----**<br> Ampere Rating(A) Amp Code Voltage Rating Max(V) InterruptingRating Nominal Cold Resistance (Ohms) Nominal Melting I [2] t (A [2] sec) Po Agency ApprovalsPSE<br>0.375 .375 | 125 es 1.5130 0.088 x<br>0.500 .500 125 0.7633 0.258 x<br>| ee<br>0.750 .750 | 125 a 0.4080 0.847 ee ee x<br>1.00 001. 125 0.2516 1.76 x x<br>| po<br>1.50 01.5 | 125 50A @125 VAC/VDC a 0.1186 4.70 ee ee x x<br>2.00 002. 125 0.0708 6.76 x x<br>2.50 02.5 || 125 PSE: 100A @100 VAC apo 0.0400 13.18 ee ee x x<br>3.00 003. 125 0.0352 19.55 x x<br>| po<br>3.50 03.5 = 125 a 0.0261 32.70 ee ee x x<br>4.00 004. 125 0.0227 40.80 x x<br>5.00 005. | 125 = 0.0171 59.59 x x<br>rr ee ae ee ee<br>Notes - l [2] t calculated at 8ms. Resistance is measured at 10% of rated current, 25ºC<br>**----- End of picture text -----**<br> © 2019 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/21/19 **Surface Mount Fuses** NANO[2®] > Slo-Blo[®] Fuse > 449 Series **==> picture [94 x 32] intentionally omitted <==** **==> picture [262 x 19] intentionally omitted <==** **----- Start of picture text -----**<br> Temperature Re-rating Curve<br>**----- End of picture text -----**<br> **==> picture [262 x 19] intentionally omitted <==** **----- Start of picture text -----**<br> Average Time Current Curves<br>**----- End of picture text -----**<br> **==> picture [244 x 323] intentionally omitted <==** **----- Start of picture text -----**<br> 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> **==> picture [244 x 197] intentionally omitted <==** ## **Note:** **1.** Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation. ## ~~**Soldering Parameters**~~ |**Refow Condition**<br>**Pre Heat**<br>**- Temperature Min (Ts(min))**<br>**- Temperature Max (Ts(max))**|**Refow Condition**<br>**Pre Heat**<br>**- Temperature Min (Ts(min))**<br>**- Temperature Max (Ts(max))**|Pb – Free assembly<br>150°C<br>200°C| |---|---|---| |**- Time (Min to Max) (ts)**<br>**Average ramp up rate (Liquidus Temp (TL) to peak**<br>**TS(max) to TL - Ramp-up Rate**<br>**Refow**<br>**- Temperature (TL) (Liquidus)**<br>**- Temperature (tL)**||60 – 180 secs<br>3°C/second max.<br>3°C/second max.<br>217°C<br>60 – 150 seconds| |**Peak Temperature (TP)**||260+0/–5°C| |**Time within 5°C of actual peak Temperature (tp)**<br>**Ramp-down Rate**||20 – 40 seconds<br>5°C/second max.| |**Time 25°C to peak Temperature (TP)**||8 minutes max.| |**Do not exceed**||260°C| |||| |**Wave Soldering Parameters**|260°C Peak Temperature, 3 seconds max.|| **==> picture [244 x 150] intentionally omitted <==** **----- Start of picture text -----**<br> t P<br>T P<br>Critical Zone<br>Ramp-up TL to TP<br>T S(max) T L t L<br>Ramp-down<br>Preheat<br>T S(min)<br>t S<br>25<br>time to peak temperature Time<br>(t 25ºC to peak)<br>Temperature<br>**----- End of picture text -----**<br> © 2019 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/21/19 **Surface Mount Fuses** NANO[2®] > Slo-Blo[®] Fuse > 449 Series **==> picture [94 x 32] intentionally omitted <==** ## ~~**Product Characteristics**~~ |**Materials**|**Body:**Ceramic<br>**Terminations:**Gold-plated Caps| |---|---| |**Product Marking**<br>**Operating Temperature**<br>**Moisture Sensitivity Level**|Brand, Amperage Rating<br>-55°C to 125°C<br>Level 1, J-STD-020| |**Solderability**|MIL-STD-202, Method 208| |**Insulation Resistance**|MIL-STD-202, Method 302, Test Condition A| |**(after Opening)**|(10,000 ohms minimum)| ||MIL-STD-202, Method 107, Test Condition| |---|---| |**Thermal Shock**|B, 5 cycles, -65°C to 125°C, 15 minutes @| ||each extreme| ||MIL-STD-202, Method 213, Test I:| |**Mechanical Shock**|Deenergized. 100G’s pk amplitude,<br>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| |**Salt Spray**|MIL-STD-202, Method 101, Test Condition<br>B(48hrs)| |**Resistance to Soldering Heat**|MIL-STD-202, Method 210, Test condition<br>B(10 sec at 260°C)| **==> picture [522 x 241] intentionally omitted <==** **----- Start of picture text -----**<br> Dimensions Part Numbering System<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>Packaging<br>Quantity &<br>Packaging Option Packaging Specification Quantity Packaging Code<br>12mm Tape and Reel EIA RS-481-2 (IEC 286, part 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. © 2019 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/21/19
Updated at June 9, 2026
Founded in 1927 and headquartered in Chicago, Illinois, Littelfuse is a premier global manufacturer of circuit protection, power control, and sensing technologies. Widely recognized for pioneering the first small, fast-acting protective fuse, the company has grown into an industry leader whose highly reliable components are essential to modern industrial, transportation, and consumer electronics applications worldwide. At the core of the Littelfuse portfolio is an expansive and industry-leading range of circuit protection solutions. This encompasses a massive selection of traditional fuses, fuse holders, and resettable PTC thermistor fuses designed to safely interrupt overcurrent conditions. To defend against electrical overstress, Littelfuse also provides advanced transient voltage suppression (TVS) technologies, including thousands of specialized TVS diodes, TVS varistors, and gas discharge tubes (GDTs) that ensure robust defense against voltage spikes and environmental hazards. Beyond its foundational protection components, Littelfuse manufactures a diverse array of discrete semiconductors, sensors, and switching devices. Engineers rely on their high-performance thyristors, including TRIACs and SCRs, alongside power-efficient Schottky diodes and MOSFETs for demanding power control applications. Complemented by precision proximity sensors and highly reliable reed and solid-state relays, Littelfuse delivers the critical building blocks required for secure, efficient, and complete system design.
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