Surface Mount Fuses 2 NANO > Slo-Blo Fuse > 449 Series PS RoHS Pb E 449 Series Fuse Description 2 The lead free NANO 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 2 characteristics over the NANO 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 Agency Approvals Lead-free, Halogen free Low temperature Agency Agency File Number Ampere Range and RoHS compliant rerating E10480 0.375A - 5A Small size UL Recognized to UL/CSA/ NMX UL 248-1 and UL/ PS Wide range of current NBK030205-E10480B 1A - 5A E CSA/NMX UL 248-14 ratings available Conforms to DENANs Wide operating Appendix 3 temperature range Electrical Characteristics for Series Applications Secondary protection for space constrained applications: % of Ampere Rating Opening Time Notebook PC Storage system 100% 4 hours, Minimum LCD/PDP TV Telecom system 200% 1 sec., Min. 60 sec., Max. 300% 0.2 sec., Min. 3 sec., Max LCD monitor Wireless basestation 800% 0.002 sec., Min. 0.1 sec., Max. LCD/PDP panel White goods LCD backlight inverter Game console Portable DVD player Office Automation equipment Power supply Additional Information Battery charging circuit Networking protection PC server Industrial equipment Cooling fan system Datasheet Resources Samples Electrical Specifications by Item Max Nominal Cold Agency Approvals Ampere Rating Interrupting Nominal Melting Amp Code Voltage Rating Resistance 2 2 PS (A) Rating I t (A sec) E (V) (Ohms) 0.375 .375 125 1.5130 0.088 x 0.500 .500 125 0.7633 0.258 x 0.750 .750 125 0.4080 0.847 x 1.00 001. 125 0.2516 1.76 x x 1.50 01.5 125 0.1186 4.70 x x 50A 125 VAC/VDC 2.00 002. 125 0.0708 6.76 x x PSE: 100A 100 VAC 2.50 02.5 125 0.0400 13.18 x x 3.00 003. 125 0.0352 19.55 x x 3.50 03.5 125 0.0261 32.70 x x 4.00 004. 125 0.0227 40.80 x x 5.00 005. 125 0.0171 59.59 x x 2 Notes - l t calculated at 8ms. Resistance is measured at 10% of rated current, 25C 2019 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/21/19Surface Mount Fuses 2 NANO > Slo-Blo Fuse > 449 Series Temperature Re-rating Curve Average Time Current Curves 1000 100 10 1 Note: 1. Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation. 0.1 0.01 01 10 100 CURRENT IN AMPERES Soldering Parameters Reflow Condition Pb Free assembly t P - Temperature Min (T ) 150C T s(min) P Critical Zone Ramp-up T to T L P Pre Heat - Temperature Max (T ) 200C s(max) - Time (Min to Max) (t ) 60 180 secs T L s t L Average ramp up rate (Liquidus Temp (T ) to peak 3C/second max. T S(max) L T to T - Ramp-up Rate 3C/second max. S(max) L Ramp-down Preheat - Temperature (T ) (Liquidus) 217C L T Reflow S(min) - Temperature (t ) 60 150 seconds t L S +0/5 Peak Temperature (T ) 260 C P 25 Time within 5C of actual peak Temperature (t ) 20 40 seconds p time to peak temperature Time Ramp-down Rate 5C/second max. (t 25C to peak) Time 25C to peak Temperature (T ) 8 minutes max. P Do not exceed 260C Wave Soldering Parameters 260C Peak Temperature, 3 seconds max. 2019 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/21/19 TIME IN SECONDS .375A .500A .750A 1A 1.5A 2A 2.5A 3A 3.5A 4A 5A Temperature