Surface Mount Fuses NANO2® > Slo-Blo® Fuse > 449 Series 449 Series Fuse RoHS PS E Pb 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 Agency Approvals AGENCY AGENCY FILE NUMBER AMPERE RANGE E10480 0.375A - 5A NBK030205-E10480B 1A - 5A PS E % 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% 0.02 sec., Min.; 0.1 sec., Max. Additional Information Resources • Wide operating temperature range • Low temperature rerating Applications Electrical Characteristics for Series Datasheet • Lead-free and Halogen Free • Small size • Wide range of current ratings available Secondary protection for space constrained applications: • Storage system • Notebook PC • Telecom system • LCD/PDP TV • Wireless basestation • LCD monitor • White goods • LCD/PDP panel • Game console • LCD backlight inverter • Office Automation • Portable DVD player equipment • Power supply • Battery charging circuit •Networking protection • PC server • Industrial equipment • Cooling fan system Samples Electrical Specifications by Item Ampere Rating (A) Amp Code Max Voltage Rating (V) Interrupting Rating Nominal Cold Resistance (Ohms) Nominal Melting I2t (A2sec) Agency Approvals PS E 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 2.00 002. 125 0.0708 6.76 x x 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 50A @125 VAC/VDC PSE: 100A @100 VAC Notes: - l2t calculated at 8ms. Resistance is measured at 10% of rated current, 25ºC © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Application testing is strongly recommended. Revised: 06/21/15 Surface Mount Fuses NANO2® > Slo-Blo® Fuse > 449 Series .750A 1A 1.5A 2A 2.5A 3A 3.5A 4A 5A Average Time Current Curves .375A .500A Temperature Re-rating Curve 1000 TIME IN SECONDS 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 0 1 10 100 CURRENT IN AMPERES Soldering Parameters Pre Heat Pb – Free assembly - Temperature Min (Ts(min)) 150°C - Temperature Max (Ts(max)) 200°C - Time (Min to Max) (ts) 60 – 120 secs Average ramp up rate (Liquidus Temp (TL) to peak 3°C/second max. TS(max) to TL - Ramp-up Rate 3°C/second max. Reflow - Temperature (TL) (Liquidus) 217°C - Temperature (tL) 60 – 90 seconds Peak Temperature (TP) 260+0/–5 °C Time within 5°C of actual peak Temperature (tp) 20 – 40 seconds Ramp-down Rate 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. tP TP Temperature Reflow Condition Critical Zone TL to TP Ramp-up TL TS(max) tL Ramp-down TS(min) Preheat tS 25 time to peak temperature (t 25ºC to peak) Time © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 06/21/15 Surface Mount Fuses NANO2® > Slo-Blo® Fuse > 449 Series Product Characteristics Materials Body: Ceramic Terminations: Gold-plated Caps Product Marking Brand, Amperage Rating Operating Temperature Moisture Sensitivity Level MIL-STD-202, Method 107, Test 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, sawtooth wave 6ms duration, 3 cycles XYZ+xyz = 18 shocks MIL-STD-202, Method 201: 0.03" amplitude, 10-55 Hz in 1 min. 2hrs each XYZ=6hrs Thermal Shock Mechanical Shock -55°C to 125°C Level 1, J-STD-020 Vibration Solderability MIL-STD-202, Method 208 Insulation Resistance (after Opening) MIL-STD-202, Method 302, Test Condition A (10,000 ohms minimum) MIL-STD-202, Method 106, 10 cycles Moisture Resistance Salt Spray Resistance to Soldering Heat Dimensions Part Numbering System 3.15 (.124") 1.96 (.077") Recommended pad layout 0449 001. M R 6.10 ± .20 (.240") 6.86 (.270") 2.95 (.116") MIL-STD-202, Method 101, Test Condition B (48hrs) MIL-STD-202, Method 210, Test condition B (10 sec at 260°C) F SERIES 1A T AMP Code* Refer to Electrical characteristics table 1.45 (.057") 2.69 ± .25 (.106") QUANTITY Code M = 1000 pcs PACKAGING Code R = Tape and Reel 2.69 ± .25 (.106") *Example: 0.375 Amp product is 0449.375MR (1 amp product shown above). Packaging Packaging Option Packaging Specification Quantity Quantity & Packaging Code 12mm Tape and Reel EIA RS-481-2 (IEC 286, part 3) 1000 MR © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 06/21/15