Surface Mount Fuses NANO2(R) > Slo-Blo(R) Fuse > 449 Series 449 Series Fuse PS E Pb RoHS Description The lead free NANO2(R) Slo-Blo(R) 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(R) fuse design has enhanced inrush withstand characteristics over the NANO2(R) 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% 0.002 sec., Min.; 0.1 sec., Max. Additional Information Resources * Wide operating temperature range * Low temperature rerating Applications Electrical Characteristics for Series Datasheet * Lead-free, Halogen free and RoHS compliant * 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, 25C (c) 2018 Littelfuse, Inc. Specifications are subject to change without notice. Application testing is strongly recommended. Revised: 06/06/18 Surface Mount Fuses NANO2(R) > Slo-Blo(R) 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)) 150C - Temperature Max (Ts(max)) 200C - Time (Min to Max) (ts) 60 - 120 secs Average ramp up rate (Liquidus Temp (TL) to peak 3C/second max. TS(max) to TL - Ramp-up Rate 3C/second max. Reflow - Temperature (TL) (Liquidus) 217C - Temperature (tL) 60 - 90 seconds Peak Temperature (TP) 260+0/-5 C Time within 5C of actual peak Temperature (tp) 20 - 40 seconds Ramp-down Rate 5C/second max. Time 25C to peak Temperature (TP) 8 minutes max. Do not exceed 260C Wave Soldering Parameters 260C 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 25C to peak) Time (c) 2018 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 06/06/18 Surface Mount Fuses NANO2(R) > Slo-Blo(R) 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, -65C to 125C, 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 -55C to 125C 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 260C) 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 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. (c) 2018 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 06/06/18