449

Surface Mount Fuses NANO2® > Slo-Blo® > 449 Series 449 Series Fuse Description PS E 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® 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 E10480 PS E Free ® temperature range de-rating AMPERE RANGE 375mA - 5A 1A - 5A ratings available Applications Secondary protection for space constrained applications: NBK030205 Electrical Characteristics for Series % of Ampere Rating 100% 200% 300% 800% Opening Time 4 hours, Minimum 1 sec., Min.; 60 sec., Max. 0.2 sec., Min.; 3 sec., Max 0.02 sec., Min.; 0.1 sec., Max. equipment protection Electrical Specifications by Item Ampere Rating (A) 0.375 0.500 0.750 1.00 1.50 2.00 2.50 3.00 3.50 4.00 5.00 Max Voltage Rating (V) 125 125 125 125 125 125 125 125 125 125 125 PSE: 100 amperes @100 VAC 50 amperes @125 VAC/ VDC Interrupting Rating Nominal Cold Resistance (Ohms) 1.5130 0.7633 0.4080 0.2516 0.1186 0.0708 0.0400 0.0352 0.0261 0.0227 0.0171 Nominal Melting I2t (A2sec) 0.088 0.258 0.847 1.76 4.70 6.76 13.18 19.55 32.70 40.80 59.59 Agency Approvals PS E Amp Code 0.375 0.500 0.750 001. 01.5 002. 02.5 003. 03.5 004. 005. x x x x x x x x x x x x x x x x x x x Notes: - l2t calculated at 8ms. Resistance is measured at 10% of rated current, 25ºC © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/449.html for current information. 53 Revised: December 17, 2010 449 Series 449 Series S Introduction to Circuit Protection Introduction urface Mount Fuses Transientology NANO2® > Slo-Blo® > 449 Series Temperature Rerating Curve Average Time Current Curves .375A .500A 1000 100 TIME IN SECONDS 10 1 Note: 1. Derating depicted in this curve is in addition to the standard derating of 25% for continuous operation. 0.1 0.01 0 .750A 1A 1.5A 2A 2.5A 3A 3.5A 4A 5A 1 10 100 CURRENT IN AMPERES Soldering Parameters Reflow Condition - Temperature Min (Ts(min)) Pre Heat - Temperature Max (Ts(max)) - Time (Min to Max) (ts) Average ramp up rate (Liquidus Temp (TL) to peak TS(max) to TL - Ramp-up Rate Reflow - Temperature (TL) (Liquidus) - Temperature (tL) Pb – Free assembly 150°C 60 – 120 secs 3°C/second max. 3°C/second max. 217°C 60 – 90 seconds 250 +0/-5 TP Ramp-up tP Critical Zone TL to TP Temperature 200°C TL TS(max) Preheat tL Ramp-down TS(min) tS 25 time to peak temperature (t 25ºC to peak) Time Peak Temperature (TP) Time within 5°C of actual peak Temperature (tp) Ramp-down Rate Time 25°C to peak Temperature (TP) Do not exceed Wave Soldering Parameters °C 20 – 40 seconds 5°C/second max. 8 minutes max. 260°C Temperature, 3 seconds max. 449 Series 54 © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/449.html for current information. Surface Mount Fuses NANO2® > Slo-Blo® > 449 Series Product Characteristics Materials Product Marking Operating Temperature Moisture Sensitivity Level Solderability Insulation Resistance (after Opening) Moisture Resistance A (10,000 ohms minimum) Body: Ceramic Terminations: Brand, Amperage Rating -55°C to 125°C Mechanical Shock Thermal Shock Condition B, 5 cycles, -65°C to 125°C, 15 minutes @ each extreme sawtooth wave 6ms duration, 3 Vibration Resistance to Soldering Heat condition B (10 sec at 260°C) Dimensions 6.86 (.270") 3.15 (.124") 2.95 1.96 (.116") (.077") Recommended pad layout 1.45 (.057") 6.10 (.240") F Part Numbering System 0449 001. M R SERIES AMP Code* Refer to Electrical characteristics table QUANTITY Code 2.69 (.106") T 1A 2.69 (.106") PACKAGING Code *Example: 0.375 Amp product is 0449.375MR (1 amp product shown above). Packaging Packaging Option 12mm Tape and Reel Packaging Specification Quantity 1000 Quantity & Packaging Code MR © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/449.html for current information. 55 449 Series 449 Series Salt Spray Condition B (48hrs) Introduction Introduction to Circuit Protection Transientology 56 © 2009 Littelfuse, Inc. Specifications are subject to change without notice.