Fuse Mounting Accessories Page 58 Fuse & Mounting Accessories

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/03/17 Surface Mount Fuses NANO 2 > Slo-Blo Fuse > 449 Series Reflow Condition Pb - Free assembly Pre Heat - Temperature Min (T s(min) ) 150C - Temperature Max (T s(max) ) 200C - Time (Min to Max) (t s ) 60 - 120 secs Average ramp up rate (Liquidus Temp (T L ) to peak 3C/second max. T S(max) to T L - Ramp-up Rate 3C/second max. Reflow - Temperature (T L ) (Liquidus) 217C - Temperature (t L ) 60 - 90 seconds Peak Temperature (T P ) 260 +0/-5 C Time within 5C of actual peak Temperature (t p ) 20 - 40 seconds Ramp-down Rate 5C/second max. Time 25C to peak Temperature (T P ) 8 minutes max. Do not exceed 260C Soldering Parameters Average Time Current Curves Temperature Re-rating Curve TIME IN SECONDS CURRENT IN AMPERES 0.01 0.1 1 10 100 1000 0 1 10 100 3A 4A 5A 1.5A 1A .750A .500A .375A 2.5A 2A 3.5A Note: 1. Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation. Wave Soldering Parameters 260C Peak Temperature, 3 seconds max. Time Temperature T P T L T S(max) T S(min) 25 t P t L t S time to peak temperature (t 25C to peak) Ramp-down Ramp-up Preheat Critical Zone T L to T P

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