Fuse Mounting Accessories Page 55 Fuse & Mounting Accessories

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/03/17 Surface Mount Fuses NANO 2 Fuse > Very Fast-Acting > 448 Series Average Time Current Curves 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 5C/second max. T S(max) to T L - Ramp-up Rate 5C/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 Wave Soldering Parameters 260C Peak Temperature, 10 seconds max. Soldering Parameters Temperature Re-rating Curve 0.001 0.01 0.1 1 10 100 0 0 0 1 0 0 1 0 1 1 1 . 0 CURRENT IN AMPS TIME IN SECONDS .062 A .080 A .100 A .125 A .160 A .200 A .250 A .315 A .375 A .40 A .50 A .63 A .75 A .80 A 1.00 A 1.25 A 1.50 A 1.60 A 2.00 A 2.50 A 3.00 A 3.15 A 3.50 A 4.00 A 5.00 A 6.30 A 7 A 8 A 10 A 12 A 15 A Note: 1. Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation. 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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