Fuse Mounting Accessories Page 68 Fuse & Mounting Accessories

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/03/17 Surface Mount Fuses NANO 2 > Very Fast Acting Fuse > 456 Series Average Time Current Curves Temperature Re-rating Curve PERCENT OF UPRATING PERCENT OF DOWNUPRATING AMBIENT TEMPERATURE 248F 212F 176F 140F 104F 68F 32F -4F -40F -76F 120C 264F 140C 100C 80C 60C 40C 20C 0C -20C -40C -60C 0 20 40 60 20 40 60 Soldering Parameters - Reflow Soldering 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 - 180 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 - 150 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 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 0.01 0.1 1 10 100 1 10 100 1000 TIME IN SECONDS CURRENT IN AMPS 40A 30A 20A 25A 1000 Note: 1. Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation.

Previous Page
Next Page