Fuse Mounting Accessories Page 62 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 > 451/453 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 Soldering Parameters Temperature Re-rating Curve 0.001 0.01 0.1 1 10 100 0.01 0.1 1 10 100 1000 10000 TIME IN SECONDS CURRENT IN AMPS 8A 10A 12A 5A 6.3A 7A 15A 3.5A 3.15A 3A 4A 2.5A 2A 1.5A 1.25A 1A 800mA 750mA 630mA 500mA 375mA 400mA 315mA 250mA 200mA 100mA 125mA 160mA 80mA 62mA 1.6A 20A 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, 10 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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