Fuse Mounting Accessories Page 42 Fuse & Mounting Accessories

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/03/17 Surface Mount Fuses Thin Film > 1206 Size > Slo-Blo Fuse > 468 Series Average Time Current Curves Temperature Re-rating Curve 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 Soldering Parameters Wave Soldering 260C, 10 seconds max. Note: 1. Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation. Example: For continuous operation at 70 degrees celsius, the fuse should be deratedas follows: I = (0.75)(0.80)I RAT = (0.60)I RAT 2. The temperature derating curve represents the nominal conditions. For questions about temperature derating curve, please consult Littelfuse technical support for assistance. 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 0.001 0.01 0.1 1 10 100 0 0 1 0 1 1 0 Current in Amperes Time in Seconds 3A 2A 2.5A 1A 1.5A .5A

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