Fuse Mounting Accessories Page 36 Fuse & Mounting Accessories

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 03/03/17 Surface Mount Fuses Thin Film > 1206 Size > Very Fast-Acting > 466 Series Average Time Current Curves TIME IN SECONDS CURRENT IN AMPERES 0.01 0.1 1 10 100 10 100 0.001 4A 3A 2 1/2A 2A 1 3/4A 1 1/2A 1 1/4A 1A 3/4A 1/2A 3/8A 1/4A 1/8A 5A 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 seconds 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 Temperature Re-rating Curve Wave Soldering 260C, 10 seconds max. Note: 1. Re-rating depicted in this curve is in addition to the standard re-rating of 25% for continuous operation. Example: For continuous operation at 70 degrees celsius, the fuse should be rerated as 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

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