Surface Mount Fuses Ceramic Fuse > 440 Series 2 RoHS Pb 440 Series, 1206 High I t Fuse Description The 440 Series is a 100% Lead-free, RoHS compliant and Halogen-free fuse series designed specifically to provide over-current protection to circuits that operate under high working ambient temperatures up to 150C and high inrush currents. The general design ensures excellent temperature 2 stability and performance reliability. This high I t fuse series is designed to have ultra high inrush current withstand capability to avoid nuisance fuse open. Features Operating Temperature Suitable for both leaded from -55C to +150C and lead-free reflow / wave soldering 100% Lead-free, RoHS 2 compliant and Halogen-free Ultra high I t values Agency Approvals Applications AGENCY AGENCY FILE NUMBER AMPERE RANGE LCD Displays Scanners E10480 0.25A - 8A Servers Data Modems 29862 0.25A - 8A Notebook Computers Hard Disk Drives Printers Electrical Characteristics for Series Additional Information % of Ampere Ampere Rating Opening Time at 25C Rating 100% 0.25A - 8A 4 hours, Minimum 350% 0.25A - 8A 5 secs., Maximum Datasheet Resources Samples Electrical Specifications by Item Agency Approvals Ampere Max. Nominal Nominal Nominal Voltage Nominal Power Amp Interrupting Rating 2 Rating Voltage Resistance Melting I t Drop At Rated Dissipation At 1 Code (AC/DC) 2 2 3 4 (A) Rating (V) (Ohms) (A Sec.) Current (V) Rated Current (W) 0.250 .250 125 2.140 0.00649 0.5260 0.132 x X 50 A 125 V AC/DC 0.375 .375 125 1.216 0.01455 0.4993 0.187 x X 0.500 .500 63 50 A 63 V AC/DC 0.8140 0.02642 0.4831 0.242 x X 0.750 .750 63 50 A 63 V AC/DC 0.4624 0.09312 0.3983 0.299 x X 1.00 001. 50 0.3096 0.21054 0.3457 0.346 x X 50 A 50 V DC 1.25 1.25 50 0.2265 0.379 0.3240 0.405 x X 50 A 50 V AC 1.50 01.5 50 0.1759 0.50652 0.3215 0.482 x X 1.75 1.75 32 0.0450 0.3312 0.0777 0.136 x X 2.00 002. 32 0.0385 0.4326 0.0792 0.158 x X 2.50 02.5 32 0.02850 0.8191 0.0747 0.187 x X 3.00 003. 32 0.02252 1.232 0.0742 0.223 x X 3.50 03.5 32 50 A 32 V AC/DC 0.01845 1.789 0.0757 0.265 x X 4.00 004. 32 0.01553 2.601 0.0709 0.284 x X 5.00 005. 32 0.0120 4.761 0.0654 0.327 x X 7.00 007. 32 0.00753 8.464 0.0696 0.487 x X 8.00 008. 32 0.00634 12.95 0.0655 0.524 x X Notes: 1. AC Interrupting Rating tested at rated voltage with unity power factor. DC Interrupting Devices designed to carry rated current for 4 hours minimum. It is recommended that Rating tested at rated voltage with time constant < 0.8 msec. devices be operated continuously at no more than 80% rated current. See Temperature Derating Curvefor additional derating information. 2. Nominal Resistance measured with < 10% rated current. Devices designed to be mounted with marking code facing up. 3. Contact Littelfuse if application transient surges are less than 1 ms. 4. Nominal Voltage Drop measured at rated current after temperature has stabilized. 2018 Littelfuse, Inc. Specifications are subject to change without notice. Application testing is strongly recommended. Revised: 12/13/18 Surface Mount Fuses Ceramic Fuse > 440 Series Temperature Rerating Curve Average Time Current Curves 140 100 120 100 10 80 60 1 40 -65 -45 -25 -5 15 35 55 75 95 115 135 155 TEMPERATURE (C) 0.1 Note: 1. Rerating depicted in this curve is in addition to the standard derating of 20% for continuous operation. 0.01 Example: For continuous operation at 75 degrees celsius, the fuse should be derated as follows: I = (0.80)(0.85)I = (0.68)I RAT RAT 0.001 0.1 1.0 10.0 100.0 1000. CURRENT IN AMPERES Soldering Parameters t P Reflow Condition Pb-free assembly T P Critical Zone Ramp-up T to T L P - Temperature Min (T ) 150C s(min) T L Pre Heat - Temperature Max (T ) 200C t s(max) L T S(max) - Time (Min to Max) (t ) 60 180 seconds s Ramp-down Average Ramp-Up Rate (Liquidus Temp Preheat 3C/second max. (T ) to peak) T L S(min) t S T to T - Ramp-up Rate 5C/second max. S(max) L - Temperature (T ) (Liquidus) 217C L 25 Reflow time to peak temperature - Temperature (t ) 60 150 seconds L Time (t 25C to peak) +0/-5 Peak Temperature (T ) 260 C P Time within 5C of actual peak 10 30 seconds Temperature (t ) p Ramp-down Rate 6C/second max. Time 25C to peak Temperature (T ) 8 minutes max. P Do not exceed 260C Wave Soldering 260C, 10 seconds max. 2018 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/13/18 PERCENT OF RATING TIME IN SECONDS Temperature