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| Surface Mount Fuses Ceramic Fuse > 440 Series 440 Series, 1206 High I2t 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 stability and performance reliability. Agency Approvals AGENCY AGENCY FILE NUMBER E10480 Pending AMPERE RANGE 1.75A - 8A 1.75A - 8A Features from -55C to +150C compliant and Halogenfree Applications and lead-free reflow / wave soldering 2 t values Electrical Characteristics for Series % of Ampere Rating 100% 350% Ampere Rating 1.75A - 8A 1.75A - 8A Opening Time at 25C 4 hours, Minimum 5 secs., Maximum Electrical Specifications by Item Ampere Rating (A) 1.75 2 2.5 3 3.5 4 5 7 8 Amp Code 1.75 002. 02.5 003. 03.5 004. 005. 007 . 008. Max. Voltage Rating (V) 32 32 32 32 32 32 32 32 32 50 A @ 32 V AC/DC Nominal Nominal Nominal Voltage Nominal Power Agency Approvals Interrupting Rating Resistance Melting I2t Drop At Rated Dissipation At 1 (AC/DC) (Ohms)2 (A2Sec.)3 Current (V)4 Rated Current (W) 0.04121 0.03582 0.026706 0.022 0.01877 0.01515 0.01119 0.00794 0.00646 0.3312 0.4326 0.8191 1.232 1.789 2.601 4.761 8.464 12.95 0.07769 0.07921 0.0747 0.7418 0.07566 0.07088 0.06544 0.06963 0.065526 0.136 0.158 0.187 0.223 0.265 0.284 0.327 0.487 0.524 x x x x x x x x x x x x x x x x x x Notes: 1. AC Interrupting Rating tested at rated voltage with unity power factor. DC Interrupting Rating tested at rated voltage with time constant < 0.8 msec. 2. Nominal Resistance measured with < 10% rated current. 3. Nominal Melting It measured at 1 msec. opening time. 4. Nominal Voltage Drop measured at rated current after temperature has stabilized. Devices designed to carry rated current for 4 hours minimum. It is recommended that devices be operated continuously at no more than 80% rated current. See "Temperature Derating Curve"for additional derating information. Devices designed to be mounted with marking code facing up. (c) 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/440.html for current information. Revised: September 17, 2009 440 Series 440 Series This high I2t fuse series is designed to have ultra high inrush current withstand capability to avoid nuisance fuse open. Surface Mount Fuses Introduction to Circuit Protection Transientology Ceramic Fuse > 440 Series Temperature Derating Curve Average Time Current Curves 1.75A 2A 2.5A 3A 3.5A 4A 5A 7A 8A 140 PERCENT OF RATING 120 100 10 80 60 1 TIME IN SECONDS 40 -65 -45 -25 -5 15 35 55 75 95 115 135 155 TEMPERATURE (C) 0.1 Note: 1. Derating depicted in this curve is in addition to the standard derating of 20% for continuous operation. For continuous operation at 75 degrees celsius, the fuse should be derated as follows: I = (0.80)(0.85)IRAT = (0.68)IRAT 0.01 0.001 1 10 100 CURRENT IN AMPERES 1000 Soldering Parameters Reflow Condition - Temperature Min (Ts(min)) Pre Heat - Temperature Max (Ts(max)) - Time (Min to Max) (ts) Average Ramp-Up Rate (Liquidus Temp (TL) to peak) TS(max) to TL - Ramp-up Rate Reflow - Temperature (TL) (Liquidus) - Temperature (tL) 150C 60 - 180 seconds 3C/second max. 5C/second max. 217C 60 - 150 seconds 260+0/-5 C 10 - 30 seconds 6C/second max. 8 minutes max. 260C TP Ramp-up tP Critical Zone TL to TP Temperature 200C TL TS(max) Preheat tL Ramp-down TS(min) tS 25 time to peak temperature (t 25C to peak) Time Peak Temperature (TP) Time within 5C of actual peak Temperature (tp) Ramp-down Rate Time 25C to peak Temperature (TP) Do not exceed Wave Soldering 260C, 10 seconds max. 440 Series (c) 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/440.html for current information. Surface Mount Fuses Ceramic Fuse > 440 Series Product Characteristics Body: Advanced Ceramic Terminations: Ag / Ni / Sn (100% Lead-free) Element Cover Coating: Lead-free Glass Moisture Resistance Thermal Shock Mechanical Shock Vibration Vibration, High Frequency Dissolution of Metallization Terminal Strength MIL -STD-202, Method 106G MIL -STD-202, Method 107G, Materials Moisture Sensitivity Level Solderability Humidity Test ESD Immunity Resistance to Solder Heat Condition A MIL -STD-202, Method 201A MIL -STD-202, Method 204D, Condition D Condition D Dimensions 3.200 .1778 [.126 .007] Part Marking System Amp Code 1.75 002. 02.5 1.000 [.039] 1.63 + .10/ -.20 [.064 + .004/ -.008] Marking Code L N O P R S T W X X 003. 03.5 004. 005. 007 . 008. .8179 +.046/ -.076 [.0322 +.0018/ -.003] TERMINATION Part Numbering System 0440 008. W R 0.520 .200 [.020 .008] SERIES AMP CODE 1.000 [.039] 1.500 [.059] 1.800 [.071] QUANTITY CODE W = 3000 pcs 3.500 [.138] PACKING CODE Packaging Packaging Option 8mm Tape and Reel Packaging Specification Quantity 3000 Quantity & Packaging Code WR (c) 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/440.html for current information. 440 Series 440 Series Introduction to Circuit Protection Transientology (c) 2009 Littelfuse, Inc. Specifications are subject to change without notice. |
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