Surface Mount Fuses Thin Film > 0603 Size > Very Fast Acting > 434 Series 434 Series Fuse ® ® Description The 434 series fast-acting surface mount fuse series is an ultra small (0603 size) thin-film device designed for secondary protection of circuits used in space constrained applications such as hand-held portable electronic devices. For RoHS compliant and lead-free design, please refer to the Littelfuse 467 series thin film fuse. Features Agency Approvals Agency ® ® Agency File Number Ampere Range E10480 250mA - 3A LR29862 250mA - 3A Applications Secondary protection for space constrained applications such as: Electrical Characteristics for Series % of Ampere Rating Opening Time at 25OC 100% 4 hours, Minimum 200% 5 seconds, Maximum. 300% 0.2 seconds, Maximum t 5IFMPXFSIFJHIUQSPmMF produces a flat surface for improved performance in pick-and-place operations and an alternate solution for height critical applications. t 5IF4MJN-JOF fuse is an extremely small, low profile design (0603 chip size) utilizing thin-film technology to achieve precise control of electrical characteristics. t $FMMQIPOFT t %7%QMBZFST t #BUUFSZQBDLT t )BSEEJTLESJWFT t %JHJUBMDBNFSBT Electrical Specifications by Item Ampere Rating (A) Amp Code 0.250 0.375 0.500 0.680 0.750 1.00 1.25 1.50 1.75 2.00 2.50 3.00 3.50 4.00 5.00 .250 .375 .500 .680 .750 001. 1.25 01.5 1.75 002. 02.5 003. 03.5 004. 005. Max Voltage Rating (V) 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 Interrupting Rating 50A @32 V AC/DC 35A @32 V AC/DC Nominal Cold Resistance (Ohms) Nominal Melting I2t (A2sec) 0.3750 0.2650 0.1903 0.1250 0.1140 0.0720 0.0540 0.0480 0.0390 0.0360 0.0280 0.0230 0.0190 0.0170 0.0130 0.0030 0.0053 0.0087 0.0109 0.0171 0.0212 0.0320 0.0526 0.0661 0.1040 0.1750 0.1980 0.2650 0.3520 1.2970 Agency Approvals ® ® x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x 1. Measured at 10% of rated current, 25ºC. 2. Measured at rated voltage. ©2008 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com for the most current information 31 Revision: February 13, 2008 434 Series Surface Mount Fuses Thin Film > 0603 Size > Very Fast Acting > 434 Series Average Time Current Curves .25A .375A .5A .68A .75A 1A 1.5A 2A 2.5A 3A 3.5A 4A 5A Temperature Rerating Curve 100 TIME IN SECONDS 10 1 0.1 0.01 0.001 0.1 1 10 CURRENT IN AMPERES 100 Soldering Parameters - Wave Soldering Reflow Condition Pre Heat Pb – Free assembly - Temperature Min (Ts(min)) 150°C - Temperature Max (Ts(max)) 200°C - Time (Min to Max) (ts) 60 – 180 secs Average ramp up rate (Liquidus Temp (TL) to peak 5°C/second max TS(max) to TL - Ramp-up Rate 5°C/second max Reflow - Temperature (TL) (Liquidus) - Temperature (tL) 217°C 60 – 150 seconds Peak Temperature (TP) 250+0/-5 °C Time within 5°C of actual peak Temperature (tp) 20 – 40 seconds Ramp-down Rate 5°C/second max Time 25°C to peak Temperature (TP) 8 minutes Max. Do not exceed 260°C 434 Series 32 Revision: February 13, 2008 ©2008 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com for the most current information Surface Mount Fuses Thin Film > 0603 Size > Very Fast Acting > 434 Series Product Characteristics Materials Body: Epoxy Substrate Terminations: 100% Tin over Nickel over Copper Element Cover Coat: Conformal Coating Operating Temperature – 55OC to 90OC. Consult temperature rerating curve chart. For operation above 90°C contact Littelfuse. Humidity MIL-STD-202F Method 103B Condition D Thermal Shock Withstands 5 cycles of – 55OC to 125OC Vibration Per MIL-STD-202F Insulation Resistance (After Opening) Resistance to Soldering Heat Dimensions .305 (.012") .254 (.010") Sn/Pb Coating .279 (.011") MARKING CODE VARIES WITH AMPERAGE RATING (SEE CHART) Sn/Pb Sn/Pb .813 (.032") 1.09 (.043") 1.02 (.040") Withstands 60 seconds above 200OC and up to 260OC, maximum Part Marking 1.60 (.063") .127 (.005") Cu Greater than 10,000 ohms 3.20 (.126") 1.09 (.043") WAVE SOLDER 2.54 (.100") 1.02 (.040") .762 (.030") 1.09 (.043") Amp Code Marking Code .250 D .375 E .500 F .680 X .750 G 001. H 1.25 J 01.5 K 1.75 L 002. N 02.5 O 003. P 03.5 R 004. S 005. T REFLOW SOLDER Part Numbering System 0434 1.75 NR SERIES QUANTITY CODE AMP CODE Packaging Packaging Option Packaging Specification Quantity Quantity & Packaging Code 8mm Tape and Reel EIA RS-481-2 (IEC 286, part 3) 5000 NR ©2008 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com for the most current information 33 Revision: February 13, 2008 434 Series