Surface Mount Fuses Thin Film > 0402 Size > Very Fast-Acting > 435 Series 435 Series Fuse Description The 435 Series are fast-acting surface mount thin-film fuses. Their ultra-small size (0402 size) makes them ideal for secondary protection of circuits used in space constrained applications such as hand-held portable electronic devices. Features • 35A interrupt rating at 32VDC Agency Approvals Agency Agency File Number Ampere Range E10480 0.250 - 5.0A LR 29862 0.250 - 5.0A • Small size with current ratings of 0.25 to 5.0 amperes • RoHS compliant, leadfree and halogen-free Electrical Characteristics for Series • Maximum protection of sensitive circuits as fuses are designed to open consistently in <5sec at 200% overload. • Enhanced Breaking Capacity, High l2t Applications % of Ampere Rating Ampere Rating Opening Time at 25OC 100% 0.250A - 5A 4 hours, Minimum 200% 0.375A - 5A 5 secs., Maximum 300% 0.250A 5 secs., Maximum 300% 0.375A - 5A 0.2 sec., Maximum Secondary protection for space constrained applications such as: • Cell phones • DVD players • Battery packs • Hard disk drives. • Digital cameras Electrical Specifications by Item Ampere Rating (A) Amp Code Max Voltage Rating (V) Interrupting Rating Nominal Cold Resistance (Ohms) Nominal Melting I2t (A2sec) Nom Voltage Drop (mV) Agency Approvals Nom Power Dissipation (W) 0.250 .250 32 0.2265 0.0025 60.67 0.01517 x x 0.375 .375 32 0.1930 0.0035 84.64 0.03174 x x 0.500 .500 32 0.1600 0.0053 93.35 0.04668 x x 0.750 .750 32 0.1050 0.0120 101.84 0.07638 x x 1.00 001. 32 0.0730 0.0200 87.45 0.08745 x x 1.25 1.25 32 0.0600 0.0350 96.37 0.12046 x x 1.50 01.5 32 0.0470 0.0560 86.70 0.13005 x x 1.75 1.75 32 0.0390 0.0750 81.13 0.14198 x x 2.00 002. 32 0.0300 0.1000 70.62 55.25 60.58 57.84 57.00 52.44 0.14120 0.13813 0.18740 0.20244 0.22800 0.26220 x x x x x x x x x x x x 35A @32V DC 2.50 02.5 32 0.0185 0.1560 3.00 003. 32 0.0165 0.2032 3.50 03.5 32 0.0135 0.3017 4.00 004. 32 0.0115 0.3084 5.00 005. 32 0.0085 0.5310 1. Measured at 10% of rated current, 25ºC. 2.Measured at rated voltage. © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/435.html for current information. 45 Revised: Jun 16, 2011 435 Series 435 Series This series is 100% lead-free and meet the requirements of the RoHS directive. New Halogen-Free 435 Series fuses are available–to order use the “HF” suffix. See Part Numbering section for additional information. Mount Fuses IntroductionSurface to Circuit Protection Thin Film > 0402 Size > Very Fast-ActingTransientology > 435 Series 3A 3.5A 4A 5A .5A 1A 1.25A 1.5A 1.75A 2A 2.5A 100 .75A .25A Average Time Current Curves .375A Temperature Rerating Curve 10 TIME IN SECONDS 1 0.1 Note: 0.01 1. Derating 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)IRAT = (0.60)IRAT 0.001 0.1 1.0 2.The temperature derating curve represents the nominal conditions. For questions about temperature derating curve, please consult Littelfuse technical support for assistance. 10.0 100.0 CURRENT IN AMPERES Soldering Parameters Pb – Free assembly Pre Heat - Temperature Min (Ts(min)) 150°C - Temperature Max (Ts(max)) 200°C - Time (Min to Max) (ts) 60 – 120 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) 217°C - Temperature (tL) 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 Wave Soldering 435 Series tP TP Critical Zone TL to TP Ramp-up TL TS(max) Temperature Reflow Condition tL Ramp-down TS(min) 25 Preheat tS time to peak temperature (t 25ºC to peak) Time 260°C, 10 seconds max. 46 © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/435.html for current information. Surface Mount Fuses Thin Film > 0402 Size > Very Fast-Acting > 435 Series Product Characteristics Materials Body: Epoxy / Glass Substrate; Parts with ‘HF’ suffix: Halogen Free Epoxy / Glass Terminations: 100% Tin over Nickel over Copper Device Weight: 0.316mg Terminal Strength MIL-STD-202F, Method 211A, Test Condition A Insulation Resistance After Opening: Greater than 10,000Ohms Operating Temperature –55°C to 90°C. Consult temperature rerating curve chart. For operation above 90°C please contact Littelfuse. Thermal Shock Withstands 5 cycles of –55°C to 125°C Vibration MIL-STD-202F Marking code varies with amperage. Refer to Part Marking System chart. A .991 +/- .051 (.039" +/- .002") B Amp Code Marking Code .250 X 435 Series Part Marking System Dimensions .375 .508 +/- .051 (.020" +/- .002") .500 .750 001. .229 +/- .102 (.009" +/- .004") 0.330 +/- .102 (.013" +/- .004") C 1.25 0.292 +/- .102 (.012" +/- .004") 01.5 D .2159 +/- .0889 1.75 (.0085" +/- .0035") Sn Reflow solder recommended mounting pad dimensions Cu 002. 02.5 003. .584 (.023") 03.5 .381 1.55 (.015") (.061") 004. 005. .558 (.022") Part Numbering System A B C D inch min 0.037 0.018 0.008 0.005 inch max 0.041 0.022 0.016 0.012 mm min 0.94 0.457 0.190 0.127 mm max 1.04 0.559 0.394 0.305 0435 002. K R HF S SERIES Amp Code Refer to Amp Code column in the Electrical Specifications table. The dot is positioned at the end of the number sequence with whole ratings and within for fractional ratings. Example: 1.5 amp product is 043501.5KRHF (2 amp product shown) Quantity code K = 10,000 Pieces packaging code R = Tape and Reel halogen free item “S” - for .250A only Packaging Packaging Option Packaging Specification Quantity Quantity & Packaging Code 8mm Tape and Reel EIA-481 Rev. D (IEC 60286, part 3) 10000 KR © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/435.html for current information. 47 435 Series