Surface Mount Fuses Thin Film > 0402 Size > Very Fast-Acting > 435 Series 435 Series 0402 Fast-Acting Fuse RoHS Pb 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. 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. Features Agency Approvals • 35A interrupt rating at • Maximum protection of 32VDC sensitive circuits as fuses Agency Agency File Number Ampere Range • Small size with current are designed to open ratings of 0.25 to 5.0 consistently in <5sec at E10480 0.250 - 5.0A amperes 200% overload. 29862 0.250 - 5.0A • RoHS compliant, Lead- • Enhanced Breaking Free and Halogen-Free Capacity, High l2t Electrical Characteristics for Series Applications Secondary protection for space constrained applications % of Ampere Rating Ampere Rating Opening Time at 25OC such as: 100% 0.250A - 5A 4 hours, Minimum • Cell phones • DVD players 200% 0.375A - 5A 5 secs., Maximum • Battery packs • Hard disk drives. 300% 0.250A 5 secs., Maximum • Digital cameras 300% 0.375A - 5A 0.2 sec., Maximum Additional Information Datasheet Resources Samples Electrical Specifications by Item Ampere Max Voltage Nominal Cold Nominal Nom Nom Power Agency Approvals Interrupting Rating Amp Code Rating Resistance Melting Voltage Drop Dissipation Rating (A) (V) (Ohms) I2t (A2sec) (mV) (W) 0.250 .250 32 0.36001 0.0025 92.49 0.0231 x x 0.375 .375 32 0.19301 0.0035 84.64 0.03174 x x 0.500 .500 32 0.16001 0.0053 93.35 0.04668 x x 0.750 .750 32 0.10501 0.0120 101.84 0.07638 x x 1.00 001. 32 0.07301 0.0200 87.45 0.08745 x x 1.25 1.25 32 0.06001 0.0350 96.37 0.12046 x x 1.50 01.5 32 0.04701 0.0560 86.70 0.13005 x x 50A @32VDC2 1.75 1.75 32 0.03901 0.0750 81.13 0.14198 x x 2.00 002. 32 0.03001 0.1000 70.62 0.14120 x x 2.50 02.5 32 0.02001 0.1560 55.25 0.13813 x x 3.00 003. 32 0.01701 0.2032 60.58 0.18740 x x 3.50 03.5 32 0.01501 0.3017 57.84 0.20244 x x 4.00 004. 32 0.01051 0.3084 57.00 0.22800 x x 5.00 005. 32 0.00851 0.5310 52.44 0.26220 x x 1. Measured at 10% of rated current, 25ºC. 2. Measured at rated voltage. © 2020 Littelfuse, Inc. Specifications are subject to change without notice. ASpppelcicifiactiaotnio tness tainrge issu sbtjreocntg tloy crehcaonmgem wenitdheodu.t notice. Revised: 02/20/20

Surface Mount Fuses Thin Film > 0402 Size > Very Fast-Acting > 435 Series Temperature Re-rating Curve Average Time Current Curves 100 .25A .375A .5A .75A 1A 1.25A 1.5A 1.75A 2A 2.5A 3A 3.5A 4A 5A 10 S 1 D N O C E S N E I M TI 0.1 Note: 1. Rerating 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)I = (0.60)I 0.01 RAT RAT 2. The temperature derating curve represents the nominal conditions. For questions about temperature derating curve, please consult Littelfuse technical support for assistance. 0.001 0.1 1.0 10.0 100.0 CURRENT IN AMPERES Soldering Parameters Reflow Condition Pb – Free assembly t - Temperature Min (T ) 150°C P s(min) T Pre Heat - Temperature Max (T ) 200°C P Critical Zone s(max) Ramp-up TL to TP - Time (Min to Max) (t) 60 – 120 secs s T ATSv(mearxa) gtoe TraL m- Rpa umpp r-autpe R(Laitqeuidus Temp (TL) to peak 55°°CC//sseeccoonndd mmaaxx eruTS(maxL) tL - Temperature (T) (Liquidus) 217°C ta Reflow L r Ramp-down - Temperature (t) 60 – 150 seconds e L p Preheat Peak Temperature (T) 250+0/-5 °C mTS(min) Time within 5°C of aPctual peak Temperature (t) 20 – 40 seconds eT tS p Ramp-down Rate 5°C/second max Time 25°C to peak Temperature (T) 8 minutes Max. 25 P time to peak temperature Do not exceed 260°C (t 25ºC to peak) Time Wave Soldering 260°C, 10 seconds max. © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/20/20

Surface Mount Fuses Thin Film > 0402 Size > Very Fast-Acting > 435 Series Product Characteristics Body: Epoxy / Glass Substrate; –55°C to 90°C. Operating Parts with ‘HF’ suffix: Halogen Free Epoxy / Glass Consult temperature re-rating curve chart. Materials Temperature Terminations: 100% Tin over Nickel over Copper For operation above 90°C please contact Littelfuse. Device Weight: 0.316mg Thermal Shock Withstands 5 cycles of –55°C to 125°C Terminal Strength MIL-STD-202, Method 211, Test Condition A Vibration MIL-STD-202, Method 201 Insulation Resistance After Opening: Greater than 10,000Ohms Dimensions Part Marking System A Marking code varies with amperage. .991 +/- .051 Refer to Part Marking Amp Code Marking Code (.039" +/- .002") System chart. 0.250 X B.508 +/- .051 0.375 (.020" +/- .002") 0.500 0.750 .229 +/- .102 001. (.009" +/- .004") 1.25 0.330 +/- .102 C0.292 +/- .102 01.5 (.013" +/- .004") (.012" +/- .004") 1.75 D.2159 +/- .0889 (.0085" +/- .0035") 002. Reflow solder recommended 02.5 Sn Cu mounting pad dimensions 003. .584 03.5 (.023") 004. .381 1.55 005. (.015") (.061") .558 Part Numbering System (.022") 0435 002. K R HF S Unit A B C D Series inch min 0.037 0.018 0.008 0.005 inch max 0.041 0.022 0.016 0.012 Refer to Amp Code column in the Electrical Specifications table. mm min 0.94 0.457 0.190 0.127 The dot is positioned at the end of the number mm max 1.04 0.559 0.394 0.305 sequence with whole ratings and within for fractional ratings. Example: 1.5 amp product is 043501.5KRHF (2 amp product shown) Packaging Quantity Code K = 10,000 Pieces Packaging Packaging Quantity Quantity & Packaging Packaging Code Option Specification Code R = Tape and Reel Halogen Free Item 8mm Tape and EIA-481 Rev. D (IEC Reel 60286, part 3) 10000 KR “S” - for .250A only Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at: www.littelfuse.com/disclaimer-electronics. © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/20/20