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Technical content

Features

  • 50A interrupt rating at 32VDC
  • Small size with current ratings of 0.25 to 5.0 amperes
  • RoHS compliant, Lead- Free and Halogen-Free
  • Enhanced Breaking Capacity, High l2t
  • Maximum protection of sensitive circuits as fuses are designed to open consistently in <5sec at 200% overload.
  • Recognized to UL/CSA/ NMX 248-1 and UL/CSA/ NMX 248-14 % 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 RoHS Pb Ampere Rating (A) Amp Code Max Voltage Rating (V) Interrupting Rating Nominal Cold Resistance (Ohms) Nominal Melting I2t (A2sec) Nom Voltage Drop (mV) Nom Power Dissipation (W) Agency Approvals 0.250 .250 32 50A @32VDC2 0.36001 0.0025 92.49 0.0231 x x Electrical Specifications by Item 1. Measured at 10% of rated current, 25ºC. 2. Measured at rated voltage. 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.

Applications

  • Cell phones
  • Battery packs
  • Digital cameras
  • DVD players
  • Hard disk drives. Secondary protection for space constrained applications such as: Specifications are subject to change without notice. Application testing is strongly recommended. Additional Information Datasheet SamplesResources

© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: BO. 11/13/20 Surface Mount Fuses Thin Film > 0402 Size > Very Fast-Acting > 435 Series Average Time Current Curves 0.001 0.01 0.1 100 0.1 1.0 10.0 100.0 TIME IN SECONDS CURRENT IN AMPERES 1.5A 1.25A 1.75A 2.5A 3.5A .25A .375A .5A .75A Reflow Condition Pb – Free assembly Pre Heat - T emperature Min (Ts(min)) 150°C - T emperature Max (Ts(max)) 200°C - Time (Min to Max) (ts) 60 – 120 secs Average ramp up rate (Liquidus T emp (TL) to peak 5°C/second max TS(max) to TL - Ramp-up Rate 5°C/second max Reflow - T emperature (TL) (Liquidus) 217°C - T emperature (tL) 60 – 150 seconds Peak T emperature (TP) 250+0/-5 °C Time within 5°C of actual peak T emperature (tp) 20 – 40 seconds Ramp-down Rate 5°C/second max Time 25°C to peak T emperature (TP) 8 minutes Max. Do not exceed 260°C Soldering Parameters T emperature Re-rating Curve Wave Soldering 260°C, 10 seconds max. Notes: 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)IRAT = (0.60)IRAT 2. The temperature derating curve represents the nominal conditions. For questions about temperature derating curve, please consult Littelfuse technical support for assistance. Time Temperature TP TL TS(max) TS(min) tP tL tS time to peak temperature (t 25ºC to peak) Ramp-down Ramp-up Preheat Critical Zone TL to TP

© 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: BO. 11/13/20 Surface Mount Fuses Thin Film > 0402 Size > Very Fast-Acting > 435 Series 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) Materials Body: Epoxy / Glass Substrate; Parts with ‘HF’ suffix: Halogen Free Epoxy / Glass T erminations: 100% Tin over Nickel over Copper Device Weight: 0.316mg T erminal Strength MIL -STD-202, Method 211, Test Condition A Insulation Resistance After Opening: Greater than 10,000Ohms Operating Temperature –55°C to 90°C. Consult temperature re-rating curve chart. For operation above 90°C please contact Littelfuse. Thermal Shock Withstands 5 cycles of –55°C to 125°C Vibration MIL -STD-202, Method 201 Product Characteristics .558 (.022") Reflow solder recommended mounting pad dimensions .991 +/- .051 (.039" +/- .002") Marking code varies with amperage. Refer to Part Marking System chart. Cu .508 +/- .051 (.020" +/- .002") .229 +/- .102 (.009" +/- .004") 0.330 +/- .102 (.013" +/- .004") .381 (.015") 1.55 (.061") .584 (.023") 0.292 +/- .102 (.012" +/- .004") .2159 +/- .0889 Sn A B C D Dimensions Packaging Part Numbering System Part Marking System Packaging Option Packaging Specification Quantity Quantity & Packaging Code 8mm Tape and Reel EIA-481 Rev. D (IEC 60286, part 3) 10000 KR Unit 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 Halogen Free Item “S” - for .250A only Packaging Code R = Tape and Reel Quantity Code K = 10,000 Pieces 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. Amp Code Marking Code 0.250 X 0.375 0.500 0.750 0 01. 1 .25 01. 5 1 .75 002. 02.5 003. 03.5 004. 005.