Surface Mount Fuses Thin Film > 1206 Size > Slo-Blo® > 468 Series 468 Series Fuse Description The 468 Series Time-Lag (Slo-Blo®) SMF is a small (1206 size) thin-film device designed for secondary protection of circuits used in space constrained applications such as hand-held portable electronic devices. Features Agency Approvals Agency Agency File Number Ampere Range E10480 500mA - 3A LR29862 500mA - 3A Opening Time at 25OC 100% 4 hours, Minimum 200% 1 sec., Min.; 120 sec., Max. 300% 0.05 sec., Min.; 1.5 sec., Max 800% 0.0015 sec., Min.; .05 sec., Max. • Package is visually distinct from fastacting version for easy identification. • Product is compatible with lead-free solders and higher temperature profiles. • Top side marking allows visual verification of amperage rating. • Time delay feature withstands high inrush currents and prevents nuisance openings. Electrical Characteristics for Series % of Ampere Rating • Complies with electronic industry environmental standards for lead reduction. Applications Secondary protection for space constrained applications: • Cell phones • DVD players • Battery packs • Hard disk drives. • Digital cameras Electrical Specifications by Item Ampere Rating (A) Amp Code Max Voltage Rating (V) 0.50 .500 63 1.00 001. 63 1.50 01.5 63 2.00 002. 63 2.50 02.5 63 3.00 003. 32 Agency Approvals Nominal Cold Resistance (Ohms) Nominal Melting I2t (A2sec) Nom Voltage Drop (mV) Nom Power Dissipation (W) 0.27000 0.0310 156.77 0.0784 x x 0.08250 0.1270 94.70 0.0947 x x 0.04750 0.2880 82.32 0.1235 x x 35 amperes @63 VAC 50 amperes @63 VDC 0.03240 0.5060 77.27 0.1545 x x 0.02240 1.0110 73.92 0.1848 x x 50 amperes @32 VAC/VDC 0.01950 1.2700 72.95 0.2189 x x Interrupting Rating 50 amperes @63 VAC/VDC 1. Measured at 10% of rated current, 25˚C. 2. Measured at rated voltage. © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/468.html for current information. 37 Revised: October 4, 2011 468 Series 468 Series This series is 100% lead-free and meets the requirements of the RoHS directive. New Halogen-Free 468 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 > 1206 Size > Slo-BloTransientology > 468 Series 2A 2.5A 3A 1A 100 1.5A Average Time Current Curves .5A Temperature Rerating Curve Time in Seconds 10 Note: 1 0.1 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: 0.001 I = (0.75)(0.80)IRAT = (0.60)IRAT 0 1 10 100 Current in Amperes 2.The temperature derating curve represents the nominal conditions. For questions about temperature derating curve, please consult Littelfuse technical support for assistance. Soldering Parameters Reflow Condition - 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) 217°C - Temperature (tL) 60 – 150 seconds 250 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 468 Series °C Critical Zone TL to TP Ramp-up TL TS(max) tL Ramp-down TS(min) 25 Peak Temperature (TP) +0/-5 tP TP Temperature Pre Heat Pb – Free assembly Preheat tS time to peak temperature (t 25ºC to peak) Time 260°C, 10 seconds max. 38 © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/468.html for current information. Surface Mount Fuses Thin Film > 1206 Size > Slo-Blo® > 468 Series Product Characteristics Operating Temperature –55OC to 90OC. Consult temperature rerating curve chart. For operation above 90°C please contact Littelfuse Thermal Shock Withstands 5 cycles of – 50OC to 125OC Humidity MIL-STD-202F, Method 103B, Condition D Dimensions Vibration Withstands 10-55 Hz per MIL-STD202F, Method 201A and 10-2000 Hz at 20 G’s per MIL-STD202F, Method 204D, Condition D Insulation Resistance (After Opening) Greater than 10,000 ohms. Resistance to Soldering Heat MIL-STD-202G, Method 210F, Condition D Part Marking System MARKING CODE VARIES WITH AMPERAGE RATING (SEE CHART) Amp Code .66 (.026") .58 (.023") 1.27 (.050") 1.52 (.060") Marking Code .500 TF 001. TH 01.5 TK 002. TN 02.5 TO 003. TP Coating Part Numbering System 3.18 (.125") 0468002.NRHF 1.65 (.065") 1.52 (.060") 468 Series Materials Body: Epoxy Substrate Terminations: 100% Tin over Nickel over Copper Element Cover Coat: Conformal Coating 4.83 (.190") 2.03 (.080") WAVE SOLDER SERIES 3.81 (.150") 1.52 (.060") 1.14 (.045") Amp Code The dot is poisitioned before the Packaging Suffix with whole ratings and within the numbering sequence for fractional ratings. Refer to Amp Code column in the Electrical Specifications table. 2.03 (.080") INFARED SOLDER packaging code Example: 1.5 amp product is 046801.5NRHF (2 amp product shown above). NR = Tape and Reel, 5000 pcs ‘hf’ suffix halogen free item Packaging Packaging Option Packaging Specification Quantity Quantity & Packaging Code Tape & Reel – 8mm tape EIA-481 Rev. D (IEC 60286, part 3) 5000 NR © 2009 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/468.html for current information. 39 468 Series