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  • Manufacturer or author: Provided By digicamel.com
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Technical content

Features

% of Ampere Rating Opening Time 100% 4 hours, Minimum 0% 1 sec., Min.; 60 sec., Max. 300% 0.2 sec., Min.; 3 sec., Max Electrical Specifications by Item Ampere Rating (A) Amp Code Max Voltage Rating (V) Interrupting Rating Nominal Cold Resistance (Ohms) Nominal Melting I2t (A2sec) Agency Approvals 0.375 .375 125 50 amperes @125 VAC/ VDC PSE: 100 amperes @100 VAC 1 .5130 0.088 x 0.500 .500 125 0.7633 0.258 x 0.750 .750 125 0.4080 0.847 x 1 .00 001 . 125 0.2516 1 .76 x x 1 .50 01 .5 125 0.1186 4.70 x x 2.00 002. 125 0.0708 6.76 x x 2.50 02.5 125 0.0400 13.18 x x 3.00 003. 125 0.0352 19.55 x x 3.50 03.5 125 0.0261 32.70 x x 4.00 004. 125 0.0227 40.80 x x 5.00 005. 125 0.0171 59.59 x x

Applications

t /PUFCPPL1$ t -$%1%157 t -$%NPOJUPS t -$%1%1QBOFM t -$%CBDLMJHIUJOWFSUFS t 1PSUBCMF%7%QMBZFS t 1PXFSTVQQMZ t /FUXPSLJOH t 1$TFSWFS t $PPMJOHGBOTZTUFN t 4UPSBHFTZTUFN t 5FMFDPNTZTUFN t 8JSFMFTTCBTFTUBUJPO t 8IJUFHPPET t (BNFDPOTPMF t 0GmDF"VUPNBUJPO equipment t #BUUFSZDIBSHJOHDJSDVJU protection t *OEVTUSJBMFRVJQNFOU t .FEJDBMFRVJQNFOU t"VUPNPUJWF Secondary protection for space constrained applications: t -FBEGSFFBOE)BMPHFO Free t 4MP#MP t 4NBMMTJ[F t 8JEFSBOHFPGDVSSFOU ratings available t 8JEFPQFSBUJOH temperature range t -PXUFNQFSBUVSF de-rating PS E PS E Notes: - l2t calculated at 8ms. Resistance is measured at 10% of rated current, 25ºC Revised: June 3, 2012

Introduction to Circuit ProtectionIntroduction to Circuit Protection Transientology © 2012 Littelfuse, Inc. Specifications are subject to change without notice. Surface Mount Fuses

449 Series

NANO2® > Slo-Blo® > 449 Series Please refer to www.littelfuse.com/series/449.html for current information. Reflow Condition 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 3°C/second max. TS(max) to TL - Ramp-up Rate 3°C/second max. Reflow - Temperature (TL) (Liquidus) 217°C - Temperature (tL) 60 – 90 seconds Peak Temperature (TP) 250+0/-5 °C Time within 5°C of actual peak Temperature (t p) 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 Soldering Parameters Average Time Current CurvesT emperature Rerating Curve TIME IN SECONDS CURRENT IN AMPERES 0.01 0.1 100 1000 0 1 10 100 1.5A .750A .500A .375A 2.5A 3.5A Note: 1 . Derating depicted in this curve is in addition to the standard derating of 25% for continuous operation. Wave Soldering Parameters ¡$1FBL Temperature, 3 seconds max. 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

© 2012 Littelfuse, Inc. Specifications are subject to change without notice. Surface Mount Fuses NANO2® > Slo-Blo® > 449 Series Please refer to www.littelfuse.com/series/449.html for current information. T 6.86 (.270") 3.15 (.124") 2.95 (.116")1.96 (.077") 2.69 (.106") 2.69 (.106") 1.45 (.057") 6.10 (.240") Recommended pad layout F Materials Body: Ceramic T erminations:(PMEQMBUFE$BQT Product Marking Brand, Amperage Rating Operating T emperature -55°C to 125°C Moisture Sensitivity Level -FWFM +45%$ Solderability .*-45% .FUIPE Insulation Resistance (after Opening) .*-45% .FUIPE 5FTU$POEJUJPO A (10,000 ohms minimum) Thermal Shock .*-45% .FUIPE 5FTU Condition B, 5 cycles, -65°C to 125°C, 15 minutes @ each extreme Mechanical Shock .*-45% .FUIPE 5FTU* %FFOFSHJ[FE(TQLBNQMJUVEF sawtooth wave 6ms duration, 3 DZDMFT9:; YZ[ TIPDLT Vibration .*-45% .FUIPE BNQMJUVEF )[JONJOIST FBDI9:; IST Moisture Resistance .*-45% .FUIPE DZDMFT Salt Spray .*-45% .FUIPE 5FTU Condition B (48hrs) Resistance to Soldering Heat .*-45% .FUIPE 5FTU condition B (10 sec at 260°C) Product Characteristics Dimensions Packaging Part Numbering System Packaging Option Packaging Specification Quantity Quantity & Packaging Code QBSU 1000 MR 0449 001. M R SERIES AMP Code* QUANTITY Code PACKAGING Code Refer to Electrical charac- teristics table QDT 5BQFBOE3FFM *Example: 0.375 Amp product is 0449.375MR (1 amp product shown above).