Cartridge, Axial Lead, and Socket Fuses PICO(R) II > Very Fast-Acting > 251/253 Series 251/253 Series, RoHS PICO(R) II, Very Fast-Acting Fuse PS E (R) (R) TUV Description The PICO(R) II very fast-acting fuse is designed to meet an extensive array of performance characteristics in a space-saving subminiature package. Features t 7FSZGBTUBDUJOH t 3P)4DPNQMJBOU t 4NBMMTJ[F t 8JEFPQFSBUJOH temperature range t 8JEFDVSSFOUSBUJOHSBOHF t -PXUFNQFSBUVSFEFSBUJOH (62mA- 15A) Applications Agency Approvals Agency Agency File Number (R) (R) PS E Ampere Range E10480 62mA - 15A LR 29862 62mA - 15A JET 1896-31007-1001 TUV Secondary protection for space constrained applications J02037794 1A - 5A 500mA - 10A t 'MBU1BOFM%JTQMBZ57 t 1PXFSTVQQMZ t -$%NPOJUPS t "VEJP7JEFPTZTUFN t -$%CBDLMJHIUJOWFSUFS t -JHIUJOHTZTUFN t 0GmDFNBDIJOFT t .FEJDBMFRVJQNFOU Electrical Characteristics % of Ampere Rating Ampere Rating Opening Time 100% 1/16-15 4 hours, Minimum 1/16-7 1 sec., Maximum 200% 10 3 sec., Maximum 12-15 10 sec., Maximum Electrical Characteristics Ampere Rating (A) Amp Code 1/16 1/8 1/4 3/8 1/2 3/4 1 11/4 11/2 2 21/2 3 31/2 4 5 7 10 12 15 .062 .125 .250 .375 .500 .750 001. 1.25 01.5 002. 02.5 003. 03.5 004. 005. 007. 010. 012. 015. Max Ordering Ordering Nominal Cold Voltage Interrupting Number Number Resistance Rating Rating (Std.) (Mil.) (Ohms) (V) 251.062 253.062 125 7.000 251.125 253.125 125 1.700 251.250 253.250 125 0.665 251.375 253.375 125 0.395 251.500 253.500 125 0.280 251.750 253.750 125 0.175 251001. 253001. 125 0.128 300 amperes 2511.25 125 0.100 at rated 25101.5 25301.5 125 0.0823 voltage VDC 251002. 253002. 125 0.0473 50 amperes at 25102.5 125 0.0360 rated voltage 251003. 253003. 125 0.0290 VAC 25103.5 125 0.0240 251004. 253004. 125 0.0204 251005. 253005. 125 0.0155 251007. 253007. 125 0.0105 251010. 253010. 125 0.00705 251012. 32 0.0055 251015. 253015. 32 0.00446 Nominal Melting I2t (A2 sec) Nom Voltage Drop (mV) 0.000113 0.00174 0.0116 0.0296 0.0598 0.153 0.256 0.390 0.587 0.405 0.721 1.19 1.58 2.45 4.14 10.4 25.5 45.2 68.8 1.4 0.285 0.24 0.215 0.2165 0.176 0.194 0.2 0.21 0.141 0.132 0.131 0.1205 0.114 0.11 0.102 0.1 0.0878 0.071 Agency Approvals (R) (R) x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x PS E x x x x x x x x x x x x x TUV x x x x x x x x x x x x x Note: Higher ampere ratings are available. Please contact Littelfuse Technical Support or your Littelfuse products representative for assistance. (c)2008 Littelfuse, Inc. 1 Specifications are subject to change without notice. Revised: April 23, 2008 www.littelfuse.com for the most current information Please refer to http://www.littelfuse.com/series/251.html or /253.html for current information. 251/253 Series Cartridge, Axial Lead, and Socket Fuses PICO(R) II > Very Fast-Acting > 251/253 Series 1/4A 3/8A 1/2A 3/4A 1A 1 1/4A 1 1/2A 2A 2 1/2A 3A 3 1/2A 4A 5A 7A 10A 12A 15A 100 1/8A Average Time Current Curves 1/16A Temperature Rerating Curve TIME IN SECONDS 10 1 0.1 0.01 0.001 0.05 0.1 1 10 100 CURRENT IN AMPERES 1000 Soldering Parameters - Wave Soldering Recommended Process Parameters: Wave Parameter 280 260 240 Lead-Free Recommendation Preheat: 220 (Depends on Flux Activation Temperature) 200 180 160 140 120 100 (Typical Industry Recommendation) Temperature Minimum: 100 C Temperature Maximum: Preheat Time: 150 C 60-180 seconds Solder Pot Temperature: 260 C Maximum Solder Dwell Time: 2-5 seconds 80 60 40 20 240 230 220 210 200 190 180 170 160 150 140 130 120 110 90 100 80 70 60 50 40 30 0 20 Recommended Hand-Solder Parameters: 0 10 Temperature (C) - Measured on bottom side of board 300 Solder Iron Temperature: 350 C +/- 5C Heating Time: 5 seconds max. Time (Seconds) Cooling Time Preheat Time Dwell Time Note: These devices are not recommended for IR or Convection Reflow process. 251/253 Series 2 (c)2008 Littelfuse, Inc. Specifications are subject to change without notice. Revised: April 23, 2008 Please refer to www.littelfuse.com for the most currentinformation. information Please refer to http://www.littelfuse.com/series/251.html or /253.html for current Cartridge, Axial Lead, and Socket Fuses PICO(R) II > Very Fast-Acting > 251/253 Series Product Characteristics Encapsulated, Epoxy-Coated Body: Wire Leads. Pure Tin coated copper wire leads Materials Solderability MIL-STD-202, Method 208 Lead Pull Force MIL-STD-202. Method 211. Test Condition A (will withstand a 7 lb. axial pull test). Moisture Sensitivity Level J-STD 020 MSL Rating 2 Dimensions Operating Temperature -55OC to 125OC Shock MIL-STD-202, Method 213, Test Condition I (100 G's peak for 6 milliseconds) Vibration MIL-STD-202, Method 201 (10-55 )[ .FUIPE 5FTU$POEJUJPO$ o)[BU(T1FBL Moisture Resistance MIL-STD-202, Method 106 Resistance to Soldering Heat Withstands 60 seconds above 200OC and up to 260OC, maximum Flammability Rating UL 94V0 Part Numbering System 0251 xxxx N R T1 L 62.7 (2.468") 52.4 (2.062")* 27.78 (1.094") 7.11 (.280") **0.64 (.025") 1A 6.35 (.25") tape LF 27.78 (1.094") Series 2.80 (.11") 251 = Standard type 253 = Military type Current Rating 6.35 (.25") tape 5.0 (.197") 1A Refer to Amp Code column of Electrical Characteristics Table LF Quantity 251 series markings LF N = 5000 P = 2000 M = 1000 H = 100 V =5 1A Type of Packaging 253 series markings R = Reel A = Ammo Pack X = Loose Pack Lead Length T1: 52.4mm (2.062")* RoHS Packaging Packaging Option Packaging Specification Quantity & Packaging Code *T1: 52.4mm (2.062") Tape and Reel EIA 296 1MFBTFSFGFSUPBWBJMBCMFRVBOUJUJFT above in "Part Numbering System" /PUFT 5EJNFOTJPOJTEFmOFEBTUIFMFOHUIPGUIFDPNQPOFOUCFUXFFOUIFUXPUBQFT5IFGVMMDPNQPOFOUMFOHUIJTNN ** .025" diameter for 1/16-10A, .032" diameter for 12-15A. (c)2008 Littelfuse, Inc. 3 Specifications are subject to change without notice. Revised: April 23, 2008 www.littelfuse.com for the most current information Please refer to http://www.littelfuse.com/series/251.html or /253.html for current information. 251/253 Series