Axial Lead & Cartridge Fuses PICO® ll > Very Fast-Acting > 251/253 Series 251/253 Series, PS E PICO® II, Very Fast-Acting Fuse TUV QPL Description The PICO® 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 4NBMMTJ[F t 8JEFDVSSFOUSBUJOH range (62mA- 15A) t 3P)4DPNQMJBOU t )BMPHFOGSFFBWBJMBCMF t 8JEFPQFSBUJOH temperature range t -PXUFNQFSBUVSF rerating Applications Agency Approvals 4FDPOEBSZQSPUFDUJPOGPSTQBDFDPOTUSBJOFEBQQMJDBUJPOT Agency File Number Ampere Range E10480 62mA - 15A LR 29862 62mA - 15A PS E JET 1896-31007-1001 1A - 5A TUV J50158379 500mA - 10A QPL FM10 62mA - 15A 2009010207366577 – 500mA to 5A 500mA, 1A, 2A, 2.5A, 3A, 4A, 5A t 'MBUoQBOFMEJTQMBZ57 t 1PXFSTVQQMZ t -$%NPOJUPS t "VEJP7JEFPTZTUFN t -$%CBDLMJHIUJOWFSUFS t -JHIUJOHTZTUFN t 0GmDFNBDIJOFT t .FEJDBMFRVJQNFOU Electrical Characteristics for Series % of Ampere Rating Ampere Rating 100% 62mA - 15A 4 Hours, Min. 62mA - 7A 1 Second, Max. 200% 275% 400% 1000% © 2012 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/251.html or /253.html for current information. Opening Time 10A 3 Seconds, Max. 12 - 15A 10 Seconds, Max. 500mA, 1A, 2A, 2.5A, 3A, 4A, 5A, 7A, 10A 500mA, 1A, 2A, 2.5A, 3A, 4A, 5A, 7A, 10A 500mA, 1A, 2A, 2.5A, 3A, 4A, 5A, 7A, 10A 300 msecs., Max. 30 msecs., Max. 4 msecs., Max. 251/253 Series Revised: September 6, 2012 251/253 Series Agency Axial Lead & Cartridge Fuses PICO® ll > Very Fast-Acting > 251/253 Series Electrical Specifications by Item Agency Approvals Nom Max Nominal Ampere Nominal Ordering Ordering Voltage Amp Voltage Interrupting Cold Rating Melting Number Number Drop Code Rating Rating Resistance 2 (A) I t (A2 sec) (Std.) (Mil.) (V) (V) (Ohms) .062 .125 .250 .375 .500 .630 .750 1.00 1.25 1.50 2.00 2.50 3.00 3.50 4.00 5.00 7.00 10.0 12.0 15.0 .062 .125 .250 .375 .500 .630 .750 001. 1.25 01.5 002. 02.5 003. 03.5 004. 005. 007. 010. 012. 015. 251.062 251.125 251.250 251.375 251.500 251.630 251.750 251001. 2511.25 25101.5 251002. 25102.5 251003. 25103.5 251004. 251005. 251007. 251010. 251012. 251015. 253.062 253.125 253.250 253.375 253.500 253.750 253001. 25301.5 253002. 253003. 253004. 253005. 253007. 253010. 253015. 125 125 125 125 125 125 125 125 125 125 125 125 125 125 125 125 125 125 32 32 300 A @ rated WPMUBHF%$ 50 A @ rated WPMUBHF"$ For CCC 7A: 70 A @ rated WPMUBHF"$ For CCC 10A: 100 A @ rated WPMUBHF"$ 7.000 1.700 0.665 0.395 0.280 0.205 0.175 0.128 0.100 0.0823 0.0473 0.0360 0.0290 0.0240 0.0204 0.0155 0.0105 0.00705 0.0055 0.00446 0.000113 0.00174 0.0116 0.0296 0.0598 0.094 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 0.188 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 PS E 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 x x x x x x x x x x x TUV QPL 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 Note: )JHIFSBNQFSFSBUJOHTBSFBWBJMBCMF1MFBTFDPOUBDU-JUUFMGVTF5FDIOJDBM4VQQPSUPSZPVS-JUUFMGVTFQSPEVDUTSFQSFTFOUBUJWFGPSBTTJTUBODF 251/253 Series © 2012 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/251.html or /253.html for current information. Axial Lead & Cartridge Fuses PICO® ll > Very Fast-Acting > 251/253 Series .250A .375A .500A .630A .750A 1A 1.25A 1.5A 2A 2.5A 3A 3.5A 4A 5A 7A 10A 12A 15A .125A Average Time Current Curves .062A Temperature Rerating Curve 100 TIME IN SECONDS 10 1 0.1 Note: 1. Rerating depicted in this curve is in addition to the standard rerating of 25% for continuous operation. 0.01 Soldering Parameters Recommended Process Parameters: Wave Parameter Lead-Free Recommendation 0.001 0.05 0.1 1 10 100 1000 CURRENT IN AMPERES Preheat: 5ZQJDBM*OEVTUSZ3FDPNNFOEBUJPO 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 251/253 Series %FQFOETPO'MVY"DUJWBUJPO5FNQFSBUVSF Recommended Hand Soldering Parameters: 4PMEFS*SPO5FNQFSBUVSF¡$¡$ Heating Time: 5 seconds max. Note: These devices are not recommended for IR or Convection Reflow process © 2012 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/251.html or /253.html for current information. 251/253 Series Axial Lead & Cartridge Fuses PICO® ll > Very Fast-Acting > 251/253 Series Product Characteristics Materials &ODBQTVMBUFE&QPYZ$PBUFE Body:1VSF5JODPBUFE$PQQFSXJSFMFBET Operating Temperature o$UP$ Solderability .*-45%.FUIPE Shock Lead Pull Force .*-45%.FUIPE5FTU$POEJUJPO "XJMMXJUITUBOEBMCTBYJBMQVMMUFTU .*-45%.FUIPE5FTU Condition I (100 G’s peak for 6 msecs.) Vibration Fuses To MIL SPEC 4FSJFTJTBWBJMBCMFJO'.PO QPL for MIL-PRF-23419. To order, change 251 to 253 .*-45%.FUIPEo )[ .FUIPE5FTU$POEJUJPO$ o)[BU(T1FBL Moisture Resistance .*-45%.FUIPE Resistance to Soldering Heat 8JUITUBOETTFDPOETBCPWFOC and up to 260ºC, maximum Flammability Rating UL 94V–0 Part Numbering System Dimensions 251 Series (RoHS Version) Markings (T1 lead length) 62.7 (2.468") 52.4 (2.062")* 27.78 (1.094") 7.11 (.280") 1A 6.35 (.25") tape LF 5.0 (.197") 1A 0251 xxxx N R T1 L 27.78 (1.094") 2.80 (.11") MAX Series 251 = Standard type 253 = Military type 6.35 (.25") tape LF Refer to Amp Code column of Electrical Specifications Table Wire Diameter: 0.64 (.025") for 0.62-10.0 amp, 0.81 (.032") for 12-15 amp Quantity 251 Series (RoHS and Halogen-free Version) Markings (T1 lead length) 62.7 (2.468") 52.4 (2.062")* 27.78 (1.094") 7.11 (.280") LF 6.35 (.25") tape 1A 27.78 (1.094") 1A 6.35 (.25") tape LF Wire Diameter: 0.64 (.025") for 0.62-10.0 amp, 0.81 (.032") for 12-15 amp The default lead length for Ammo pack and Loose pack is now T1 for 251 series, and remains T3 for 253 series, therefore: T1 = 52.4mm (2.062”), 251 series only* Blank = 52.4mm (2.062”) for 251 series* or 73mm (2.874”) for 253 series** (T3 lead length) 83.31 (3.28") 6.35 (.25") tape 73.0 (2.874")** 7.11 (.280") LF 1A LF 1A 38.1 (1.5") 2.61 (.103") MAX 5.0 (.197") R = Reel A = Ammo Pack X = Loose Pack Lead Length 253 Series (RoHS Version) Markings 38.1 (1.5") N = 5000 P = 2000 M = 1000 H = 100 Type of Packaging 2.80 (.11") MAX 5.0 (.197") Current Rating 6.35 (.25") tape Option Codes L = RoHS + HF Wire Diameter: 0.64 (.025") for 0.62-10.0 amp, 0.81 (.032") for 15 amp Packaging Packaging Option 5NN 5BQFBOE3FFM Packaging Specification Quantity & Packaging Code EIA 296 1MFBTFSFGFSUPBWBJMBCMFRVBOUJUJFT above in "Part Numbering System” 5NNh 5BQFBOE3FFM EIA 296 5IFEFGBVMUMFBEMFOHUIGPSCPUIBNNPQBDLBOEMPPTFQBDLJT5GPSBOEJT5GPS /PUFT 5EJNFOTJPOJTEFmOFEBTUIFMFOHUIPGUIFDPNQPOFOUCFUXFFOUIFUXPUBQFT5IFGVMMDPNQPOFOUMFOHUIJTNN T1 length is for 251 series only. 5EJNFOTJPOJTEFmOFEBTUIFMFOHUIPGUIFDPNQPOFOUCFUXFFOUIFUXPUBQFT5IFGVMMDPNQPOFOUMFOHUIJTNNw T3 length is for 253 series only. 251/253 Series © 2012 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/251.html or /253.html for current information.