Cartridge Cartridge and Axial and Axial Lead Fuses Lead Fuses (R) PICO(R) IIPICO > Very IIFast-Acting > Very Fast-Acting > 251/253 > 251/253 Series Series 251/253 Series, RoHS PICO(R) II, Very Fast-Acting Fuse PS E (R) (R) TUV QPL 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 (62mA- 15A) t -PXUFNQFSBUVSFEFSBUJOH Applications 4FDPOEBSZQSPUFDUJPOGPSTQBDFDPOTUSBJOFEBQQMJDBUJPOT Agency Approvals Agency Agency File Number Ampere Range E10480 62mA - 15A LR 29862 62mA - 15A PS E JET 1896-31007-1001 1A - 5A TUV J02037794 500mA - 10A (R) (R) QPL t 'MBUoQBOFMEJTQMBZ57 t 1PXFSTVQQMZ t -$%NPOJUPS t "VEJP7JEFPTZTUFN t -$%CBDLMJHIUJOWFSUFS t -JHIUJOHTZTUFN t 0GmDFNBDIJOFT t .FEJDBMFRVJQNFOU Electrical Characteristics % of Ampere Rating Ampere Rating 100% 1/16-15 )PVST Min. 1/16-7 4FDPOET Max. 10 4FDPOET Max. 12-15 4FDPOET Max. 62mA - 15A FM10 200% Opening Time Electrical Characteristics Max Nominal Ampere Ordering Ordering Nominal Amp Voltage Interrupting Cold Rating Number Number Melting Code Rating Rating Resistance 2 (A) (Std.) (Mil.) I t (A2 sec) (V) (Ohms) .062 .125 .250 .375 .500 .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 .750 001. 1.25 01.5 002. 02.5 003. 03.5 004. 005. 007. 010. 012. 015. 251.062 251.125 251.250 251.375 251.500 251.750 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 32 32 300 amperes at rated WPMUBHF7%$ 50 amperes at SBUFEWPMUBHF VAC 7.000 1.700 0.665 0.395 0.280 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 0.153 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 Nom Voltage Drop (mV) Agency Approvals (R) (R) 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 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 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 Note: )JHIFSBNQFSFSBUJOHTBSFBWBJMBCMF1MFBTFDPOUBDU-JUUFMGVTF5FDIOJDBM4VQQPSUPSZPVS-JUUFMGVTFQSPEVDUTSFQSFTFOUBUJWFGPSBTTJTUBODF (c)2008 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com for current information. 1 Revised: August 14, 2008 251/253 Series Cartridge and Axial Lead Fuses PICO(R) II > Very Fast-Acting > 251/253 Series 0.250A 0.375A 0.50A 0.75A 1.00A 1.25A 1.50A 2.0A 2.5A 3.0A 3.5A 4A 5A 7A 10A 12A 15A 100 0.125A Average Time Current Curves 0.062A Temperature Rerating Curve TIME IN SECONDS 10 1 0.1 0.01 Soldering Parameters Recommended Process Parameters: Wave Parameter Lead-Free Recommendation 0.001 0.05 0.1 Preheat: %FQFOETPO'MVY"DUJWBUJPO5FNQFSBUVSF 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 1 10 100 CURRENT IN AMPERES 1000 Recommended Hand-Solder Parameters: 4PMEFS*SPO5FNQFSBUVSF$ $ )FBUJOH5JNFTFDPOETNBY Note: These devices are not recommended for IR or Convection Reflow process. 251/253 Series 2 Revised: August 14, 2008 (c)2008 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com for current information. Cartridge Cartridge and Axial and Axial Lead Fuses Lead Fuses (R) PICO(R) IIPICO > Very IIFast-Acting > Very Fast-Acting > 251/253 > 251/253 Series Series Product Characteristics Materials &ODBQTVMBUFE &QPYZ$PBUFE #PEZ1VSF5JODPBUFE$PQQFSXJSFMFBET Operating Temperature o$UP $ Solderability .*-45% .FUIPE Shock Lead Pull Force .*-45% .FUIPE 5FTU$POEJUJPO " XJMMXJUITUBOEBMCTBYJBMQVMMUFTU .*-45% .FUIPE 5FTU Condition I (100 G's peak for 6 NJMMJTFDPOET Vibration Fuses To MIL SPEC 4FSJFTJTBWBJMBCMFJO'.PO 21-GPS.*-13'5PPSEFS DIBOHF 251 to 253 .*-45% .FUIPE o )[ .FUIPE 5FTU$POEJUJPO$ o)[BU(T1FBL Moisture Resistance .*-45% .FUIPE Resistance to Soldering Heat 8JUITUBOETTFDPOETBCPWFOC and up to 260$ NBYJNVN Flammability Rating UL 94V-0 Part Numbering System Dimensions 251 series 27.78 (1.094") (T1 lead length) 62.7 (2.468") 52.4 (2.062")* 7.11 (.280") 1A LF 5.0 (.197") 6.35 (.25") tape 1A 0251 xxxx N R T1 L Series 27.78 (1.094") 251 = Standard type 253 = Military type Current Rating 2.80 (.11") MAX Refer to Amp Code column of Electrical Characteristics Table 6.35 (.25") tape Quantity LF N = 5000 P = 2000 M = 1000 H = 100 V =5 Wire Diameter: 0.64 (.025") for 0.62-10.0 amp, 0.81 (.032") for 12-15 amp Type of Packaging 253 series (T3 lead length) R = Reel A = Ammo Pack X = Loose Pack 83.31 (3.28") 38.1 (1.5") 73.0 (2.874")** 7.11 (.280") LF LF Lead Length 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** 1A 2.80 (.11") MAX 5.0 (.197") 6.35 (.25") tape 38.1 (1.5") 6.35 (.25") tape 1A Wire Diameter: 0.64 (.025") for 0.62-10.0 amp, 0.81 (.032") for 15 amp RoHS Packaging Packaging Option Packaging Specification 5NN 5BQFBOE3FFM EIA 296 5NN h 5BQFBOE3FFM Quantity & Packaging Code 1MFBTFSFGFSUPBWBJMBCMFRVBOUJUJFT BCPWFJO1BSU/VNCFSJOH4ZTUFNw EIA 296 5IFEFGBVMUMFBEMFOHUIGPSCPUIBNNPQBDLBOEMPPTFQBDLJT5GPSBOEJT5GPS /PUFT 5EJNFOTJPOJTEFmOFEBTUIFMFOHUIPGUIFDPNQPOFOUCFUXFFOUIFUXPUBQFT5IFGVMMDPNQPOFOUMFOHUIJTNN T1 length is for 251 series only. 5EJNFOTJPOJTEFmOFEBTUIFMFOHUIPGUIFDPNQPOFOUCFUXFFOUIFUXPUBQFT5IFGVMMDPNQPOFOUMFOHUIJTNN w T3 length is for 253 series only. (c)2008 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com for current information. 3 Revised: August 14, 2008 251/253 Series