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  • Manufacturer or author: Provided By digicamel.com
  • PDF pages: 4

Technical content

Features

Electrical Characteristics for Series % of Ampere Rating Ampere Rating Opening Time 100% 62mA - 15A 4 Hours, Min. 62mA - 7A 1 Second, Max. 10A 3 Seconds, Max. 12 - 15A 10 Seconds, Max. 275% 500mA, 1A, 2A, 2.5A, 3A, 4A, 5A, 7A, 10A 300 msecs., Max. 400% 500mA, 1A, 2A, 2.5A, 3A, 4A, 5A, 7A, 10A 30 msecs., Max. 1000% 500mA, 1A, 2A, 2.5A, 3A, 4A, 5A, 7A, 10A 4 msecs., Max.

Applications

E t 'MBUoQBOFMEJTQMBZ57 t -$%NPOJUPS t -$%CBDLMJHIUJOWFSUFS t 0GmDFNBDIJOFT t 1PXFSTVQQMZ t "VEJP7JEFPTZTUFN t -JHIUJOHTZTUFN t .FEJDBMFRVJQNFOU 4FDPOEBSZQSPUFDUJPOGPSTQBDFDPOTUSBJOFEBQQMJDBUJPOT TUV QPL t 7FSZGBTUBDUJOH t 4NBMMTJ[F t 8JEFDVSSFOUSBUJOH range (62mA- 15A) t 3P)4DPNQMJBOU t )BMPHFOGSFFBWBJMBCMF t 8JEFPQFSBUJOH temperature range t -PXUFNQFSBUVSF rerating

© 2012 Littelfuse, Inc. Specifications are subject to change without notice. Axial Lead & Cartridge Fuses 251/253 Series Please refer to www.littelfuse.com/series/251.html or /253.html for current information. PICO® ll > Very Fast-Acting > 251/253 Series Ampere Rating (A) Amp Code Ordering Number (Std.) Ordering Number (Mil.) Max Voltage Rating (V) Interrupting Rating Nominal Cold Resistance (Ohms) Nominal Melting I2t (A2 sec) Nom Voltage Drop (V) Agency Approvals PS E TUV QPL .062 .062 251 .062 253.062 125

300 A @ rated

WPMUBHF%$

50 A @ rated

WPMUBHF"$ For CCC 7A:

70 A @ rated

WPMUBHF"$ For CCC 10A:

100 A @ rated

WPMUBHF"$ 7 .000 0.0001 13 1 .4 x x x Electrical Specifications by Item Note: )JHIFSBNQFSFSBUJOHTBSFBWBJMBCMF1MFBTFDPOUBDU-JUUFMGVTF5FDIOJDBM4VQQPSUPSZPVS-JUUFMGVTFQSPEVDUTSFQSFTFOUBUJWFGPSBTTJTUBODF

© 2012 Littelfuse, Inc. Specifications are subject to change without notice. Axial Lead & Cartridge Fuses 251/253 Series Please refer to www.littelfuse.com/series/251.html or /253.html for current information. PICO® ll > Very Fast-Acting > 251/253 Series 251/253 Series Average Time Current Curves Soldering Parameters 100 0.1 0.01 0.001 .062A 0.05 0.1 1 10 100 1000 .125A .250A .375A .500A .750A .630A 1.5A 2.5A 3.5A 10A 12A 15A TIME IN SECONDS CURRENT IN AMPERES 1.25A Wave Parameter Lead-Free Recommendation Preheat: %FQFOETPO'MVY"DUJWBUJPO5FNQFSBUVSF 5ZQJDBM*OEVTUSZ3FDPNNFOEBUJPO Temperature Minimum: 100° C Temperature Maximum: 150° C Preheat Time: 60-180 seconds Solder Pot Temperature: 260° C Maximum Solder Dwell Time: 2-5 seconds Recommended Hand Soldering Parameters: 4PMEFS*SPO5FNQFSBUVSF¡$ Heating Time: 5 seconds max. Note: These devices are not recommended for IR or Convection Reflow process Recommended Process Parameters: Note: 1 . Rerating depicted in this curve is in addition to the standard rerating of 25% for continuous operation. T emperature Rerating Curve

© 2012 Littelfuse, Inc. Specifications are subject to change without notice. Axial Lead & Cartridge Fuses 251/253 Series Please refer to www.littelfuse.com/series/251.html or /253.html for current information. PICO® ll > Very Fast-Acting > 251/253 Series Materials &ODBQTVMBUFE &QPYZ$PBUFE Body:1VSF5JODPBUFE$PQQFSXJSFMFBET Solderability .*-45% .FUIPE Lead Pull Force .*-45% .FUIPE 5FTU$POEJUJPO " XJMMXJUITUBOEBMCTBYJBMQVMMUFTU Fuses T o MIL SPEC 4FSJFTJTBWBJMBCMFJO'.PO QPL for MIL -PRF-23419. To order, change 251 to 253 Product Characteristics Operating Temperature o$UP Shock .*-45% .FUIPE 5FTU Condition I (100 G’s peak for 6 msecs.) Vibration .*-45% .FUIPE o .FUIPE 5FTU$POEJUJPO$ o)[BU(T1FBL Moisture Resistance .*-45% .FUIPE Resistance to Soldering Heat 8JUITUBOETTFDPOETBCPWF OC and up to 260ºC, maximum Flammability Rating UL 94V–0 Dimensions Packaging Part Numbering System Packaging Option Packaging Specification Quantity & Packaging Code 5NN 5BQFBOE3FFM EIA 296 1MFBTFSFG FSUPBWBJMBCMFRVBOUJUJFT above in "Part Numbering System” 5NN h 5BQFBOE3FFM EIA 296 0251 xxxx N R T1 L Lead Length Type of Packaging Quantity Current Rating Series 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** R = Reel A = Ammo Pack X = Loose Pack N = 5000 P = 2000 M = 1000 H = 100 Refer to Amp Code column of Electrical Specifications Table 251 = Standard type 253 = Military type Option Codes L = RoHS + HF 5IFEFGBVMUMFBEMFOHUIGPSCPUIBNNPQBDLBOEMPPTFQBDLJT5GPSBOEJT5GPS /PUFT 5EJNFOTJPOJTEFmOFEBTUIFMFOHUIPGUIFDPNQPOFOUCFUXFFOUIFUXPUBQFT5IFGVMMDPNQPOFOUMFOHUIJTNN T1 length is for 251 series only. 5EJNFOTJPOJTEFmOFEBTUIFMFOHUIPGUIFDPNQPOFOUCFUXFFOUIFUXPUBQFT5IFGVMMDPNQPOFOUMFOHUIJTNN w T3 length is for 253 series only. Wire Diameter: 0.81 (.032") for 15 amp Wire Diameter: 0.81 (.032") for 12-15 amp 2.61 (.103") MAX 6.35 (.25") tape tape 38.1 (1.5") 38.1 (1.5")7.11 (.280") 83.31 (3.28")

253 Series (RoHS Version) Markings

(T3 lead length) L 1 A L 1 A 73.0 (2.874")** L 1 A FL1 A 27.78 (1.094") 27.78 62.7 (2.468") 52.4 (2.062")* 2.80 (.11") MAX 6.35 (.25") tape tape

251 Series (RoHS and Halogen-free Version) Markings

(T1 lead length) Wire Diameter: 0.81 (.032") for 12-15 amp FL1 A FL1 A 27.78 (1.094") 27.78 62.7 (2.468") 52.4 (2.062")* 2.80 (.11") MAX 6.35 (.25") tape tape

251 Series (RoHS Version) Markings

(T1 lead length) F F F