subminiature axial lead and cartridge fuses pico ii very fast-acting fuse 251/253 388 www.littelfuse.com the pico ii very fast-acting fuse is designed to meet an extensive array of performance characteristics in a space-saving subminiature package. ? rohs compliant version now available, use ordering suffix ? (see example on data sheet). electrical characteristics: % of ampere ampere opening rating rating time 100% 1/16 ?5 4 hours, min imum 1/16 ? 1 second, max imum 200% 10 3 seconds, max imum 12 ?5 10 seconds, max imum agency approvals: recognized under the components program of underwriters laboratories and certified by csa. approved by meti from 1 through 5 amperes. agency file numbers: ul e10480, csa lr 29862. reference to mil spec: available in fm10 on qpl for mil-prf-23419. to order, change 251 to 253 as shown below. interrupting ratings: 300 amperes at rated voltage vdc. 50 amperes at rated voltage vac. environmental specifications: operating temperature: ?5? to 125?. shock: mil-std-202, method 213, test condition i (100 g s peak for 6 milliseconds). vibration: mil-std-202, method 201 (10?5 hz); method 204, test condition c (55?000 hz at 10 g s peak). moisture resistance: mil-std-202, method 106. physical specifications: materials: encapsulated, epoxy-coated body; solder coated copper wire leads. rohs compliant product: pure tin coated copper wire leads. flammability rating: ul 94v0 soldering parameters: wave solder ?260?, 10 seconds maximum. 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). patented ordering information: 100 10 1 0.1 0.01 0.001 1/16a 0.05 0.1 1 10 100 1000 1/8a 1/4a 3/8a 1/2a 3/4a 1a 1 1/2a 2a 2 1/2a 3a 3 1/2a 4a 5a 7a 10a 12a 15a time in seconds current in amperes 1 1/4a std. type mil. type nominal nominal catalog catalog ampere voltage resistance melting i 2 t number number rating rating cold ohms a 2 sec. 0251 .062 0253 .062 1/16 125 7.0 0.000113 0251 .125 0253 .125 1/8 125 1.70 0.00174 0251 .250 0253 .250 1/4 125 0.665 0.0116 0251 .375 0253 .375 3/8 125 0.395 0.0296 0251 .500 0253 .500 1/2 125 0.280 0.0598 0251 .750 0253 .750 3/4 125 0.175 0.153 0251 001 0253 001 1 125 0.128 0.256 0251 1.25 1 1 / 4 125 0.100 0.390 0251 01.5 0253 01.5 1 1 / 2 125 0.0823 0.587 0251 002 0253 002 2 125 0.0473 0.405 0251 02.5 2 1 / 2 125 0.0360 0.721 0251 003 0253 003 3 125 0.0290 1.19 0251 03.5 3 1 / 2 125 0.0240 1.58 0251 004 0253 004 4 125 0.0204 2.45 0251 005 0253 005 5 125 0.0155 4.14 0251 007 0253 007 7 125 0.0105 10.4 0251 010 0253 010 10 125 0.00705 25.5 0251 012 12 32 0.0055 45.2 0251 015 0253 015 15 32 0.00446 68.8 average time current curves f l 1 a 38.1 (1.5") 38.1 (1.5") 7.11 (.280") ref. epoxy coating 0.64 (.025") dia. 2.80 (0.110") dia. max. note: .025" diameter for 1 / 16 ?0a, .032" diameter for 12 ?5a. note: higher ampere ratings available. contact technical assistance for details qpl packaging specifications: tape and reel per eia-296; t1: 2.062" (52.4mm) taped spacing; 5,000 per reel. options: for rohs compliant devices add the letter ? to end of packaging suffix. example: 0 251001.nrt1l (rohs compliant 1a, 5,000 per reel). rohs
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