27 surface mount fuses subminiature surface mount nanofuse very fast-acting type fuse nanofuse has similar electrical performance characteris- tics to the pico fuse and is designed to meet a wide variety of electrical and environmental mil specifications for more demanding applications. electrical characteristics: % of ampere ampere opening rating rating time 100% 1/16 ?5 4 hours, min imum 1/16 5 1 second, max imum 200% 7?0 5 seconds, max imum 12 ?5 20 seconds max imum agency approvals: recognized under the components program of underwriters laboratories and certified by csa. agency file numbers: ul e10480, csa lr 29862. interrupting ratings: 300 amperes at rated voltage vdc 50 amperes at rated voltage vac environmental specifications: operating temperature: 55? to 125?. shock: mil-std-202, method 213, test condition i (100 g s peak for six (6) milliseconds). vibration: mil-std-202, method 201 (10 55 hz, .06 in. total excursion). salt spray: mil-std-202 method 101, test condition b (48 hrs.). insulation resistance (after opening): mil-std-202, method 302, test condition a, (1/2 megohm minimum). resistance to soldering heat: mil-std-202, method 210, test condition f (20 sec. at 260?). thermal shock: mil-std-202, method 107, test condition b ( 65 to 125?). moisture resistance: mil-std-202, method 106, high humidity (90-98 rh), heat (65?. physical specifications: materials: body: ceramic terminations: plated brass caps. soldering parameters: wave solder ?260?, 10 seconds maximum reflow solder ?260?, 30 seconds maximum solderability: mil-std-202, method 208. packaging specifications: 12mm tape and reel per eia-rs481 (iec 286, part 3); 1,000 per reel. patented ordering information: 100 10 1 0.1 0.01 0.001 1000 100 10 1 0.1 0.05 1/16a 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 nominal nominal catalog ampere voltage resistance melting i 2 t number rating rating cold ohms a 2 sec. r271 .062 1/16 125 7.0 0.0000750 r271 .125 1/8 125 1.75 0.00163 r271 .250 1/4 125 0.665 0.0106 r271 .375 3/8 125 0.395 0.0254 r271 .500 1/2 125 0.304 0.0546 r271 .750 3/4 60 0.167 0.155 r271 001 1 60 0.109 0.281 r271 01.5 1 1 / 2 60 0.0603 0.650 r271 002 2 60 0.0440 0.421 r271 02.5 2 1 / 2 60 0.0340 0.721 r271 003 3 60 0.0270 1.23 r271 03.5 3 1 / 2 60 0.0220 1.65 r271 004 4 60 0.0190 2.35 r271 005 5 32 0.0145 3.90 r271 007 7 32 0.0085 10.5 r271 010 10 32 0.0055 24.2 r271 012 12 32 0.0044 45.5 r271 015 15 32 0.0033 70.1 average time current curves .117" .236" .071" min. .067" max. .080" max .070" .096" recommended pad layout .225" max.
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