10 surface mount fuses telecom nano 2 fuse 461 series and teccor telelink fuse l f 1.25a t 3.12 (.123") 3.12 (.123") 10.10 (.397") 3.25 (.128") 3.43 (.135") 12.6 (.496") 6.10 (.240") recommended pad layout 1.70 typ (.067") ?surface mount surge resistant slo-blo fuse. ?meets ul 60950 3rd edition power cross requirements stand alone. ?designed to allow compliance with telcordia gr-1089-core and tia-968-a (formerly fcc part 68) surge specifications. ?provides coordinated protection with littelfuse sidactor protection thyristors without series resistors. ?ideal for use in telecommunication equipment including line cards, modems, fax machines, phones, answering machines, caller id devices and other products connected to phone network. ?2a rating has improved temperature rise performance under 2.2a surge current testing when compared with 1.25a rating. ?product is rohs compliant and compatible with lead-free solders and higher temperature profiles when ordered with standard silver plated brass caps. ?standard product is rohs compliant and compatible with lead-free solders and higher temperature profiles. telecom teccor nano 2 telelink nominal nominal catalog catalog ampere voltage resistance melting i 2 t number number rating rating cold ohms a 2 sec. 0461 .500 f0500t 0.5 250 .560 .840 1 0461 1.25 f1250t 1.25 250 .110 16.5 1 0461 002. f1251t 2.00 250 .050 17.5 1 ordering information: notes: 1 i 2 t is calculated at 10 msec or less. i 2 t at 10 times rated current has a typical value of: 24 a 2 sec (2.0a), 22 a 2 sec (1.25a), 1.3 a 2 sec (0.5a). ? typical inductance < 40nh up to 500 mhz. ? resistance changes 0.5% for every ?c. ? resistance is measured at 10% rated current. agency approvals: recognized under the components program of underwriters laboratories and certified by csa. littelfuse: ul e10480 csa lr29862 teccor: ul e191008 csa lr702828 physical specifications: materials: body: ceramic rohs compliant terminations: silver plated brass caps terminations: tin-lead alloy also available, add suffix, t. soldering parameters: reflow solder ?230?, 30 seconds maximum. wave solder ?260?, 3 seconds maximum. packaging specifications: 24mm tape and reel per eia-rs481-2, (iec 286 part 3); 2500 fuses per reel, add suffix, er. reference dimensions: 1000 100 10 1 0.1 0.001 0.01 0.1 1 10 100 current in amperes time in seconds 1.25a 2a .500a miniature surface mount 377 surface mount fuses www.littelfuse.com rohs
miniature surface mount 378 surface mount fuses www.littelfuse.com maximum temperature rise: telecom nano 2 fuse temperature reading 04611.25 < 82 ? c (180 ? f) 0461002. < 50 ? c (122 ? f) higher currents and pcb layout designs can affect this parameter. readings are measured at rated current after temperature stabilizes. telecom nano 2 fuse 461 series and teccor telelink fuse interrupting ratings: 50 amperes at 250 vac. percent of rating* ambient temperature 248 f 212 f 176 f 140 f 104 f 68 f 32 f -4 f -40 f -76 f 120 c 100 c 80 c 60 c 40 c 20 c 0 c -20 c -40 c -60 c 80 60 40 20 100 120 140 operating temperature is -55 ? c to +125 ? c with proper correction factor applied ambient temperature effects are in addition to the normal derating. temperature derating curve surge minimum minimum max repetitions fuse peak peak rise/min. each choices voltage current decay polarity (v) (a) ( s) 1 600 100 10/1000 25 1.25, 2.0 2 1000 100 10/360 25 1.25, 2.0 3 1000 100 10/1000 25 1.25, 2.0 4 2500 500 2/10 10 1.25, 2.0 5 1000 25 10/360 5 0.5, 1.25, 2.0 if sufficient series resistance is used, then the 0.5 fuse may be used in test conditions 1-4. gr 1089 inter-building requirements gr 1089 1 st level lighting surge inter-building (equipment under test can not be damaged & must continue to operate properly) gr 1089 ac power fault 2 nd level (fuse can open but must open in a safe and controlled manner) test vrms short duration fuse circuit (a) 1 120, 277 25 15 min. 0.5, 1.25, 2.0 2 600 60 5 sec. 0.5, 1.25, 2.0 3 600 7 5 sec. 0.5, 1.25, 2.0 4 100-600 2.2 15 min.. 0.5, 1.25, 2.0 5 diagram diagram 15 min. 0.5, 1.25, 2.0 fuse must open before wiring simulator fuse (mdl 2.0). electrical characteristics: % of ampererating openingtime 100% 4 hours, min . 250% 1 second, min.; 120 seconds, max. gr 1089 ac power fault 1 st level inter-building (fuse not allowed to open) test vrms short duration primary fuse circuit protector choices current (a) 1 50 .33 15 min. removed 1.25, 2.0 2 100 .17 15 min removed 1.25, 2.0 3 200,400, 600 1 60 x 1 sec. removed 1.25, 2.0 4 1000 1 60 x 1 sec. operative 1.25, 2.0 5 diagram diagram 60 x 5 sec. removed 1.25, 2.0 6 600 0.5 30s removed 1.25, 2.0 7 440 2.2 5 x 2 sec. removed 1.25, 2.0 8 600 3 1.1 sec. removed 1.25, 2.0 9 1000 5 0.4 sec. in place 1.25, 2.0 gr 1089 2 nd level lightning surge telecom port (equipment under test shall not become a fire, fragmentation, or electri- cal safety hazard) surge minimum minimum max repetitions fuse peak peak rise/min. each choices voltage current decay polarity (v) (a) ( s) 1 5000 500 2/10 1 0.5, 1.25, 2.0 alternative 5000 5000/8=625 8/20 1 0.5, 1.25, 2.0 the 0.5 fuse will open during these test conditions. the 1.25 & 2.0 will not open thus providing operational compliance.
10 surface mount fuses miniature surface mount 379 surface mount fuses www.littelfuse.com telecom nano 2 fuse 461 series and teccor telelink fuse test voltage current waveform repetitions fuse (v) (a) choices impulse for handheld units 2500 62.5 10 x 700 s+ 10 w/60 sec. rest 0.5, 1.25, 2.0 non handheld 1500 37.5 10 x 700 s+ 10 w/60 sec. rest 0.5, 1.25, 2.0 steady-state for handheld units 1500 60hz 0.5, 1.25, 2.0 non handheld 1000 60hz 0.5, 1.25, 2.0 surge voltage waveform current waveform reps recommended (v) ( s) (a) ( s) fuse metallic a 800 10 x 560 100 10 x 560 1 ea. polarity 1.25 longitudinal a 1500 10 x 160 200 10 x 160 1 ea. polarity 1.25 metallic b 1000 9 x 720 25 5 x 320 1 ea. polarity 1.25 longitudinal b 1500 9 x 720 37.5 5 x 320 1 ea. polarity 1.25 for the type a events the 0.5 fuse will open, providing non-operational compliance. the 1.25 & 2.0 will not open, providing for operational compliance with tia-968-a type a surge events. tia 968-a (formerly fcc part 68) surge waveforms (fuse can not open during type b events) ul60950 (en 60950) (formerly ul 1950) power cross (l = longitudinal, m = metallic) test voltage current time fuse number (v) (a) choices l1 600 40 1.5 sec. 0.5, 1.25, 2.0 l2 600 7 5 sec. 0.5, 1.25, 2.0 l3 600 2.2 30 min. 0.5, 1.25, 2.0 l4 200 2.2 30 min. 0.5, 1.25, 2.0 l5 120 25 30 min. 0.5, 1.25, 2.0 m1 600 40 1.5 sec. 0.5, 1.25, 2.0 m2 600 7 5 sec. 0.5, 1.25, 2.0 m3 600 2.2 30 min. 0.5, 1.25, 2.0 m4 600 2.2 30 min. 0.5, 1.25, 2.0 selection of test number depends on current limiting & fire enclosure/spacing of end product 26 awg line cord removes l1/m1 test requirement l5 conducted only if product does not pass section 6.1.2 l2,m2,l3,m3,l4,m4 conducted if not in a fire enclosure fuse must open before the wiring simulator fuse (mdl 2.0). ul 60950 requirements ul60950 (en 60950) (formerly ul 1950) impulse test & steady-state electric strength test
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