www.littelfuse.com ?2006 littelfuse 250r series specifcations are subject to change without notice. electronics designers guide polyfuse ? resettable ptcs radial leaded ? the 250r series is designed to protect against short duration high voltage fault currents (power cross or power induction surge) typically found in telecom applications (250vrms). the series can be used to help telecom networking equipment meet the protection requirements specifed in itu k.20 and k.21. electrical characteristics part number i hold (a) i trip (a) v max v int / v op i max (a) p d max. (w) maximum time to trip resistance agency approvals current (a) time (sec.) r min ( ) r typ ( ) r 1max ( ) 250r080t 0.08 0.16 250/60 3 1 0.35 3 15 22 33 x x 250r080 0.08 0.16 250/60 3 1 0.35 3 14 22 33 x x 250r120 0.12 0.24 250/60 3 1 1 1.5 4 8 16 x x 250r120-ra 0.12 0.24 250/60 3 1 1 1.0 7 9 16 x x 250r120-rc 0.12 0.24 250/60 3 1 1 0.85 5.4 7.5 14 x x 250R120-RF 0.12 0.24 250/60 3 1 1 0.7 6 10.5 16 x x 250r120-r1 0.12 0.24 250/60 3 1 1 0.8 6 9 16 x x 250r120-r2 0.12 0.24 250/60 3 1 1 0.7 8 10.5 16 x x 250r120-r3 0.12 0.24 250/60 3 1 1 1 8 10 16 x x 250r120t 0.12 0.24 250/60 3 1 1 1.2 7 12 16 x x 250r145 0.145 0.29 250/60 3 1 1 2.5 3 6 14 x x 250r145-ra 0.145 0.29 250/60 3 1 1 5 3 5.5 12 x x 250r145-rb 0.145 0.29 250/60 3 1 1 2.5 4.5 6 14 x x 250r145t 0.145 0.29 250/60 3 1 1 2.0 5.4 7.5 14 x x 250r180 0.18 0.65 250/60 10 1.8 1 21 0.8 2.2 4 x x 250r180t 0.18 0.65 250/60 10 1.8 1 20 1.4 3.9 4.5 x x *typical value c: coated device t: pre-tripped device description features applications ? rohs compliant and lead-free ? fast time-to-trip ? binned and sorted narrow resistance ranges available ? 0.08 C 0.18 hold current range, 60vdc operating voltage ? 250vac interrupt rating ? customer premises equipment (cpe) ? central offce (co)/ telecom centers ? lan/wan equipment ? access equipment 250r series agency approvals agency agency file number e183209 r50082521
www.littelfuse.com ?2006 littelfuse 250r series specifcations are subject to change without notice. 2 electronics designers guide polyfuse ? resettable ptcs radial leaded ambient operation temperature -40c -20c 0c 23c 40c 50c 60c 70c 85c part number hold current (a) 250r080 0.12 0.11 0.09 0.08 0.06 0.05 0.05 0.04 0.03 250r080t 0.12 0.11 0.09 0.08 0.06 0.05 0.05 0.04 0.03 250r120 0.18 0.16 0.14 0.12 0.10 0.09 0.08 0.06 0.05 250r120t 0.18 0.16 0.14 0.12 0.10 0.09 0.08 0.06 0.05 250r145 0.26 0.20 0.17 0.145 0.12 0.11 0.09 0.08 0.06 250r145t 0.26 0.20 0.17 0.145 0.12 0.11 0.09 0.08 0.06 250r180 0.28 0.23 0.21 0.18 0.16 0.13 0.10 0.11 0.083 250r180t 0.28 0.23 0.21 0.18 0.16 0.13 0.10 0.11 0.083 temperature rerating temperature rerating curve -40 -30 -20 -10 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 10% 30% 50% 70% 90% 110% 130% 150% 170% te mperature (c) percentage of rated current average time current curves current in ampere s time in seconds 0.001 0.010 0.100 1 10 10 0 100 0 10000 100000 0.100 1 10 100 0.02 0.080a 0.120a 0.145a 0.180a 250r series specif ications ar e s ubject to change wi thout notice . note : 1 .0 0 m eans the number one wi th tw o decimal places . akl v3.9 06.05.18 the average time current curves and temperature rerating curve performance is affected by a number or variables, and these curves provided as guidance only. customer must verify the performance in their application.
www.littelfuse.com ?2006 littelfuse 250r series specifcations are subject to change without notice. electronics designers guide polyfuse ? resettable ptcs radial leaded protection application guide region/specifcation application device selection south america/asia/europe itu k.45 *access network equipment remote terminal repeaters wan equipment cross Cconnect 250r180 250r180t 250r145 250r145t 250r120 250r120t south america/asia/europe itu k.21 customer and it equipment analog modems adsl, xdsl phone sets, pbx systems internet appliances pos terminals 250r180 250r180t 250r145 250r145t 250r120 250r120t south america/asia/europe itu k.20 central offce pots/isdn linecards t1/e1/j1 linecards adsl/vdsl splitters csu/dsu 250r180 250r180t 250r145 250r145t 250r120 250r120t north america telcordia gr-974 *primary protection modules mdf modules network interface 250r180 250r180t 250r145 250r145t 250r120 250r120t south america/asia/europe itu k.20 north america telcordia gr-1089 *intrabuilding communication systems lan, voip cards local loop handsets 250r180 250r180t 250r145 250r145t 250r120 250r120t south america/asia/europe itu k.20 and k.21 lan intrabuilding power cross protection lan equipment, ip phone 250r080 *resistance binned parts are recommended agency specifcation selection guide for telecom and networking applications product lightning power cross 250r120 250r145 itu k.20/21/45 C 1.5kv 10/700s itu k.20/21/45 C 4kv 10/700s* itu k.20/21/45 C 230vac, 10 itu k.20/21/45 C 600vac, 600 250r180 itu k.20/21/45 C 1.5kv 10/700s itu k.20/21/45 C 4kv 10/700s* telcordia gr C 974 C 1.0kv 10/1000s itu k.20/21/45 C 230vac, 10 itu k.20/21/45 C 600vac, 600 telcordia gr C 974- 283vac, 10a *devices should be independently evaluated and tested for use in any specifc application
www.littelfuse.com ?2006 littelfuse 250r series specifcations are subject to change without notice. electronics designers guide polyfuse ? resettable ptcs radial leaded environmental specifcations operating/storage temperature -40c to +85c maximum device surface temperature in tripped state 125c passive aging 65c/85c, 1000 hours humidity aging +85c, 85%r.h. 1000 hours thermal shock mil-std-202f method 107g +125c to -55c 10 times solvent resistance mil-std-202, method 215f physical specifcations lead material tin-plated copper soldering characteristics solderability per mil-std-202, method 208e insulating material cured, fame retardant epoxy polymer meets ul94v-0 requirements. device labeling marked with lf, voltage, current rating, and date code. soldering parameters - solder refow condition refow peak temp/ duration time 260c > 5 sec > 220c 30 sec ~ 60 sec preheat 160c ~ 190c 60 sec ~ 90 sec storage condition 0c~35c, < 70%rh ? recommended refow methods: ir, vapor phase oven, hot air oven, n 2 environment for lead-free. ? devices are not designed to be wave soldered to the bottom side of the board. ? devices can be cleaned using standard industry methods and solvents. note: if refow temperatures exceed the recommended profle, devices may not meet the performance requirements. preheatin g 160 19 0 220 260 0 30 to 60 t emperature ( c) soldering cooling 120 60 to 90 time(s ) soldering parameters - wave soldering condition wave soldering peak temp/ duration time 260c < 5 sec > 220c 2 sec ~ 20 sec preheat 140c ~ 180c 180 sec ~ 210 sec storage condition 0c~35c < 70%rh ? recommended soldering methods: heat element oven or n 2 environment for lead-free. ? devices are designed to be wave soldered to the bottom side of the board. ? devices can be cleaned using standard industry methods and solvents. ? this profle can be used for lead-free device note: if soldering temperatures exceed the recommended profle, devices may not meet the performance requirements. preheatin g 16 0 19 0 22 0 26 0 0 2 to 5 t emperature ( c) soldering coolin g 20-3 0 180 to 210 time(s )
www.littelfuse.com ?2006 littelfuse 250r series specifcations are subject to change without notice. 5 electronics designers guide polyfuse ? resettable ptcs radial leaded part marking system b b c a a figure 1 e d c e marking marking figure 2 d f f 250 080 xxxx vo ltage rating current rating date cod e (contact littelfuse for additional information ) littelfuse tr ademark vo ltage rating current ratin g date code (contact littelfuse for additional information) littelfuse tr ademar k 250 120 xxxx dimensions b b c a a figure 1 e d c e marking marking figure 2 d f f 250 080 xxxx vo ltage rating current rating date cod e (contact littelfuse for additional information ) littelfuse tr ademark vo ltage rating current ratin g date code (contact littelfuse for additional information) littelfuse tr ademar k 250 120 xxxx figure 2 figure part number a b c d e physical characteristics inches mm inches mm inches mm inches mm inches mm lead (dia) material figure max. max. max. max. max. max. min. min. typ. typ. inches mm 250r080 0.23 5.8 0.39 9.9 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 1 250r080t 0.23 5.8 0.39 9.9 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 1 250r120 0.26 6.5 0.43 11 0.15 3.8 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 2 250r120-ra 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 2 250r120-rc 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 2 250R120-RF 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 2 250r120-r1 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 2 250r120-r2 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 2 250r120-r3 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 2 250r120t 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 2 250r145 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 2 250r145-ra 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 2 250r145-rb 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 2 250r145t 0.26 6.5 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 2 250r180 0.37 9.5 0.47 12 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 1 250f180t 0.37 9.5 0.47 12 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 1
www.littelfuse.com ?2006 littelfuse 250r series specifcations are subject to change without notice. electronics designers guide polyfuse ? resettable ptcs radial leaded part numbering system pa ckaging st yle r: radial i hol d current code (see table below ) 250 r 120 - ra z r t: pre-tripped device (optional ) quantity code: m=1000 u=500 z=1200 serie s peak voltage rating blank: bulk r: tape & amm o rx: resistance range (x = a-z or 1-9) [not applicable for all parts] packaging i hold (a) i hold code packaging option quantity quantity & packaging codes 0.080 080 bulk 500 u tape and ammo 1500 dr 0.120 120 bulk 500 u tape and ammo 1200 zr 0.145 145 bulk 500 u tape and ammo 1200 zr 0.180 180 bulk 200 f tape and ammo 1000 mr
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