? 2017 littelfuse, inc. specifcations are subject to change without notice. revised: 03/22/17 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 typ. (w) maximum time to trip resistance agency approvals current (a) time (sec.) r min () r typ () r 1max () 250R080 0.08 0.16 250/60 3 1 0.35 4.0 14 22 33 x x 250R080t 0.08 0.16 250/60 3 1 0.35 4.0 15 22 33 x x 250r120 0.12 0.24 250/60 3 1 1 2.5 4 8 16 x x 250r120-ra 0.12 0.24 250/60 3 1 1 2.5 7 9 16 x x 250r120-rc 0.12 0.24 250/60 3 1 1 3.0 5.4 7. 5 14 x x 250r120-rf 0.12 0.24 250/60 3 1 1 2.5 6 10.5 16 x x 250r120-r1 0.12 0.24 250/60 3 1 1 2.5 6 9 16 x x 250r120-r2 0.12 0.24 250/60 3 1 1 2.5 8 10.5 16 x x 250r120-r3 0.12 0.24 250/60 3 1 1 2.5 8 10 16 x x 250r120t 0.12 0.24 250/60 3 1 1 2.5 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 2.5 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 2.5 5.4 7. 5 14 x x 250r180 0.18 0.65 250/60 10 1. 8 1 20 0.8 2.2 4 x x 250r180t 0.18 0.65 250/60 10 1. 8 1 21 1. 4 3.9 4.5 x x items with t at end of part number = pre-tripped device. see part ordering number system section of this data sheet for additional information. description features applications ? 0.08 C 0.18 hold current range, 60vdc operating voltage ? 250vac interrupt rating ? fast timeCto-trip ? binned and sorted narrow resistance ranges available ? rohs compliant, lead- free and halogen-free* ? customer premises equipment (cpe) ? central offce (co)/ telecom centers ? lan/wan equipment ? access equipment agency approvals i hold = hold current: maximum current device will pass without tripping in 20c still air. i trip = trip current: minimum current at which the device will trip in 20c still air. v int = maximum voltage the device can withstand without damage at rated current (i max) v op = the device regular operation voltage i max = maximum fault current device can withstand without damage at rated voltage (v max ) p d = power dissipated from device when in the tripped state at 20c still air. r min = minimum resistance of device in initial (un-soldered) state. r typ = typical resistance of device in initial (un-soldered) state. r 1max = maximum resistance of device at 20c measured one hour after tripping. caution: operation beyond the specifed rating may result in damage and possible arcing and fame. * effective january 1, 2010, all 250r ptc products will be manufactured halogen free (hf). existing non-halogen free 250r ptc products may continue to be sold, until supplies are depleted. rohs * 250r series agency agency file number e183209 r 50120008 poly-fuse ? resettable ptcs radial leaded > 250r series
? 2017 littelfuse, inc. specifcations are subject to change without notice. revised: 03/22/17 ambient operation temperature -40c -20c 0c 20c 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 -1 00 10 20 30 40 50 60 70 80 10 % 30% 50% 70% 90% 11 0% 1 30% 1 50% 1 70% t emperature (c) percentage of rated current average time current curves 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. note: typical temperature rerating curve, refer to table for derating data 0.01 0. 1 1 10 100 1000 10000 100000 0. 11 10 100 f ault cur r ent in a mper es resistance (ohm ) a b c d curve designation i hold (a) a 0.18 b 0.145 c 0.12 d 0.80 additional information ataseet samples resources samples poly-fuse ? resettable ptcs radial leaded > 250r series
? 2017 littelfuse, inc. specifcations are subject to change without notice. revised: 03/22/17 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 poly-fuse ? resettable ptcs radial leaded > 250r series
? 2017 littelfuse, inc. specifcations are subject to change without notice. revised: 03/22/17 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 milCstdC202, method 107 +125c to -55c 10 times solvent resistance milCstdC202, method 215 moisture sesitivity level level 1, jCstdC020 physical specifcations lead material tin-plated copper soldering characteristics solderability per milCstdC202, method 208 insulating material cured, fame retardant epoxy polymer meets ul94v-0 requirements. device labeling marked with 'lf', voltage, current rating, and date code. 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. preheating 160 19 0 220 260 0 2 to 5 t emperature ( c) soldering cooling 20-30 180 to 210 time(s) disclaimer notice - information furnished is believed to be accurate and reliable. however, users should independently evaluate the suitability of and test each product selected for their own applications. littelfuse products are not designed for, and may not be used in, all applications. read complete disclaimer notice at www.littelfuse.com/disclaimer-electronics . poly-fuse ? resettable ptcs radial leaded > 250r series
? 2017 littelfuse, inc. specifcations are subject to change without notice. revised: 03/22/17 part marking system b b c a a figure 1 e d c e figure 2 d f f 250 080 xxxx vo lt age rating current rating date code (conta ct lit telfuse f or additional inf ormation) lit telfuse t rademark vo lt age rating current rating date code (conta ct lit telfuse f or additional inf ormation) lit telfuse t rademark 250 12 0 xxxx dimensions b b c a a figure 1 e d c e figure 2 d f f 250 080 xxxx vo lt age rating current rating date code (conta ct lit telfuse f or additional inf ormation) lit telfuse t rademark vo lt age rating current rating date code (conta ct lit telfuse f or additional inf ormation) lit telfuse t rademark 250 12 0 xxxx figure 2 figure 1 part number figure a b c d e physical characteristics inches mm inches mm inches mm inches mm inches mm lead (dia) material max. max. max. max. max. max. min. min. typ. typ. inches mm 250R080 1 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 250R080t 1 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 250r120 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 250r120-ra 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 250r120-rc 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 250r120-rf 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 250r120-r1 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 250r120-r2 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 250r120-r3 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 250r120t 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 250r145 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 250r145-ra 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 250r145-rb 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 250r145t 2 0.27 6.8 0.43 11 0.18 4.6 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 250r180 1 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 250r180t 1 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 warning ? users shall independently assess the suitability of these devices for each of their applications ? operation of these devices beyond the stated maximum ratings could result in damage to the devices and lead to electrical arcing and/or fre ? these devices are intended to protect against the effects of temporary over-current or over-temperature conditions and are not intended to perform as protective devices where such conditions are expected to be repetitive or prolonged in duration ? exposure to silicon-based oils, solvents, electrolytes, acids, and similar materials can adversely affect the performance of these pptc devices ? these devices undergo thermal expansion under fault conditions, and thus shall be provided with adequate space and be protected against mechanical stresses ? circuits with inductance may generate a voltage (l di/dt) above the rated voltage of the pptc device. poly-fuse ? resettable ptcs radial leaded > 250r series
? 2017 littelfuse, inc. specifcations are subject to change without notice. revised: 03/22/17 part ordering number system pa ckaging st yle r: radial i hold current code 250 r 120 - ra z r t: pre-tripped device (optional) quantity code: f=200 m=1000 u=500 z=1200 series peak voltage rating blank: bulk r: tape & ammo rx: resistance range (x = a-z or 1-9) [not applicable for all parts] (refer to packaging or electrical characteristics tables) packaging part number ordering number i hold (a) i hold code packaging option quantity quantity & packaging codes 250R080 250R080u 0.080 080 bulk 500 u 250R080zr tape and ammo 1200 zr 250R080t 250R080tu 0.080 080 bulk 500 u 250R080tzr tape and ammo 1200 zr 250r120 250r120u 0.120 120 bulk 500 u 250r120zr tape and ammo 1200 zr 250r120-ra 250r120-rau 0.120 120 bulk 500 u 250r120-razr tape and ammo 1200 zr 250r120-rc 250r120-rcu 0.120 120 bulk 500 u 250r120-rczr tape and ammo 1200 zr 250r120-rf 250r120-rfu 0.120 120 bulk 500 u 250r120-rfzr tape and ammo 1200 zr 250r120-r1 250r120-r1u 0.120 120 bulk 500 u 250r120-r1zr tape and ammo 1200 zr 250r120-r2 250r120-r2u 0.120 120 bulk 500 u 250r120-r2zr tape and ammo 1200 zr 250r120-r3 250r120-r3u 0.120 120 bulk 500 u 250r120-r3zr tape and ammo 1200 zr 250r120t 250r120tu 0.120 120 bulk 500 u 250r120tzr tape and ammo 1200 zr 250r145 250r145u 0.145 145 bulk 500 u 250r145zr tape and ammo 1200 zr 250r145-ra 250r145-rau 0.145 145 bulk 500 u 250r145-razr tape and ammo 1200 zr 250r145-rb 250r145-rbu 0.145 145 bulk 500 u 250r145-rbzr tape and ammo 1200 zr 250r145t 250r145tu 0.145 145 bulk 500 u 250r145tzr tape and ammo 1200 zr 250r180 250r180f 0.180 180 bulk 200 f 250r180mr tape and ammo 1000 mr 250r180t 250r180tf 0.180 180 bulk 200 f 250r180tmr tape and ammo 1000 mr poly-fuse ? resettable ptcs radial leaded > 250r series
? 2017 littelfuse, inc. specifcations are subject to change without notice. revised: 03/22/17 dimension eia mark iec mark dimensions dim. (mm) tol. (mm) carrier tape width w w 18 C0.5 / +1.0 hold down tape width w 4 w 0 11 min. top distance between tape edges w 6 w 2 3 max. sprocket hole position w 5 w 1 9 C0.5 / +0.75 sprocket hole diameter* d 0 d 0 4 C0.32 / +0.2 abscissa to plane (straight lead) h h 18.5 C/+ 3.0 abscissa to plane (kinked lead) h 0 h 0 16 C/+ 0.5 abscissa to top h 1 h 1 32.2 max. overall width without lead protrusion c 1 42.5 max. overall width with lead protrusion c 2 43.2 max. lead protrusion l 1 l 1 1. 0 max. protrusion of cut out l l 11 max. protrusion beyond holdCdown tape l 2 l 2 not specifed sprocket hole pitch: 250R080C250r145 p 0 p 0 12.7 C/+ 0.3 sprocket hole pitch: 250r180 p 0 p 0 25.4 C/+ 0.5 pitch tolerance 20 consecutive. C/+ 1 device pitch: 250R080C250r145 12.7 device pitch: 250r180 25.4 tape thickness t t 0.9 max. tape thickness with splice t 1 2.0 max. splice sprocket hole alignment 0 C/+ 0.3 body lateral deviation h h 0 C/+ 1.0 body tape plane deviation p p 0 C/+ 1.3 ordinate to adjacent component lead* p 1 p 1 3.81 C/+ 0.7 lead spacing f f 5.1 C/+ 0.7 *differs from eia specification tape and ammo specifcations devices taped using eia468-b/ie286-2 standards. see table below and figure 1 for details. tape and ammo diagram a b a 1 l 1 p 0 d 0 f l w 4 h 0 i 2 h 1 w 5 w reference plane ?h ?h h 1 h c 1 c 2 ?h ?p direction of unreeling cross section a - b t cross section optional shape: circular or polygonal direction of unreeling reel tape upper side lower side w 1 w 2 figure 1 poly-fuse ? resettable ptcs radial leaded > 250r series
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