99 revised: july 12, 2010 polyfuse ? resettable ptcs ? 2010 littelfuse, inc 250r series radial leaded > 250r series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/250r.html for current information. 250r series 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 speci?ed 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 3 14 22 33 xx 250r080t 0.08 0.16 250/60 3 1 0.35 3 15 22 33 xx 250r120 0.12 0.24 250/60 3 1 1 1.5 4 8 16 xx 250r120-ra 0.12 0.24 250/60 3 1 1 1.0 7 9 16 xx 250r120-rc 0.12 0.24 250/60 3 1 1 0.85 5.4 7.5 14 xx 250r120-rf 0.12 0.24 250/60 3 1 1 0.7 6 10.5 16 xx 250r120-r1 0.12 0.24 250/60 3 1 1 0.8 6 9 16 xx 250r120-r2 0.12 0.24 250/60 3 1 1 0.7 8 10.5 16 xx 250R120-R3 0.12 0.24 250/60 3 1 1 1 8 10 16 xx 250r120t 0.12 0.24 250/60 3 1 1 1.2 7 12 16 xx 250r145 0.145 0.29 250/60 3 1 1 2.5 3 6 14 xx 250r145-ra 0.145 0.29 250/60 3 1 1 5 3 5.5 12 xx 250r145-rb 0.145 0.29 250/60 3 1 1 2.5 4.5 6 14 xx 250r145t 0.145 0.29 250/60 3 1 1 2.0 5.4 7.5 14 xx 250r180 0.18 0.65 250/60 10 1.8 1 21 0.8 2.2 4 xx 250r180t 0.18 0.65 250/60 10 1.8 1 20 1.4 3.9 4.5 xx items with t at end of part number = pre-tripped device. see part ordering number system section of this data sheet for additio nal information. description features applications t o i p m e d v s s f o u range, 60vdc operating voltage t 7 " $ j o u f s s v q u s b u j o h t ' b t u u j n f o u p u s j q t # j o o f e b o e t p s u f e o b s s p x resistance ranges available t 3 p ) 4 d p n q m j b o u
- f b e free and halogen-free* t $ v t u p n f s 1 s f n j t f t equipment (cpe) t $ f o u s b m 0 g m d f $ 0
telecom centers t - " / 8 " / f r v j q n f o u t " d d f t t f r v j q n f o u 250r series agency approvals agency agency file number e183209 r50120008 i hold = hold current: maximum current device will pass without tripping in 23c still air. i trip = trip current: minimum current at which the device will trip in 23c 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 23c 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 speci?ed rating may result in damage and possible arcing and ?ame. * effective january 1, 2010, all 250r ptc products will be manufactured halogen free (hf). existing non-halogen free 250r ptc p roducts may continue to be sold, until supplies are depleted.
100 revised: july 12, 2010 polyfuse ? resettable ptcs ? 2010 littelfuse, inc. 250r series radial leaded > 250r series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/250r.html for current information. 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 10 20 30 40 5 0607080 10% 30% 5 0% 70% 90% 110 % 130% 1 5 0% 170% temperature (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. 0.01 0.1 1 10 100 1000 10000 100000 0.080a 0.120a 0.145a 0.180a 2 5 0r 0.1 1 10 100 current in amperes time in seconds
101 revised: july 12, 2010 polyfuse ? resettable ptcs ? 2010 littelfuse, inc 250r series radial leaded > 250r series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/250r.html for current information. 250r series protection application guide region/speci?cation 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 of?ce 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 speci?cation 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 speci?c application
102 revised: july 12, 2010 polyfuse ? resettable ptcs ? 2010 littelfuse, inc. 250r series radial leaded > 250r series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/250r.html for current information. environmental speci?cations 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 milCstdC202f, method 107g +125c to -55c 10 times solvent resistance milCstdC202, method 215f moisture sesitivity level level 1, jCstdC020c physical speci?cations lead material tin-plated copper soldering characteristics solderability per milCstdC202, method 208e insulating material cured, ?ame retardant epoxy polymer meets ul94v-0 requirements. device labeling marked with 'lf', voltage, current rating, and date code. soldering parameters - solder re?ow condition re?ow 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 t 3 f d p n n f o e f e s f n p x n f u i p e t * 3
w b q p s q i b t f p w f o
i p u air oven, n 2 environment for lead-free. t % f w j d f t b s f o p u e f t j h o f e u p c f x b w f t p m e f s f e u p u i f bottom side of the board. t % f w j d f t d b o c f d m f b o f e v t j o h t u b o e b s e j o e v t u s z n f u i p e t and solvents. note: if re?ow temperatures exceed the recommended pro?le, devices may not meet the performance requirements. preheating 160 190 220 260 0 30 to 60 temperature (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 t 3 f d p n n f o e f e t p m e f s j o h n f u i p e t i f b u f m f n f o u p w f o p s n 2 environment for lead-free. t % f w j d f t b s f e f t j h o f e u p c f x b w f t p m e f s f e u p u i f c p u u p n side of the board. t % f w j d f t d b o c f d m f b o f e v t j o h t u b o e b s e j o e v t u s z n f u i p e t and solvents. t 5 i j t q s p m m f d b o c f v t f e g p s m f b e g s f f e f w j d f note: if soldering temperatures exceed the recommended pro?le, devices may not meet the performance requirements. preheating 160 190 220 260 0 2 to 5 temperature (c) soldering cooling 20-30 180 to 210 time(s)
103 revised: july 12, 2010 polyfuse ? resettable ptcs ? 2010 littelfuse, inc 250r series radial leaded > 250r series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/250r.html for current information. 250r series part marking system 2 5 0 080 xxxx voltage rating current rating date code (contact littelfuse for additional information) littelfuse t rademark voltage rating current rating date code (contact littelfuse for additional information) littelfuse t rademark 2 5 0 120 xxxx dimensions b b c a a e d c e d f f 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 0.26 6.5 0.43 11 0.15 3.8 0.19 4.7 0.20 5.1 0.026 0.65 sn/cu 250r120-ra 2 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 250r120-rc 2 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 250r120-rf 2 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 250r120-r1 2 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 250r120-r2 2 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 250R120-R3 2 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 250r120t 2 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 250r145 2 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 250r145-ra 2 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 250r145-rb 2 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 250r145t 2 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 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
104 revised: july 12, 2010 polyfuse ? resettable ptcs ? 2010 littelfuse, inc. 250r series radial leaded > 250r series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/250r.html for current information. part ordering number system packaging style r: radial i hold current code (see table below) 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] 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
105 revised: july 12, 2010 polyfuse ? resettable ptcs ? 2010 littelfuse, inc 250r series radial leaded > 250r series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/250r.html for current information. 250r series dimension eia mark iec mark dimensions dim. (mm) tol. (mm) carrier tape width ww 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) hh 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 ll 11 max. protrusion beyond holdCdown tape l 2 l 2 not speci?ed 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 tt 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 ff 5.1 C/+ 0.7 *differs from eia specification tape and ammo speci?cations 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 figure 1
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