surface mount varistors 195 www.littelfuse.com transient voltage surge suppressor ch varistor series ch series transient surge suppressors are small, metal-oxide varistors (movs) manufactured in leadless chip form. they are intended for use in a variety of applications from low voltage dc to off-line board-level protection. these devices, which have significantly lower profiles than traditional radial-lead varistors, permit designers to reduce the size and weight and increase the reliability of their equipment designs. ch series varistors are available in a voltage range from 14v to 275v v m(ac)rms , and energy ratings up to 23j. see the littelfuse multilayer suppressor series also. features ?lead-free ?leadless, surface mount chip in 5 x 8mm size ?voltage ratings v m(ac)rms ,..................... .14v to 275v ?supplied in tape and reel or bulk pack ?no derating up to 125 o c ambient agency approvals: recognized under the components program of underwriters laboratories. agency file numbers: ul e75961, e135010. rohs pb 3 surface mount varistors
surface mount varistors 196 www.littelfuse.com transient voltage surge suppressor ch varistor series pa rt number maximum ratings (125 o c) specifications (25 o c) continuous transient varistor voltage at 1ma dc test current max clamping volt v c at test current (8/20 s) typical capaci- tance v rms v dc energy (10/1000 s) peak current (8/20 s) v m(ac) v m(dc) w tm i tm min v n(dc) max v c i p f = 1mhz (v) (v) (j) (a) (v) (v) (v) (v) (a) (pf) v22ch8 14 18 (note 3) 10.0 (note 2) 250 18.7 22.0 26.0 47 5 1600 v27ch8 17 22 1.0 250 23.0 27.0 31.1 57 5 1300 v33ch8 20 26 1.2 250 29.5 33.0 36.5 68 5 1100 v39ch8 25 31 1.5 250 35.0 39.0 43.0 79 5 900 v47ch8 30 38 1.8 250 42.0 47.0 52.0 92 5 800 v56ch8 35 45 2.3 250 50.0 56.0 62.0 107 5 700 v120ch8 75 102 6.0 500 108.0 120.0 132.0 200 10 300 ? v150ch8 95 127 8.0 500 135.0 150.0 165.0 250 10 250 ? v180ch8 115 153 10.0 500 162.0 180.0 198.0 295 10 200 ? v200ch8 130 175 11.0 500 184.0 200.0 228.0 340 10 180 ? v220ch8 140 180 12.0 500 198.0 220.0 242.0 360 10 160 ? V240CH8 150 200 13.0 500 212.0 240.0 268.0 395 10 150 ? v360ch8 230 300 20.0 500 324.0 360.0 396.0 595 10 100 ? v390ch8 250 330 21.0 500 354.0 390.0 429.0 650 10 90 ? v430ch8 275 369 23.0 500 389.0 430.0 473.0 710 10 80 notes: 1. power dissipation of transients not to exceed 0.25w. 2. energy rating for impulse duration of 30ms minimum to one half of peak current value. 3. also rated to withstand 24v for 5 minutes. ? v150 - v430 ch varistors are recognized under ul ?e #e75961 as a recognized component. v68ch8 40 56 3.0 250 61.0 68.0 75.0 127 10 600 absolute maximum ratings for ratings of individual members of a series, see device ratings and specifications chart continuous: steady state applied voltage: ac voltage range (v m(ac)rms ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 to 275 v dc voltage range (v m(dc) ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 to 369 v transient:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v peak pulse current (i tm ) for 8/20? current wave (see figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 to 500 a single pulse energy range for 10/1000? current wave (w tm ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 to 23 j operating ambient temperature range (t a ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 125 o c storage temperature range (t stg ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 150 o c temperature coefficient ( v) of clamping voltage (v c ) at specified test current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.01 %/ o c caution: stresses above those listed in ?bsolute maximum ratings may cause permanent damage to the device. this is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. device ratings and specifications ch series units pb rohs
surface mount varistors 197 www.littelfuse.com transient voltage surge suppressor ch varistor series power dissipation ratings continuous power dissipation capability is not an applicable design requirement for a suppressor, unless transients occur in rapid succession. under this condition, the average power dissipation required is simply the energy (watt-seconds) per pulse times the number of pulses per second. the power so developed must be within the specifications shown on the device ratings and specifications table for the specific device. furthermore, the operating values need to be derated at high tempera- tures as shown in figure 1. because varistors can only dissipate a relatively small amount of average power they are, therefore, not suitable for repetitive applications that involve substantial amounts of average power dissipation. figure 1. current, energy and power derating curve 100 90 80 70 60 50 40 30 20 10 0 -55 50 60 70 80 90 100 110 120 130 140 150 ambient temperature ( o c) percent of rated value figure 2. peak pulse current test waveform 100 90 50 10 o 1 t t 1 t 2 time percent of peak value o 1 = virtual origin of wave t = time from 10% to 90% of peak t 1 = virtual front time = 1.25 ?t t 2 = virtual time to half value (impulse duration) example: for an 8/20 s current waveform: 8 s = t 1 = virtual front time 20 s = t 2 = virtual time to half value figure 3. clamping voltage for v22ch8 - v68ch8 500 400 300 200 100 90 80 70 60 50 40 30 20 10 maximum peak volts (v) peak amperes (a) 10 -3 10 -2 10 -1 10 0 10 1 10 2 10 3 v56ch8 v47ch8 v39ch8 v33ch8 v27ch8 v22ch8 maximum clamping voltage model size 5 x 8mm 22 to 56v n(dc) rating t a = -55 o c to 125 o c v68ch8 figure 4. clamping voltage for v120ch8 - v430ch8 4,000 3,000 2,000 1,000 900 800 700 600 500 400 300 200 100 10 -3 10 -2 10 -1 10 0 10 1 10 2 10 3 10 4 v180ch8 v150ch8 v120ch8 v430ch8 v390ch8 v360ch8 V240CH8 v220ch8 v200ch8 peak amperes (a) maximum peak volts (v) maximum clamping voltage model size 5 x 8mm 100 to 430v n(dc) rating t a = -55 o c to 125 o c transient v-i characteristics curves pb rohs 3 surface mount varistors
surface mount varistors 198 www.littelfuse.com transient voltage surge suppressor ch varistor series recommended pad outline figure 5. surge current rating curves for v22ch8 - v56ch8 500 200 50 20 10 5 2 1 0.2 0.5 100 20 100 1,000 10,000 impulse duration ( s) surge current (a) 1 2 10 10 2 10 3 10 4 10 5 10 6 indefinite model size 5 x 8mm v22ch8 - v56ch8 pulse rating curves figure 6. surge current rating curves for v120ch8 - v430ch8 20 100 1,000 10,000 impulse duration ( s) 2,000 1,000 500 200 100 50 20 10 5 2 1 1 2 10 10 2 10 3 10 4 10 5 indefinite model size 5 x 8mm v120ch8 - v430ch8 10 6 surge current (a) note: if pulse ratings are exceeded, a shift of v n(dc ) (at specified current) of more than ?0% could result. this type of shift, which normally results in a decrease of v n(dc) , may result in the device not meeting the original published specifications, but it does not prevent the device from continuing to function, and to provide ample protection. mechanical dimensions e passivation contact area w l d note 1 c a b symbol inches millimeters min max min max d - 0.080 - 2.03 e 0.016 0.050 0.41 1.27 l 0.311 0.335 7.90 8.51 w 0.185 0.207 4.70 5.26 symbol inches millimeters a 0.402 10.21 b 0.216 5.50 c 0.087 2.21 note: avoid metal runs in this area. soldering recommendations: material - 62/36/2 sn/pb/ag or equivalent. temperature - 230 o c max., 5s. max. flux - r.m.a. pb rohs
surface mount varistors 199 www.littelfuse.com transient voltage surge suppressor ch varistor series standard packaging ch series varistors are always shipped in tape and reel.the standard 13in reel utilized contains 4000 pieces. note also that the ch series receives no branding on the chip itself. tape and reel specifications ?conforms to eia-481, revision a ?can be supplied to leg publication 286-3 special packaging option 1 - 7-inch reels containing 1000 pieces are available. to order 7in reels add a t suffix to the part number; e.g., v47ch8t. option 2 - for small quantities (less than 100 pieces) the units are shipped bulk pack. to order, add a s suffix to the part number; e.g., v47ch8s. ordering information b 0 d p 2 p p 0 a 0 d 1 e f w cross section (ref. plane for a 0 & b 0 ) t r 1 r 2 k 0 a 0 r 3 b 0 h 0 k 0 section thru cavity t 1 t k minimum bending radius r 4 cavity details reeled radius details plan view of strip symbol parameter size (mm) b 0 cavity length 8.5 0.1 a 0 cavity width 5.5 0.1 k 0 cavity depth 2.0 min. h 0 ref. plane for a 0 and b 0 +0.10 0.3 -0.05 r 1 , r 2 , r 3 tape cavity radii 0.5 max. t carrier tape thickness 1.0 max. t 1 cover tape thickness 0.1 max. e sprocket hole from edge 1.75 0.1 p 0 sprocket hole pitch 4.0 0.1 d sprocket hole diameter +0.1 1.5 -0.0 p 2 hole centre to component centre 2.0 0.15 r 4 min. bending radius 40.0 min. d 1 ejection hole diameter 1.5 min. k overall thickness 3.0 min. p pitch of component 8.0 0.1 f sprocket hole to ejection hole 7.5 0.1 w carrier tape width 16.0 0.3 v 220 ch 8 relative size indicator littelfuse varistor technology series designator nominal varistor voltage packaging options no letter: standard 13 inch reel t: 7 inch reel s: bulk pack x pb rohs 3 surface mount varistors
|
