varistor products ?2010 littelfuse, inc. revision: august 30, 2010 ch varistor series surface mount varistors > ch series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/ch.html for current information. ch series ch varistor series rohs description ch series transient surge suppressors are small, met al-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 signi?cantly lower pro?les 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 8j. see the littelfuse multilayer suppressor series also. features t - f b e o g s f f t - f b e m f t t
t v s g b d f mount chip in 5 x 8mm size t 7 p m u b h f s b u j o h t v m(ac)rms 14v to 275v t 4 v q q m j f e j o u b q f b o e reel or bulk pack t / p e f s b u j o h v q u p 125oc ambient agency approvals absolute maximum ratings t ' p s s b u j o h t p g j o e j w j e v b m n f n c f s t p g b t f s j f t
t f f % f w j d f 3 b u j o h t b o e 4 q f d j m d b u j p o t d i b s u continuous ch series units 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: peak pulse current (i tm ) for 8/20 s current (see figure 2) 100 to 250 a single pulse energy range for 10/1000 s current wave (w tm ) 1.0 to 8.0 j operating ambient temperature range (t a ) -55 to +125 oc storage temperature range (t stg ) -55 to +150 oc temperature coefficient ( d v) of clamping voltage (v c ) at specified test current <0.01 %/oc caution: stresses above those listed in "absolute 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 speci?cation is not implied. agency agency file number ul e320116 recognized under the components program of underwriters laboratories.
varistor products ?2010 littelfuse, inc. revision: august 30, 2010 ch varistor series surface mount varistors > ch series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/ch.html for current information. part number maximum ratings (125oc) speci?cations (25oc) continuous transient varistor voltage at 1 ma dc test current max clamping volt v c at test current (8/20 s) typical capacitance v rms v dc energy (10/1000 s) peak current (8/20s) 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) 1.0 (note2) 100 18.7 22.0 26.0 47 5 1600 v27ch8 17 22 1.0 100 23.0 27.0 31.1 57 5 1300 V33CH8 20 26 1.0 100 29.5 33.0 36.5 68 5 750 v39ch8 25 31 1.0 100 35.0 39.0 43.0 79 5 700 v47ch8 30 38 1.2 100 42.0 47.0 52.0 92 5 650 v56ch8 35 45 1.4 100 50.0 56.0 62.0 107 5 600 v68ch8 40 56 1.5 100 61.0 68.0 75.0 127 10 500 v120ch8 75 102 2.0 250 108.0 120.0 132.0 200 10 300 v150ch8 95 127 3.0 250 135.0 150.0 165.0 250 10 250 v180ch8 115 153 4.0 250 162.0 180.0 198.0 295 10 120 v200ch8 130 175 4.0 250 184.0 200.0 228.0 340 10 110 v220ch8 140 180 5.0 250 198.0 220.0 242.0 360 10 105 v240ch8 150 200 5.0 250 212.0 240.0 268.0 395 10 100 v360ch8 230 300 6.0 250 324.0 360.0 396.0 595 10 70 v390ch8 250 330 7.0 250 354.0 390.0 429.0 650 10 60 v430ch8 275 369 8.0 250 389.0 430.0 473.0 710 10 50 device ratings and speci?cations 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. 4. all littelfuse ch series varistors are recognized under ul ?le #e320116 as a recognized component. 5. the typical capacitance is for reference only current, energy and power derating curve continuous power dissipation capability is not an applicable design requirement f or 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 speci?cations shown on the device ratings and speci?cations table for the speci?c device. furthermore, the operating values need to be derated at high tempera tures as shown in this diagram. 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. 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 1
varistor products ?2010 littelfuse, inc. revision: august 30, 2010 ch varistor series surface mount varistors > ch series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/ch.html for current information. ch series 100 90 50 10 o 1 t t 1 t 2 time percent of peak value peak pulse current test waveform clamping voltage for v120ch8 C v430ch8 clamping voltage for v22ch8 C 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 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 note: if pulse ratings are exceeded, a shift of v n(dc) (at speci?ed current) of more than +/-10% 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 speci?cations, but it does not prevent the device from continuing to function, and to provide ample protection. 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 surge current (a) 1 2 10 10 2 10 3 10 4 10 5 10 6 indefinite model size 5 x 8mm v22ch8 - v56ch8 (s) 20 100 1,000 10,000 impulse duration 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) (s) pulse rating curves 0 1 = virtual origin of wave t = time from 10% to 90% of peak t 1 = rise time = 1.25 x t t 2 = decay time example: for an 8/20 s current waveform: 8 s = t 1 = rise time 20 s = t 2 = decay time surge current rating curves for v120ch8 - v430ch8 figure 2 figure 3 figure 4 figure 5 figure 6
varistor products ?2010 littelfuse, inc. revision: august 30, 2010 ch varistor series surface mount varistors > ch series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/ch.html for current information. lead (pb) soldering recommendations the principal techniques used for the soldering of components in surf ace mount tec hnology are ir re-?ow and wave soldering. typical pro?les are shown on the right. ch series devices have silver - platinum terminals (ag/pt), and the recommended solder is 62/36/2 (sn/pb/ag), 60/40 (sn/pb) or 63/37 (sn/pb). littelfuse also recommends an rma solder ?ux. wave soldering is the most strenuous of the processes. to avoid the possibility of generating stresses due to thermal shock, a preheat stage in the soldering process is recommended, and the peak temperature of the solder process should be rigidly controlled. when using a re?ow process, care should be taken to ensure that the ch chip is not subjected to a thermal gradient steeper than 4 degrees per second; the ideal gradient being 2 degrees per second. during the soldering process, preheating to within 100 degrees of the solder's peak temperature is essential to minimize thermal shock. once the soldering process has been completed, it is still necessary to ensure that any further thermal shocks are avoided. one possible cause of thermal shock is hot printed circuit boards being removed from the solder process and subjected to cleaning solvents at room temperature. the boards must be allowed to cool gradually to less than 50oc before cleaning. leadCfree (pb-free) soldering recommendations ch series devices have silver - platinum terminals (ag/pt), and the recommended l ead-free solder is 96.5/3.0/0.5 (sna gcu) with an rma ?ux, though there is a wide selection of pastes and ?uxes available that should be compatible. the re?ow pro?le must be constrained by the maximums in the leadCfree re?ow pro?le. for leadCfree wave soldering, the wave solder pro?le still applies. note: the leadCfree paste, ?ux and pro?le were used for evaluation purposes by littelfuse, based upon industry standards and practices. there are multiple choices of all three available, it is advised that the customer explores the optimum combination for their process as processes vary considerably from site to site. preheat zone preheat dwell ramp rate <2c/s maximum temperature 230c temperature c time (minutes) 250 200 150 100 50 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 40-80 seconds above 183c time (minutes) 300 250 200 150 100 50 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 maximum wave 260c second preheat first preheat temperature c maximum temperature 260?c, time within 5?c of peak 20 seconds maximum preheat zone ramp rate <3?c/s 60 - 150 sec > 217?c temperature c time (minutes) 300 250 200 150 100 50 0 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 re?ow solder pro?le wave solder pro?le leadCfree re-?ow solder pro?le figure 7 figure 8 figure 9
varistor products ?2010 littelfuse, inc. revision: august 30, 2010 ch varistor series surface mount varistors > ch series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/ch.html for current information. ch series dimensions note 1 c a b e l w d symbol inches millimeters min max min max a 0.402 10.210 b 0.216 5.500 c 0.087 2.210 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 pad layout dimensions chip layout dimensions part numbering system v 220 ch 8 relative size indicator littelfuse varistor series designator nominal varistor voltage packaging options no letter: standard 13 inch reel t: 7 inch reel s: bulk pack x note: avoid metal runs in this area. soldering recommendations: material - 62/36/2 sn/pb/ ag or equivalent.temperature C 230oc max., 5s. max. flux - r.m.a.
varistor products ?2010 littelfuse, inc. revision: august 30, 2010 ch varistor series surface mount varistors > ch series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/ch.html for current information. notes : t $ p o g p s n t u p & * "
3 f w j t j p o " t $ b o c f t v q q m j f e u p * & $ 1 v c m j d b u j p o standard packaging* ch series varistors are al ways shipped in tape and reel. the standard 13-inch reel utilized contains 4000 pieces. note also that the ch series receives no branding on the chip itself. *note: it is recommended that parts be kept in the sealed bag provided and that parts be used as soon as possible when removed from bags. special packaging option 1 7 -inch reels containing 1000 pieces are available. to order 7-inch reels add a 't' suf?x 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' suf?x to the part number; e.g., v47ch8s. 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 a0 and b0 + 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 30.5 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 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 tape and reel speci?cations
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