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surface mount varistors 168 www.littelfuse.com multilayer transient voltage surge suppressors size ml varistor series the ml series family of transient voltage surge suppression devices is based on the littelfuse multilayer fabrication technology. these compo- nents are designed to suppress a variety of transient events, including those specified in iec 61000-4-2 or other standards used for electromagnetic compliance (emc). the ml series is typically applied to protect integrated circuits and other components at the circuit board level. the wide operating voltage and energy range make the ml series suit- able for numerous applications on power supply, control and signal lines. the ml series is manufactured from semiconducting ceramics, and is supplied in a leadless, surface mount package. the ml series is compat- ible with modern reflow and wave soldering procedures. it can operate over a wider temperature range than zener diodes, and has a much smaller footprint than plastic-housed components. littelfuse inc. manufactures other multilayer series products. see the mle series data sheet for esd applications, mhs series data sheet for high-speed esd applications, the mln for multiline protection and the auml series for automotive applications. features ?rohs compliant ?leadless 0402, 0603, 0805, 1206 and 1210 chip sizes ?multilayer ceramic construction technology ?55 o c to +125 o c operating temperature range operating voltage range v m(dc) = 5.5v to 120v ?rated for surge current (8 x 20?) ?rated for energy (10 x 1000?) ?inherent bi-directional clamping ?no plastic or epoxy packaging assures better than 94v-0 flammability rating ?standard low capacitance types available applications ?suppression of inductive switching or other transient events such as eft and surge voltage at the circuit board level ?esd protection for components sensitive to iec 61000-4-2, mil-std-883c method 3015.7, and other industry specifications (see also the mle or mln series) provides on-board transient voltage protection for ics and transistors ?used to help achieve electromagnetic compliance of end products ?replace larger surface mount tvs zeners in many applications metric eia 1005 0402 1608 0603 2012 0805 3216 1206 3225 1210 4532 1812 5650 2220 rohs
170 www.littelfuse.com multilayer transient voltage surge suppressors absolute maximum ratings for ratings of individual members of a series, see device ratings and specifications table. continuous: steady state applied voltage: dc voltage range (v m(dc) ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 to 120 v ac voltage range (v m(ac)rms ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 to 107 v transient: non-repetitive surge current, 8/20s waveform, (i tm ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 to 500 a non-repetitive surge energy, 10/1000s waveform, (w tm ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.02 to 1.2 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 device ratings and specifications ml series units ml varistor series part number maximum ratings (125 o c) specifications (25 o c) maximum continuous working voltage maximum non- repetitive surge current (8/20 s) maximum non- repetitive surge energy (10/1000 maximum clamping voltage at 1a (or as no ted) (8/20 nominal voltage at 1ma dc test current typical cap a cit ance at f = 1mhz v m(dc) v m(ac) i tm w tm v c v n(dc) min v n(dc) max c (v) (v) (a) (j) (v) (v) (v) (pf) v3.5mla0603 3.5 2 .5 30 0.1 13 13 13 19 38 17.5 17.5 17.5 17.5 30 35 25.5 25.5 29 38 34.5 32 32 32 13 3.7 7 .0 1270 v3.5mla0805 3.5 2 .5 120 0.3 3.7 7 .0 2530 v3.5mla0805l 3.5 2 .5 40 0.1 3.7 7 .0 1380 v3.5mla1206 3.5 2.5 100 0.3 3.7 7.0 6000 v5.5mla0402 5.5 4.0 20 0.050 7.1 10.8 220 v9mla0402 9 6.5 20 0.050 11 16 120 v9mla0402l 9 6.5 4 0.020 11 16 33 v14mla0402 14 10 20 0.050 15.9 21.5 70 v5.5mla0603 5.5 4 .0 30 0.1 7.1 9 .3 760 v5.5mla0805 5.5 4 .0 120 0.3 7.1 9 .3 1840 v5.5mla0805l 5.5 4 .0 40 0.1 7.1 9 .3 990 v5.5mla1206 5.5 4.0 150 0.4 7.1 9.3 3500 v9mla0603 9.0 6 .5 30 0.1 11 16 490 v9mla0805l 9.0 6 .5 40 0.1 11 16 520 v12mla0805l 12 9.0 4 0 0 .1 14 18.5 410 v14mla0603 14 10 30 0.1 15.9 21.5 180 v14mla0805 14 10 120 0.3 15.9 20.3 560 v14mla0805l 14 10 40 0.1 15.9 20.3 320 v14mla1206 14 10 150 0.4 15.9 20.3 1400 v5.5mla0402l 5.5 4.0 20 0.050 15.9 21.5 70 s) s) rohs
171 www.littelfuse.com 3 surface mount varistors multilayer transient voltage surge suppressors ml varistor series device ratings and specifications (continued) v18mla0603 18 14 30 0.1 22 28.0 120 v18mla0402 18 14 20 0.050 50 50 44 44 44 60 60 60 60 74 72 75 92 22 28.0 40 v18mla0805 18 14 120 0.3 22 28.0 520 v18mla0805l 18 14 40 0.1 22 28.0 290 v18mla1206 18 14 150 0.4 22 28.0 1270 v18mla1210 18 14 500 2.5 44 at 2.5a 60 at 2.5a 68 at 2.5a 68 at 2.5a 105 at 2.5a 105 at 2.5a 130 at 2.5a 180 at 2.5a 260 at 2.5a 22 28.0 1440 v26mla0603 26 20 30 0.1 31 38 110 v26mla0805 26 20 100 0.3 29.5 38.5 220 v26mla0805l 26 20 40 0.1 29.5 38.5 140 v26mla1206 26 20 150 0.6 29.5 38.5 600 v26mla1210 26 20 300 1.2 29.5 38.5 1040 v30mla0603 30 25 30 0.1 37 46 90 v30mla0805l 30 25 30 0.1 37 46 90 v30mla1210 30 25 280 1.2 35 43 1820 v30mla1210l 30 25 220 0.9 35 43 1760 v33mla1206 33 26 180 0.8 38 49 500 v42mla1206 42 30 180 0.8 46 60 425 v48mla1210 48 40 250 1.2 54.5 66.5 520 v48mla1210l 48 40 220 0.9 54.5 66.5 500 v56mla1206 56 40 180 1.0 120 140 61 77 180 v60mla1210 60 50 250 1.5 67 83 440 v68mla1206 68 50 180 1.0 76 90 100 v85mla1210 85 67 250 2.5 95 115 260 v120mla1210 120 107 125 2.0 135 165 80 no tes: 1. 2. 3. part number maximum ratings (125 o c) specifications (25 o c) maximum continuous working voltage maximum n o n- non- repetitive repetitive surge current (8/20 maximum non- repetitive surge energy (10/1000 maximum clamping voltage at 1a (or as no ted) (8/20 nominal voltage at 1ma dc test current typical cap a cit ance at f = 1mhz v m(dc) v m(ac) i tm w tm v c v n(dc) min v n(dc) max c (v) (v) (a) (j) (v) (v) (v) (pf) l suffix is a low capacitance and energy version; contact your littelfuse sales representative for custom capacitance requireme nts. typical leakage at 25 c<25 a, maximum leakage 100 a at v ; for 0402 size, typical leakage <5 a, maximum leakage <20 a at v o m(dc) m(dc). average power dissipation of transients for 0402, 0603, 0805, 1206 and 1210 sizes not to exceed 0.03w, 0.05w, 0.1w, 0.1w and 0. 15w respectively. s) s) s) rohs
surface mount varistors 171 www.littelfuse.com multilayer transient voltage surge suppressors temperature de-rating when transients occur in rapid succession, the average power dissipa- tion is 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. for applications exceeding 125 o c ambient temperature, the peak surge current and energy ratings must be derated as shown in figure 1. ml varistor series 3 surface mount varistors 100 80 60 40 20 0 -55 50 60 70 80 90 100 110 120 130 140 150 percent of rated value ambient temperature ( o c) figure 1. peak current and energy derating curve t 1 t 2 100 50 0 o 1 time percent of peak value o 1 = virtual origin of wave t 1 = virtual front time = 1.25 x t (impulse duration) t = time from 10% to 90% of peak t 2 = virtual time to half value 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 2. peak pulse current test waveform for clamping voltage t figure 3. limit v-i characteristic for v5.5mla0402 to v18mla0402 rohs mla0402 limit vi curves 1 10 100 0.000001 0.00001 0.0001 0.001 0.01 0.1 1 10 100 current (a) v18mla0402 v14mla0402 v9mla0402 v5.5mla0402 varistor voltage (v)
surface mount varistors 172 www.littelfuse.com multilayer transient voltage surge suppressors ml varistor series maximum transient v-i characteristic curves figure 5. limit v-i characteristic for v3.5mla0603 to v30mla0603 1 10 100 1000 0.00001 0.0001 0.001 0.01 0.1 1 10 100 current (a) v30mla0603 v26mla0603 v18mla0603 v14mla0603 v9mla0603 v5.5mla0603 v3.5mla0603 varistor voltage (v) 1 10 100 1000 0.00001 0.0001 0.001 0.01 0.1 1 10 100 v5.5mla0805l v3.5mla0805l v9mla0805l v12mla0805l v14mla0805l v18mla0805l v26mla0805l v30mla0805l figure 6. limit v-i characteristic for v3.5mla0805l to v30mla0805l varistor voltage (v) current (a) figure 4. limit v-i characteristic for v9mla0402l rohs 1 10 100 0.000001 0.00001 0.0001 0.001 0.01 0.1 1 10 100 current (a) v9mla0402l v5.5mla0402l varistor voltage (v) mla0402l limit vi curves
surface mount varistors 173 www.littelfuse.com multilayer transient voltage surge suppressors maximum transient v-i characteristic curves (continued) ml varistor series 3 surface mount varistors 1 10 100 1000 0.00001 0.0001 0.001 0.01 0.1 1 10 100 1000 v5.5mla0805 v3.5mla0805 v14mla0805 v18mla0805 v26mla0805 figure 7. limit v-i characteristic for v3.5mla0805 to v26mla0805 varistor voltage (v) current (a) figure 9. limit v-i characteristic for v18mla1210 to v120mla1210 1ma 100 10 1 a current (a) varistor voltage (v) 10 a 100 a 10ma 100ma 1a 10a 100a 1000a maximum clamping voltage maximum leakage 1000 1 v60mla1210 v85mla1210 v120mla1210 v48mla1210, v48mla1210l v30mla1210, v30mla1210l v26mla1210 v18mla1210 1 10 100 1000 0.00001 0.0001 0.001 0.01 0.1 1 10 100 1000 current (a) v68mla1206 v56mla1206 v42mla1206 v33mla1206 v26mla1206 v18mla1206 v14mla1206 v5.5mla120 6 v3.5mla120 6 varistor voltage (v) figure 6. limit v-1 characteristic for v3.5mla1206 to v68mla1206 rohs
surface mount varistors 174 www.littelfuse.com multilayer transient voltage surge suppressors ml varistor series device characteristics at low current levels, the v-i curve of the multilayer transient voltage suppressor approaches a linear (ohmic) relationship and shows a temperature dependent effect (figure 10). at or below the maximum working voltage, the suppressor is in a high resistance mode (approach- ing 10 6 ? at its maximum rated working voltage). leakage currents at maximum rated voltage are below 50?, typically 25?; for 0402 size below 10?, typically 5?. speed of response the multilayer suppressor is a leadless device. its response time is not limited by the parasitic lead inductances found in other surface mount packages. the response time of the zinc oxide dielectric material is less than 1 nanosecond and the ml can clamp very fast dv/dt events such as esd. additionally, in ?eal world applications, the associated circuit wiring is often the greatest factor effecting speed of response. therefore, transient suppressor placement within a circuit can be considered important in certain instances. energy absorption/peak current capability energy dissipated within the ml is calculated by multiplying the clamping voltage, transient current and transient duration. an important advantage of the multilayer is its interdigitated electrode construction within the mass of dielectric material. this results in excellent current distribution and the peak temperature per energy absorbed is very low. the matrix of semicon- ducting grains combine to absorb and distribute transient energy (heat) (figure 11). this dramatically reduces peak temperature; thermal stresses and enhances device reliability. as a measure of the device capability in energy and peak current handling, the v26mla1206a part was tested with multiple pulses at its peak current rating (150a, 8/20?). at the end of the test, 10,000 pulses later, the device voltage characteristics are still well within specification (figure 13). 100% 1e -9 1e -8 suppressor current (a dc ) 10% 1e -7 1e -6 1e -5 1e -4 1e -3 1e -2 25 50 75 100 125 o c suppressor voltage in percent of v nom value a t 25 o c (%) figure 10. typical temperature dependance of the characteristic curve in the leakage region o o o o grains depletion fired ceramic dielectric region metal electrodes depletion region metal end termination figure 11. multilayer internal construction 100 10 20 v26mla1206 40 60 80 100 120 140 temperature ( o c) clamping voltage (v) v5.5mla1206 0 -20 -40 -60 figure 12. clamping voltage over temperature (v c at 10a) 100 10 0 v26mla1206 2000 4000 6000 8000 10000 12000 number of pulses vo ltag e figure 13. repetitive pulse capability peak current = 150a 8/20 s duration, 30s between pulses rohs
176 www.littelfuse.com multilayer transient voltage surge suppressors soldering recommendations lead (pb) soldering recommendations the principal techniques used for the soldering of components in surface mount technology are ir re-flow & wave soldering. typical profiles are shown in figures 14 & 15 the termination options available for each solder technique are: reflow wave 1. nickel barrier (preferred) 1. nickel barrier (preferred) 2. silver/platinum 2. silver/palladium the recommended solder for the ml suppressor is a 62/36/2 (sn/pb/ag), 60/40 (sn/pb) or 63/37 (sn/pb). littelfuse also recommends an rma solder flux. 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 reflow process, care should be taken to ensure that the ml 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 50?c before cleaning. lead-free (pb-free) soldering recommendations littelfuse offers the nickel-barrier termination finish for the optimum pb- free solder performance. the preferred solder is 96.5/3.0/0.5 (snagcu) with an rma flux, but there is a wide selection of pastes & fluxes available with which the nick- el barrier parts should be compatible. the reflow profile must be constrained by maximums shown in figure16. for pb-free wave soldering, figure 15 still applies. note: the pb-free paste, flux & profile were used for evaluation purposes by littelfuse, based upon industry standards & 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. figure 14. reflow solder profile figure 15. wave solder profile temperature ( o c) 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 260 o c second preheat first preheat 230 ml varistor series rohs figure 16. lead-free re-flow solder profile 5.0 6.0 7.0 maximum temperature 260?c 20 - 40 seconds within 5?c preheat zone ramp rate <3?c/s 60 - 150 sec > 217?c
surface mount varistors 176 www.littelfuse.com multilayer transient voltage surge suppressors ml varistor series recommended pad outline c b a note: avoid metal runs in this area. note dimension pad size 1210 size device 1206 size device 0805 size device 0603 size device in mm in mm in mm in mm a 0.160 4.06 0.160 4.06 0.120 3.05 0.100 2.54 b 0.100 2.54 0.065 1.65 0.050 1.27 0.030 0.76 c 0.040 1.02 0.040 1.02 0.040 1.02 0.035 0.89 table 1: pad layout dimensions 0402 size device in mm 0.067 1.70 0.020 0.51 0.024 0.61 rohs
surface mount varistors 177 www.littelfuse.com ordering information vxxml types mechanical dimensions standard shipping quantities ml varistor series multilayer transient voltage surge suppressors 3 surface mount varistors e l w d v 18 1206 packing options t: 13in (330mm) diameter reel h: 7in (178mm) diameter reel (0603-1210 sizes) a: bulk pack device size: i.e 120 mil x 60 mil device family littelfuse tvss device x maximum dc working voltage mla x x capacitance option no letter : standard l: low capacitance version end termination option no letter: ag/pt w: ag/pd multilayer series designator (3mm x 1.5mm) n: nickel barrier (0402 -1210 only). r: 7in (178mm) diameter reel (0402 size only) dimension chip size 1210 1206 0805 0603 in mm in mm in mm in mm d max. 0.113 2.87 0.071 1.80 0.043 1.10 0.035 0.90 e 0.02 0.01 0.50 0.25 0.02 0.01 0.50 0.25 0.02 0.01 0.50 0.25 0.015 0.008 0.4 0.2 l 0.125 0.012 3.20 0.30 0.125 0.012 3.20 0.30 0.079 0.008 2.01 0.20 0.063 0.006 1.6 0.15 w 0.10 0.012 2.54 0.30 0.06 0.011 1.60 0.28 0.049 0.008 1.25 0.20 0.032 0.06 0.8 0.15 0402 in mm 0.024 0.90 0.010 0.006 0.25 0.15 0.039 0.004 1.0 0.1 0.020 0.004 0.5 0.1 device size ?3 inch reel (? option) ? inch reel (? option) bulk pack (? option) 1210 8,000 2,000 2500 1206 10,000 2,500 2500 0805 10,000 2,500 2500 0603 10,000 2,500 2500 0402 n/a 10,000 n/a rohs
surface mount varistors 178 www.littelfuse.com multilayer transient voltage surge suppressors ml varistor series tape and reel specifications ?conforms to eia - 481-1, revision a ?can be supplied to iec publication 286 - 3 symbol description dimensions in millimeters a 0 width of cavity dependent on chip size to minimize rotation. b 0 length of cavity dependent on chip size to minimize rotation. k 0 depth of cavity dependent on chip size to minimize rotation. w width of tape 8 0.2 f distance between drive hole centers and cavity centers 3.5 0.05 e distance between drive hole centers and tape edge 1.75 0.1 p 1 distance between cavity centers 4 0.1 p 2 axial drive distance between drive hole centers & cavity centers 2 0.1 p 0 axial drive distance between drive hole centers 4 0.1 d 0 drive hole diameter 1.55 0.05 d 1 diameter of cavity piercing 1.05 0.05 t 1 0.1 max top tape thickness 0402 size 0603, 0805, 1206 & 1210 sizes 2 0.05 n/a k 0 t 1 d 0 p 0 d 1 p 1 a 0 p 2 b 0 f e w plastic carrier tape embossment top tape 8mm nominal product identifying label 178mm or 330mm dia. reel embossed paper (0402 size only) rohs

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