183 varistor products revision: january 9, 2009 ?2008 littelfuse, inc. ma varistor series axial lead / application speci?c varistors > ma series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/ma.html for current information. ma series description the ma series of transient surge suppressors are axial lead metal oxide varistors (movs) for use in a wide variety of board level industrial and commercial electronic equipment. they are intended to protect components and signal/data lines from low energy transients where the small axial lead package is required. the ma series is offered with standard ('s' suf?x) or tightened ('b' suf?x) clamping voltage. see ma series device ratings and speci?cations table for part number and brand information. features t n n e j b n f u f s disc size t 4 n b m m b y j b m m f b e package t 8 j e f p q f s b u j o h w p m u b h f range: v m(ac)rms 9v to 264v v m(dc) 13v to 365v t " w b j m b c m f j o u b q f b o e reel or bulk packaging t / p e f s b u j o h v q u p 85oc ambient t / f x c m b d l f q p y z p g g f s t improved performance for high temperature lead-free wave soldering process. absolute maximum ratings caution: stresses above those listed in absolute maximum ratings may cause permanent damage to the device. this is a stress only rati ng and operation of the device at these or any other conditions above those indicated in the operational sections of this speci?cation is not im plied. continuous ma series units steady state applied voltage: ac voltage range (v m(ac)rms ) 9 to 264 v dc voltage range (v m(dc) ) 13 to 365 v transient: peak pulse current (i tm ) for 8/20 s current wave(see figure 2) 40 to 100 a single-pulse energy range for 2ms current square wave (w tm ) 0.06 to 1.7 j operating ambient temperature range (t a ) -55 to +85 c storage temperature range (t stg ) -55 to +125 c temperature coefficient ( v) of clamping voltage (v c ) at specified test current <0.01 %/c hi-pot encapsulation (coating isolation voltage capability) dielectric must withstand indicated dc voltage for one minute per mil-std 202, method 301) 1000 v coating insulation resistance 1000 m 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 ma varistor series rohs agency approvals agency agency file number none
184 varistor products ?2008 littelfuse, inc. revision: january 9, 2009 ma varistor series axial lead / application speci?c varistors > ma series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/ma.html for current information. ma series ratings & speci?cations part number brand (mm) maximum rating (85c) speci?cations (25c) continuous transient varistor voltage at 1ma dc test current max clamping volt v c at 2.0a (8/20 s) typical capacitance 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 f = 1mhz (v) (v) (j) (a) (v) (v) (v) (a) (pf) v18ma1a v18ma1a v18ma1a 18a 18b 18c 9 10 10 13 14 14 0.06 0.07 0.06 40 40 40 14 15 15 18 18 18 23 21 21 49 44 49 550 550 550 v22ma1a v22ma1b v22ma1s 22a 22b 22s 10 14 14 15 18 18 0.09 0.10 0.09 40 40 40 16 19 19 22 22 22 28 26 26 55 51 55 410 410 410 v27ma1a v27ma1b v27ma1s 27a 27b 27s 13 17 17 19 22 22 0.10 0.11 0.10 40 40 40 21 24 24 27 27 27 34 31 31 67 59 67 370 370 370 v33ma1a v33ma1b v33ma1s 33a 33b 33s 18 20 20 23 26 26 0.13 0.15 0.14 40 40 40 26 29.5 29.5 33 33 33 40 36.5 36.5 73 67 73 300 300 300 v39ma2a v39ma2b v39ma2s 39a 39b 39s 22 25 25 28 31 31 0.16 0.18 0.17 40 40 40 31 35 35 39 39 39 47 43 43 86 79 86 250 250 250 v47ma2a v47ma2b v47ma2s 47a 47b 47s 27 30 30 34 38 38 0.19 0.21 0.19 40 40 40 37 42 42 47 47 47 57 52 52 99 90 99 210 210 210 v56ma2a v56ma2b v56ma2s 56a 56b 56s 32 35 35 40 45 45 0.23 0.25 0.23 40 40 40 44 50 50 56 56 56 68 62 62 117 108 117 180 180 180 v68ma3a v68ma3b v68ma3s 68a 68b 68s 38 40 40 48 56 56 0.26 0.30 0.27 40 40 40 54 61 61 68 68 68 82 75 75 138 127 138 150 150 150 v82ma3a v82ma3b v82ma3s 82a 82b 82s 45 50 50 60 66 66 0.33 0.37 0.34 40 40 40 65 73 73 82 82 82 99 91 91 163 150 163 120 120 120 v100ma4a v100ma4b v100ma4s 100 101 102 57 60 60 72 81 81 0.40 0.45 0.42 40 40 40 80 90 90 100 100 100 120 110 110 200 185 200 100 100 100 v120ma1a v120ma2b v120ma2s 120 121 122 72 75 75 97 101 101 0.40 0.50 0.46 100 100 100 102 108 108 120 120 120 138 132 132 220 205 220 40 40 40 v150ma1a v150ma2b 150 151 88 92 121 127 0.50 0.60 100 100 127 135 150 150 173 165 255 240 32 32 v180ma1a v180ma3b 180 181 105 110 144 152 0.60 0.70 100 100 153 162 180 180 207 198 310 290 27 27 v220ma2a v220ma4b 220 221 132 138 181 191 0.80 0.90 100 100 187 198 220 220 253 242 380 360 21 21 v270ma2a v270ma4b 270 271 163 171 224 235 0.90 1. 0 0 100 100 229 243 270 270 311 297 460 440 17 17 v330ma2a v330ma5b 330 331 188 200 257 274 1. 0 0 1. 10 100 100 280 297 330 330 380 363 570 540 14 14 v390ma3a v390ma6b 390 391 234 242 322 334 1.20 1.30 100 100 331 351 390 390 449 429 670 640 12 12 v430ma3a v430ma7b 430 431 253 264 349 365 1.50 1.70 100 100 365 387 430 430 495 473 74 0 700 11 11 note: average power dissipation of transients not to exceed 200mw.
185 varistor products revision: january 9, 2009 ?2008 littelfuse, inc. ma varistor series axial lead / application speci?c varistors > ma series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/ma.html for current information. ma series should transients occur in rapid succession, 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 temperatures as shown above. 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. power dissipation ratings 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 100 90 50 10 o 1 t t 1 t 2 time percent of peak value peak pulse current test waveform 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 repetitive surge capability 100 50 20 10 5 2 1 0.5 0.2 0.1 surge current (a) 20 100 1,000 10,000 impulse duration (s) 2 10 10 2 10 3 1 10 4 10 5 10 6 indefinite disc size 3mm v120ma1a - v430ma7b v120ma1a/s - v430ma3a 50 20 10 5 2 1 0.5 0.2 0.1 2 10 10 2 10 3 disc size 3mm v18ma1a - v100ma4b 1 10 4 10 5 indefinite 10 6 20 100 1,000 10,000 impulse duration (s) surge current (a) v18ma - v100ma 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. figure 1 figure 2 figure 3 figure 4
186 varistor products ?2008 littelfuse, inc. revision: january 9, 2009 ma varistor series axial lead / application speci?c varistors > ma series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/ma.html for current information. 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 peak amperes (a) v430ma7b v390ma6b v330ma5b v270ma4b v220ma4b v180ma3b v150ma2b v120ma2b maximum clamping voltage disc size 3mm 120 to 430v n(dc) rating t a = -55 o c to 85 o c maximum peak volts (v) v120ma2b - v430ma7b 600 500 400 300 200 100 90 80 70 60 50 40 30 20 maximum peak volts (v) 10 -3 peak amperes (a) 10 -2 10 -1 10 0 10 1 10 2 10 3 v33ma1b v27ma1b v22ma1b v100ma4b v82ma3b v68ma3b v18ma1b max clamping voltage disc size 3mm 18 to 100v n(dc) rating t a = -55 o c to 85 o c v47ma2b v56ma2b v39ma2b v18ma1b - v100ma4b maximum clamping voltage 10 -2 10 -1 10 0 10 1 10 2 maximum peak volts (v) peak amperes (a) max clamping voltage disc size 3mm 120 to 430v n(dc) rating t a = -55 o c to 85 o c 4,000 2,000 1,500 1,000 800 600 400 200 100 v430ma3a v390ma3a v330ma2a v270ma2a v220ma2a v180ma1a v150ma1a v120ma1a/s v120ma1a/s - v430ma3a 800 600 400 300 200 150 100 80 60 40 30 20 10 -2 10 -1 10 0 10 1 10 2 maximum peak volts (v) v100ma4a/s v82ma3a/s v68ma3a/s v56ma2a/s v39ma2a/s v33ma1a/s v27ma1a/s v22ma1a/s v18ma1a/s peak amperes (a) max clamping voltage disc size 3mm 18 to 100v n(dc) rating t a = -55 o c to 85 o c v47ma2a/s v18ma1a/s - v100ma4a/s figure 5 figure 6 figure 7 figure 8
187 varistor products revision: january 9, 2009 ?2008 littelfuse, inc. ma varistor series axial lead / application speci?c varistors > ma series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/ma.html for current information. ma series product dimensions ll h b (diameter) d symbol inches millimeters min max min max ?b 0.024 0.026 0.61 0.66 ?d 0.118 0.177 3.0 4.5 h 0.177 0.276 4.5 7.0 l 1.740 1.220 27.3 31.0 typical weight = 0.5g operating/storage temperature -40c to +85c passive aging +85c, 1000 hours +/-10% typical voltage change humidity aging +85c, 85% rh, 1000 hours +/-10% typical voltage change thermal shock +85c to -40c 5 times +/-10% typical voltage change solvent resistance milCstdC202, method 215f moisture sensitivity level 1, jCstdC020c lead material tinCplated copper clad steel soldering characteristics solderability per milCstdC202, method 208e insulating material cured, ?ame retardant epoxy polymer meets ul94vC0 requirements device labeling marked with lf, voltage and date code physical speci?cations environmental speci?cations tape and reel dimensions h1 = h2 +/- 0.040 h1 h2 0.240+/- 0.040 2.062+/- 0.0 5 9 2.681 max 0.063 max conforms to eia standard rs-296-e 0.080 max 0.200 +/- 0.02 part numbering system varistor voltage (v n at 1ma) energy/clamping voltage variant series designator ma: bulk pack mt: tape and reel v xxx ma xx varistor wave solder pro?le 0 50 100 150 200 250 300 00.511.522.533.54 time(minutes) temperature (oc) maximum wave 240c leadCfree pro?le 0 50 100 150 200 250 300 00.511.522.533.54 time(minutes) temperature (oc) maximum wave 260c non leadCfree pro?le figure 9 figure 10
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