varistor products ?2012 littelfuse, inc. revision: may 24, 2012 speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/SMOV34S.html for current information. varistor products SMOV34S varistor series thermally protected varistors > SMOV34S series hiCenergy movs SMOV34S series description the littelfuse smov thermally protected varistor is a self- protected device. it consists of a 34mm square varistor with an integral thermal disconnect designed to open in the event of overheating due to abnormal overvoltage as outlined in ul1449 3rd edition. the smov helps facilitate spd module compliance to ul1449 and offers quick thermal response due to the close proximity of the integrated thermal element to the mov body. this con?guration also offers lower inductance than most discreet solutions resulting in improved clamping performance to fast over voltage transients. the device has a separate micro-switch, which can be used to indicate that the mov has been disconnected from the circuit. this separate switch makes the monitoring circuitry completely isolated from the main power which ensures indicator circuit safety and simpli?es the customers circuit design. features t . b y j n v n t j o h m f surge capability 40 ka, 8/20 waveshape. t / p n j o b m % j t d i b s h f current value: 20ka. t * o u f s n f e j b u f d v s s f o u rating: 50a/150a. t ? $ u p ? $ p q f s b u j o h temperature. t 3 f d p h o j [ f e u p 6 - 1449 3rd edition. t - f b e ' s f f b o e rohs compliant. t * o u f h s b u f e n j d s p t x j u d i for indication circuitry/design. applications rohs t 4 1 % b q q m j d b u j p o t t " $ % $ e j t u s j c v u j p o t * 5 % b u b d f o u f s t 1 p x f s t v q q m j f s t 5 f m f d p n n v o j d b u j p o SMOV34S varistor series agency approvals agency agency file number e320116
varistor products ?2012 littelfuse, inc. revision: may 24, 2012 speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/SMOV34S.html for current information. varistor products SMOV34S varistor series thermally protected varistors > SMOV34S series 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 $ " 6 5 * 0 / 4 u s f t t f t b c p w f u i p t f m j t u f e j o i " c t p m v u f . b y j n v n 3 b u j o h t w n b z d b v t f q f s n b o f o u e b n b h f u p u i f e f w j d f 5 i j t j t b t u s f t t p o m z s b u j o h b o e p q f s b u j p o of the device at these or any other conditions above those indicated in the operational sections of this speci?cation is not implied. SMOV34S series units continous: steady state applied voltage: dc voltage range (vm(dc)) 150 to 970 v ac voltage range (v m(ac)rms ) 115 to 750 v transient: / p o 3 f q f u j u j w f 4 v s h f $ v s s f o u
? t 8 b w f g p s n * tm ) 40,000 a / p o 3 f q f u j u j w f & o f s h z $ b q b c j m j u z
n t 8 b w f g p s n 8 tm ) 280 to 1200 j operating ambient temperature range (t a ) u p ? $ storage temperature range (t stg ) u p ? $ hi-pot encapsulation (isolation voltage capability) 2500 v isolation voltage capability (when the thermal disconnect opens) 1500 v housing insulation resistance >1,000 m part number maximum rating (75c) speci?cations (25 c) continuous transient varistor voltage at 1ma test current maximum clamping voltage 8/20s typical capacitance f = 1mhz ac volts dc volts energy 2ms peak surge current 8/20s nominal discharge current v m (ac) rms v m(dc) w tm i tm 1 pulse in v /(dc) min v /(dc) max vc i pk c (v) (v) (j) (a) (a) (v) (v) (a) (pf) SMOV34S111mp 115 150 280 4 0000 20000 163 202 305 200 11500 SMOV34S131mp 130 175 310 4 0000 20000 184 228 345 200 10000 SMOV34S151mp 150 200 360 4 0000 20000 212 268 405 200 8000 SMOV34S181mp 180 240 400 4 0000 20000 254 312 488 200 6800 SMOV34S251mp 250 320 490 4 0000 20000 354 429 650 200 5000 SMOV34S271mp 275 350 550 4 0000 20000 389 473 730 200 4500 SMOV34S301mp 300 385 590 4 0000 20000 433 528 780 200 4050 SMOV34S321mp 320 420 640 4 0000 20000 462 561 830 200 3800 SMOV34S421mp 420 560 910 4 0000 20000 610 748 1130 200 3000 SMOV34S461mp 460 610 960 4 0000 10000 642 783 1188 200 2800 SMOV34S511mp 510 675 960 4 0000 10000 735 910 1350 200 2500 SMOV34S551mp 550 700 965 4 0000 10000 770 939 1415 200 2250 SMOV34S751mp 750 970 1200 4 0000 10000 1080 1320 2000 200 1800 SMOV34S series ratings & speci?cations average power dissipation of transients should not exceed 2.0 watts 4 b n f s b u j o h t b o e t q f d j m d b u j p o t b q q m z u p / p o * t p m b u f e . p o j u p s f e 4 x j u d i b m u f s o b u j w f e f t j h o 3 f q m b d f . x j u i / j o u i f q b s u o v n c f s f h 4 . 0 7 4 / 1 3 f g f s u p 1 b s u / v n c f s 4 z t u f n b u u i f f o e p g u i j t e p d v n f o u
varistor products ?2012 littelfuse, inc. revision: may 24, 2012 speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/SMOV34S.html for current information. varistor products SMOV34S varistor series thermally protected varistors > SMOV34S series hiCenergy movs SMOV34S series pulse rating curve smov34 50,000 20,000 10,000 5,000 2,000 1,000 500 200 100 50 20 10 20 100 1,000 10,000 surge current (a) impulse dura tion ( s) 15 1 ind e finite 10 5 10 2 2 10 3 10 4 10 6 peak current & energy derating curve 0.1 1 10 11 01 0 0 current (a) 10 a 5 a 2.5 a 0.5 a time (secs) typical SMOV34S vCi characteristic curves for SMOV34S varistor 1000 10000 1ma 10ma 100ma 1a 10a 100a? 10000a 100000a ta = -45 c to 75c v751 v681 v661 v571 v551 v511 v391 v3 5 1 v331 v321 v271 v25 1 v201 v181 v1 51 v141 v 111 v131 v301 v481 v441 v421 100 1000a maximum clamping voltage SMOV34S series current - amps voltage - volts ' p s b q q m j d b u j p o t f y d f f e j o h ? $ b n c j f o u u f n q f s b u v s f
u i f q f b l surge current and energy ratings must be reduced as shown. figure 1 figure 2 figure 3 figure 4 thermal characteristics 0 20 40 60 80 100 -4 55 06070 80 90 100 110 120 130 ambient temperature (oc) percent of rated value
varistor products ?2012 littelfuse, inc. revision: may 24, 2012 speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/SMOV34S.html for current information. varistor products SMOV34S varistor series thermally protected varistors > SMOV34S series lead material tinCplated copper soldering characteristics solderability per milCstdC202, method 208e insulating material cured, ?ame retardant epoxy polymer meets ul94vC0 requirements. device labeling . b s l f e x j u i - '
q b s u j e f o u j m f s
b o e date code physical speci?cations operating/storage temperature ? $ u p ? $ ? $ u p ? $ humidity aging ? $
3 )
i p v s t w p m u b h f thermal shock ? $ u p ? $ u j n f t w p m u b h f solvent resistance . * - o 4 5 % o
. f u i p e ' moisture sensitivity level 1, jCstdC020c environmental speci?cations wave solder pro?le because the SMOV34S series varistors contain a thermal protec- tion device, care must be taken when soldering the devices into q m b d f 5 x p t p m e f s j o h n f u i p e t b s f q p t t j c m f ' j s t u m z
i b o e t p m e f s j o h 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 it is recommended to heatCsink the leads of the device. secondly, waveCsoldering: it is critically important that all preheat stage and the solder bath temperatures are rigidly controlled. figure 5 figure 6 part numbering system smov 3 4 s 321 n p device family littelfuse t hermally self protected mov disc size (mm) 34mm ceramic shape s: square 11 5v to 750v v m(ac)rms m:with isolated monitored switch n: non isolated monitored switch design p: lead-free and rohs compliant lf9 smov3 4s321mp 11 48 ul recognized component mark production site code littelfuse mark part number production date dode (year and week) part marking system
varistor products ?2012 littelfuse, inc. revision: may 24, 2012 speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/SMOV34S.html for current information. varistor products SMOV34S varistor series thermally protected varistors > SMOV34S series hiCenergy movs SMOV34S series 41max 44.5max 20max 6.00.2 3.60.3 6.00.2 3*0.60.2 0.30.2 1.20.3 10min 10min 1.40.2 0.50.2 11.00. 5 2.50.3 6.52.2 21. 50.2 lf 9 SMOV34S321mp 114 8 thermal disconnect mov s1 on (normal close) s3 common s2 o ff (normal open) p1 p2 primary side secondary side galvanic isolation lf9 smovxxs321mp 1209 s2 s3 s1 p2 p1 p2 p1 s2 s3 s1 lead con?guration device dimension application example thermal disconnect mov s1 on s3 common s2 o ff p1 p2 primary side secondary side galvanic isolation to protected circuit note: example only - connection to s2-s3 and s1-s3 depends on customer indication circuit and can vary. r led * led is off when the product is normal(s1,s3 connected), led is on when the product disconect opens(switch change status; s2,s3 connected as shown by dotted line ). smov switch voltage dc current (amps) contact resistance max. insulation resistance min. dialectric strength 0.5ma/minute switch 12v 0.1a 70m 100m 500vac switch speci?cation
varistor products ?2012 littelfuse, inc. revision: may 24, 2012 speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/SMOV34S.html for current information. varistor products SMOV34S varistor series thermally protected varistors > SMOV34S series ul 1449 an underwriters laboratory standard covering the safety requirements f or surge protective devices intended for permanently connected, cord-connected and direct plug-in applications. limited current abnormal over-voltage test an ac over-voltage condition applied to a surge protective de vice according to ul 1449, section 39.4. the short circuit current is limited by series connected resistors to 10a, 5a, 2.5a, 0.5a and 0.125a. the condition is maintained for 7 hours or until the device under test is disconnected from the ac supply or the current or temperature reaches equilibrium. maximum non-repetitive surge energy (w tm ) this is the maximum rated transient energy which may be dissipated f or a single current pulse at a speci?ed impulse duration, with the rated rms voltage applied, without causing device failure. nominal voltage (v n(dc) ) this is the voltage at which the device changes from the of f (standby state) to the on (clamping state) and enters its conduction mode of operation. the voltage value is usually characterised at the 1ma point and has a speci?ed minimum and maximum voltage range. term de?nitions rated ac voltage (v m(ac)rms ) C mcov this is the maximum continuous sinusoidal rms voltage that ma y be applied. this voltage may be applied at any temperature up to the maximum operating temperature of the device. maximum non-repetitive surge current (i tm ) this is the maximum peak current which may be applied f or a single 8/20s impulse, with rated line voltage also applied, without causing device failure. the pulse can be applied to the device in either polarity with the same con?dence factor. nominal discharge current (i n ) peak value of the current, selected by the manufacturer, through the spd ha ving a current waveshape of 8/20s where the spd remains functional after 15 surges. voltage protection rating (v pr ) a rating selected from a list of preferred values as given in ul 1 449 and assigned to each mode of protection. the value of vpr is determined as the nearest highest value taken from ul 1449 to the measured limiting voltage determined during the transient-voltage surge suppression test using the combination wave generator at a setting of 6kv, 3ka.
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