? 2014 littelfuse, inc. specifcations are subject to change without notice. revised: 05/23/14 rohs description features ? maximum single surge capability 20 ka, 8/20 waveshape. ? nominal discharge current value: 10ka. ? intermediate current rating: 50a/150a. ? -45c to +75c operating temperature. ? recognized to ul 1449 3rd edition. ? lead-free and rohs compliant. ? integrated micro-switch for indication circuitry/design. agency approvals applications ? spd applications ? ac/dc distribution ? it/data center ? power supplier ? telecommunication agency agency file number e320116 smov25s varistor series the littelfuse smov thermally protected varistor is a self- protected device. it consists of a 25mm 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 confguration 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 simplifes the customers circuit design. absolute maximum ratings ? for ratings of individual members of a series, see device ratings and specifcations chart. smov25s 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: non-repetitive surge current, 8/20s waveform (i tm ) 20,000 a non-repetitive energy capability, 2ms waveform (w tm ) 170 to 670 j operating ambient temperature range (t a ) -45 to +75 c storage temperature range (t stg ) -45 to +85 c hi-pot encapsulation (isolation voltage capability) 2500 v isolation voltage capability (when the thermal disconnect opens) 1500 v housing insulation resistance >1,000 m? 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 specifcation is not implied. varistor products thermally protected varistors > smov25s series
? 2014 littelfuse, inc. specifcations are subject to change without notice. revised: 05/23/14 part number maximum rating (75c) specifcations (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 (in) v m (ac) v m(dc) w tm i tm 1 pulse in v n(dc) min v n(dc) max vc i pk c (v) (v) (j) (a) (a) (v) (v) (a) (pf) smov25s111mp 115 150 170 20000 10000 162 198 295 100 3200 SMOV25S111NP smov25s131mp 130 170 190 20000 10000 184.5 225.5 335 100 2800 smov25s131np smov25s151mp 150 200 220 20000 10000 216 264 390 100 2300 smov25s151np smov25s181mp 175 225 250 20000 10000 243 297 450 100 1900 smov25s181np smov25s251mp 250 320 330 20000 10000 351 429 640 100 1400 smov25s251np smov25s271mp 275 350 350 20000 10000 387 473 700 100 1250 smov25s271np smov25s301mp 300 385 370 20000 10000 423 517 765 100 115 0 smov25s301np smov25s321mp 320 420 390 20000 10000 459 561 825 100 1080 smov25s321np smov25s421mp 420 560 460 20000 10000 612 74 8 110 0 100 820 smov25s421np smov25s461mp 460 615 490 20000 10000 675 825 1220 100 750 smov25s461np smov25s511mp 510 670 520 20000 10000 738 902 1335 100 680 smov25s511np smov25s551mp 550 74 5 550 20000 10000 819 1001 1475 100 630 smov25s551np smov25s621mp 620 800 600 20000 10000 900 110 0 1625 100 550 smov25s621np smov25s751mp 750 970 670 20000 10000 1080 1320 1950 100 460 smov25s751np device ratings & specifcations average power dissipation of transients should not exceed 1.5 watts same ratings and specifcations apply to non isolated monitored switch alternative design. replace "m" with "n" in the part number. e.g.: SMOV25S111NP. refer to part number system at the end of this document. varistor products thermally protected varistors > smov25s series
? 2014 littelfuse, inc. specifcations are subject to change without notice. revised: 05/23/14 typical time to open circuit under ul 1449 abnormal overvoltage limited current test: thermal characteristics 0. 1 1 10 11 01 00 current (a) 10 a 5 a 2.5 a 0.5 a time (secs) ty pical 0 20 40 60 80 10 0 -4 55 06 07 0 80 90 10 01 10 12 01 30 ambien t tempera ture (oc) percen t of ra ted v alue peak current & energy derating curve 100 1000 10000 10 a 10 0a1 ma 10 ma 10 0ma1 a1 0a 10 0a 10 00 a 10 000a 1 00000 a p eak curr ent maximum p eak vo ltage (v) 750 625 550 51 0 460 440 385 420 11 5 13 0 14 0 15 0 17 5 230 250 275 30 0 320 transient vCi characteristic curves for applications exceeding 75oc ambient temperature, the peak surge current and energy ratings must be reduced as shown below. figure 1 figure 2 figure 3 varistor products thermally protected varistors > smov25s series
? 2014 littelfuse, inc. specifcations are subject to change without notice. revised: 05/23/14 operating/storage temp. -45c to +75c / -45c to +85c passive aging +75c, 1000 hours -/+10% typical voltage change humidity aging +75c, 85%r.h., 1000 hours -/+10% typical voltage change thermal shock +75c to -40c 5 times -/+10% typical voltage change solvent resistance mil-std-202, method 215f moisture sensitivity level 1, j-std-020c lead material tinCplated soldering characteristics solderability per mil-std-202, method 208e insulating material cured, fame retardant epoxy polymer meets ul94v-0 requirements device labeling marked with lf, voltage, ul logos, and date code physical specifcations environmental specifcations smov25s pulse rating curve 1 2 15 10 2 10 3 1 10 10 0 1 000 1 0000 1 00000 10 1 00 1 000 1 0000 impulse dur ation (secs) 10 4 10 5 10 6 figure 4 wave solder profle because the smov25s series varistors contain a thermal protec- tion device, care must be taken when soldering the devices into place. two soldering methods are possible. firstly, hand soldering: 0 50 100 150 200 250 300 00 .5 11 .5 22 .5 33 .5 4 tim e (mi nute s) te mper at ure (o c) ma xi mu m wa ve 24 0c leadCfree profle 0 50 100 150 200 250 300 00 .5 11 .5 22 .5 33 .5 4 time (mi nute s) t emperat ure (o c) ma xi mu m wa ve 26 0c non leadCfree profle 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 varistor products thermally protected varistors > smov25s series
? 2014 littelfuse, inc. specifcations are subject to change without notice. revised: 05/23/14 product dimensions 31max 36max 1 6.5max 20.3 3.50. 2 3*0.60.2 0.30.2 1 .30.3 9min 1 0min 1 .40.2 0.50.2 8.50.5 2.50.3 4.01. 2 1 3.40.2 lf 9 smov 25s321m p 11 48 3.50.2 application example thermal disconnect mov s1 on s3 common s2 off 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 ). thermal disconnect mov s1 on (normal close ) s3 common s2 off (normal open ) p1 p2 primary side secondary side galvanic isolation lf 9 smovxxs321mp 1209 s 2 s 3 s 1 p2 p1 p2 p1 s 2 s 3 s 1 thermal disconnect mov s1 on s3 common s2 off 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 ). thermal disconnect mov s1 on (normal close ) s3 common s2 off (normal open ) p1 p2 primary side secondary side galvanic isolation lf 9 smovxxs321mp 1209 s 2 s 3 s 1 p2 p1 p2 p1 s 2 s 3 s 1 lead confguration 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 specifcation varistor products thermally protected varistors > smov25s series
? 2014 littelfuse, inc. specifcations are subject to change without notice. revised: 05/23/14 rated ac voltage (v m(ac)rms ) C mcov this is the maximum continuous sinusoidal rms voltage that may 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 for 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 confdence factor. nominal discharge current (i n ) peak value of the current, selected by the manufacturer, through the spd having 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 1449 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. ul 1449 an underwriters laboratory standard covering the safety requirements for 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 device 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 for a single current pulse at a specifed 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 off (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 specifed minimum and maximum voltage range. term defnitions part numbering system smov 25 s 321 n p device fa mily lit telfuse t hermally self p rotected mo v disc size (mm) 25mm ceramic shape s: square 11 5v to 750v v m(a c)rm s m:with isolat ed monit or ed s witc h n: non isolat ed monit or ed s witc h design p: lead-f r ee and rohs compliant xxxxx option codes lf9 smo v25s321mp 1 148 ul r ecogniz ed component mark p roduction site code lit telfuse mark p art number p roduction date dode (y ear and w eek) part marking system varistor products thermally protected varistors > smov25s series
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