Varistor Front-line solutions for transient surge protection 2017 by Littelfuse

More catalogs by Littelfuse | Varistor Front-line solutions for transient surge protection 2017 | 254 pages | 2017-11-12

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Catalog Varistor Front-line solutions for transient surge protection 2017

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Varistor Front-line solutions for transient surge protection 2017 is listed under these categories

Industrial Supply > Electrical & Test

Featured catalog pages of Varistor Front-line solutions for transient surge protection 2017

metal-oxide varistors movs introduction to overvoltage suppression continued transient threats – what are transients repeatable transients are frequently caused by the operation of motors generators or the switching of reactive circuit components random transients on the other hand are often caused by lightning figure 1 and electrostatic discharge esd figure 2 lightning and esd generally occur unpredictably and may require elaborate monitoring to be accurately measured especially if induced at the circuit board level numerous electronics standards groups have analyzed transient voltage occurrences using accepted monitoring or testing methods the key characteristics of several transients are shown below in table 1 vp vp/2 t1 t t2 figure 1 lightning transient waveform voltage current lighting 25kv 20ka rise-time duration 10µs 1ms switching 600v 500a 50µs 500ms emp 1kv 10a 20ns 1ms esd 15kv 30a <1ns 100ns 100 90 current i voltage transients are defined as short duration

metal-oxide varistors movs surface mount multilayer varistors mlvs mle series device ratings and specifications max continuous working voltage -55ºc to 125ºc part number nominal voltage vnom at 1ma dc min v max v 22 28 22 28 22 28 22 28 note 1 vmdc v 18 18 18 18 v18mle0402n v18mle0402f note 8 v18mle0603n v18mle0603f note 8 performance specifications 25ºc maximum clamping maximum esd clamp voltage at specified voltage note 2 current 8/20µs vc 8kv contact 15kv air typical capacitance at 1mhz v 50 at 1a 50 at 1a 50 at 1a 50 at 1a v <125 <125 <75 <75 clamp v <110 <110 <110 <110 pf <55 <55 <125 <125 note 3 note 4 v18mle0603ln 18 22 28 50 at 1a <100 <140 <100 v18mle0805n v18mle0805ln v18mle1206n 18 18 18 22 22 22 28 28 28 50 at 1a 50 at 1a 50 at 1a <70 <75 <65 <75 <135 <65 <500 <290 <1700 notes 1 for applications of 18vdc or less higher voltages available contact your littelfuse sales representative 2 tested with iec-61000-4-2 human body model hbm discharge test circuit 3

metal-oxide varistors movs surface mount multilayer varistors mlvs auml series auml varistor series rohs description the auml series of multilayer transient surge suppressors was specifically designed to suppress the destructive transient voltages found in an automobile the most common transient condition results from large inductive energy discharges the electronic systems in the automobile e.g antilock brake systems direct ignition systems engine control airbag control systems wiper motor controls etc are susceptible to damage from these voltage transients and thus require protection the auml transient suppressors have temperature independent suppression characteristics affording protection from -55ºc to 125ºc size table metric eia 3216 1206 3225 1210 4532 1812 5650 2220 the auml suppressor is manufactured from semiconducting ceramics which offer rugged protection and excellent transient energy absorption in a small package the devices are available in ceramic leadless chip

metal-oxide varistors movs surface mount varistors sm20 series sm20 series ratings specifications maximum rating 85°c continuous transient vrms vdc part number branding vmac vmdc v v v26sm20 26sm20 20 26 v175sm20 v230sm20 v250sm20 v275sm20 v300sm20 v320sm20 175sm20 230sm20 250sm20 275sm20 300sm20 320sm20 175 230 250 275 300 320 225 300 330 369 405 420 energy peak current 10 x 1000µs 8 x 20µs wtm itm 1x pulse 1x pulse j 20 160 note 1 90 122 130 140 165 150 a specifications 25°c maximum varistor voltage clamping at 1ma dc voltage test current 8 x 20 µs vnom min vnom max v 32 10ma 247 324 354 389 420 462 2000 6500 6500 6500 6500 6500 6500 v 40 10ma 303 396 429 473 517 540 typical capacitance f 1mhz vc ipk c v a pf 63 20 12000 455 595 650 710 775 810 100 100 100 100 100 100 1400 1100 1000 900 800 750 1 energy rating for impulse duration of 30ms minimum to one half of peak current automotive load dump peak current energy and power derating curve for applications

metal-oxide varistors movs radial lead varistors ultramov® varistor series part numbering system base part codes see ratings specifications tables and notes below option codes see notes below v xx e xxx p lx x x xxxxx for “varistor” other nonstandard options x2855 nickel barrier coated wire option see notes below disc diameter 07 10 14 or 20 mm nonstandard lead spacing options blank standard lead spacing see dimensions table 5 5mm lead spacing 7 7.5mm lead spacing 1 10mm lead spacing encapsulation e epoxy p phenolic halogen free vmacrms 130 to 625 v lead-free halogen-free and rohs compliant indicator ultramov™ is a trademark of littelfuse inc packaging b bulk pack t tape and reel a ammo pack lead formation l1 straight l2 crimped l3 in-line l4 trim/crimp bulk pack only ordering notes for standard parts use the base part designator only for parts with non-standard options such as additional form packaging and lead space options use base part option code option

metal-oxide varistors movs radial lead varistors la varistor series varistor model size 7mm 10mm 14mm 20mm voltage model min max min max min max min max v130lav320la 12 0.472 16 0.630 20 0.787 26.5 1.043 v385lav1000la 13 0.0512 17 0.689 20.5 0.807 28 1.102 ød all 9 0.354 12.5 0.492 17 0.669 23 0.906 e all 6.5 0.256 8.5 0.335 6.5 0.256 8.5 0.335 6.5 0.256 note 2 8.5 0.335 note 2 3.5 0.138 1.5 0.059 3.5 0.138 symbol product dimensions mm a seating plane atrim ltrim 4 0.157 6 0.236 crimped and trimmed lead e v130la 1.5 3.5 1.5 3.5 1.5 v1000la 0.098 0.217 0.098 0.217 0.098 5.5 0.217 2.5 0.098 5.5 0.217 5.6 0.220 5.6 0.220 5.6 0.220 1 crimped leads arev320la standard on0.059 la types supplied in tape0.138 and reel 0.059 0.138 0.059 and are denoted by the model letter t model letter s denotes 2.5 special 5.5 under-crimped 2.5 5.5 straight leads andv385laletter u denotes leads 2.5 seating per iec-7175.6 e plane interpretation v130la dimension a vrms voltage model

metal-oxide varistors movs radial leaded varistors aumov® varistor series repetitive surge capability for 10mm parts v10x50auto v10x95auto 5mm v05e14 e42auto v10x130auto v10x625auto surge current a 10 x1x 103x2x 10415x x 2 x 100 10510 x 3x 10 100 4 6 x 5x 1010 10 10 x 106x 10 1 10000 100 10 1x 2x 15x 102x 103x 104x 105x 106x 1 10 1 0.1 1 10 10 10 100 1000 impulse duration µs 100 1000 100 1000 10000 impulse duration µs 10000 10000 impulse duration µs repetitive surge capability for 14mm parts repetitive surge capability for 14mm parts 10mm v10e14 e42auto v14x50auto v14x95auto v14x14auto – v14x42auto 14mm v14e14 e42auto 10000 10000 2 x 1000 102x 1000 3 surge current a 100 15x 1x 1x 2x 15x 102x 103x 104x 105x 106x surge current a surge current a 1000 100 1x 2x 10000 10 100 100 surge current a uto 15xx 10 1024xx 10 1035x 10 x 104x ∞ 105x 106x 10 10 1 1 10000 10 100 1000 1 10000 10000 102 1000 surge current a surge current a 10000 10000 v020x14auto –

metal-oxide varistors movs industrial high energy terminal varistors ha series ha varistor series rohs description ha series transient surge suppressors are industrial high energy metal-oxide varistors movs they are designed to provide secondary surge protection in the outdoor and service entrance environment distribution panels of buildings and also in industrial applications for motor controls and power supplies used in the oil-drilling mining and transportation fields the design of the ha series of movs provide rigid terminals for screw mounting also available in a clipped lead version for through hole board placement or to accommodate soldered leads designation hc agency approvals agency agency approval agency file number ul1449 e320116 22.2-1 91788 see ratings and specifications table for part number and brand information features • high peak pulse current capability itm 25,000a to 40,000a • lead–free halogen-free and rohs compliant • wide operating

metal-oxide varistors movs axial lead application specific varistors ma series power dissipation ratings peak pulse current test waveform percent of peak value percent of rated value 100 90 80 70 60 50 40 30 20 100 o1 virtu t time t1 virtu t2 virtu 90 50 example f 8 s t1 20 s t2 10 o1 10 t t1 0 -55 50 60 figure 1 70 80 90 100 110 120 130 140 150 ambient temperature oc figure 1 current and power should transients occur inenergy rapid succession the derating average power curve 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 specifications shown on the device ratings and specifications table for the specific 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

metal-oxide varistors movs radial lead varistors tmov®25s varistor series thermal characteristics peak current energy derating curve typical time to open circuit under ul 1449 abnormal overvoltage limited current test 100 percent of rated value 10 current a typical 10 a 5a 1 2.5 a 80 60 40 20 0.5 a 0 -55 50 10 figure 1 100 1000 10000 70 80 90 100 110 120 130 ambient temperature ºc figure 2 0.1 60 for applications exceeding 85ºc ambient temperature the peak surge current and energy ratings must be reduced as shown time secs transient v–i characteristic curves 10000 750       maximum peak voltage v          625 420 385 440 550 510 460 1000 275 115 130 140 150 175 230 300 320 250 100 10µa figure 3 100µa 1ma 10ma 100ma 1a 10a 100a 1000a 10000a 100000a       peak current         © 2017 littelfuse inc specifications are subject to change without notice revised

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