TRANSIENT VOLTAGE SUPPRESSORS W223 Vesog FEATURES DESCRIPTION Up to 500W for ImS Pulse Power Unitrodes TVS series of transient Capability voltage suppressors feature oxide Clamping Time in Picoseconds passivated zener type chips with full- Direct Applicability for all popular faced metallurgical bonds on both sides to Microprocessors and IC families achieve high surge capability and negli- Metallurgically bonded assembly system gible electrical degradation under repeated to assure long term reliability surge conditions. The series is especially Miniature glass encased hermetically useful in protecting microprocessor, MOS, sealed package CMOS, TTL, Schottky TTL, ECL, lL and linear integrated circuits from spurious transient disturbances. ABSOLUTE MAXIMUM RATINGS @ 25C TVS308-TVS430 TVS505-TVS528 Stand-off Voltage, Vag ......ccccccccceeccccsccsesscueecccueceuseccuneecsanteesaneseaereaes 5 to 300V occ cecceenesneee see eees 5.0V to 28.0V Peak Pulse Power (1MS)*........0.ccccccccscccsccvecueescecceseccessssseneesesiauueregeeaners L5OW occ ceecceececentesneeeeeeeaeteneee 500W Forward Surge Current (8.3mS half sinewave) ............ cc cccereenertennrenerenee LEA ec tee teetereteensereetenerenes 50A Peak Pulse Current .............cccceceeceeeeeseeeees we S@@ Table ec cccececeeecceeeseseneveseeesee See Table Breakdown Voltage .... eee SCO Tale oc ceeeecteeeeeneesvens See Table Power, Continuous ............cccccecceeseseecusccuescsceuceuseseeseecteescueeaeseneaestuteasegs BW iecccccecesccreesceeuseuseeueusestacunennes 5W Storage and Operating Temperature .................cccccccceseeeseeseeseneeees 650 F175 eee eeeeee une es ~65 to +175C See Figures 3 and 4 for Peak Pulse Power vs Pulse Duration. MECHANICAL SPECIFICATIONS TVS305 Series BODYA 928" +.001 iss: typ y 7mm =.03 Sand ndicates 3.9mm | cathode end, + 058" TYP. 085" MAX. iam C3 I ) oO ign | 08s" TYP 2.2mm .700 MIN 250" MAX D7.emm 6 asmm 1.625" MIN 41.3mm MECHANICAL SPECIFICATIONS TVS505 Series BODY B .040" + .001 Band indicates ays typ__] 1b 02mm +.03 cathode end ~\ .145" MAX. 105 TYP, 27mm 975" MIN. 300" MAX. 24.8mm 7.62mm 2.30" MIN. 8.4mm uy 2/80 498 ae UNITRODETVS 305-TVS 430 ELECTRICAL SPECIFICATIONS @ 25C TVS 505-TVS 528 Max. | Stand Min, Max. Max. Max, Max. Clamping -Off Breakdown Leakage Peak Clamping Clamping Voltage* TVS Voltage Voltage Current Pulse Current* Voltage* Voltage* Ve @ Part No. Vp BV nin) @ IMA I, @ Vp lo Vo @ lpn Ve @ 1A 5A 10A Vv V nA A Vv v v TVS305 5.0 6.0 50 7 87 - _ TVS310 10.0 1 2 8.9 16.8 _ - TVS312 12 13.8 1 7A 21.0 _ _ TVS315 15 16.7 1 5.9 25 _ _ - TVS318 18 20.4 1 49 31 ~ TVS324 24 28.4 1 3.6 42 _ _ TVS328 28 30.7 1 3.2 46 - _ TVS348 48 54 1 17 82 _ TVS360 60 67 1 14 105 _ - _ TVS410 100 111 1 91 160 _ _ _ TVS420 200 234 1 42 360 - _ = TVS430 300 342 1 28 520 _ _ TVS505 5.0 6.0 300 53.7 93 74 - 79 TVS510 10.0 11.1 5 30.3 16.5 13.2 - 44 TVS512 12.0 13.8 5 23.8 21.0 16.5 _ 18.5 TVS515 15.0 16.7 5 19.8 25.2 19.7 - 22.2 TVS518 18.0 20.4 5 16.3 30.5 23.8 26.0 - TVS524 24.0 28.4 5 11.9 42.0 32.4 37.0 - TVS528 28.0 30.7 5 10.7 46.5 35.9 41.0 _ *For 1mS pulse: see Figure 1. Pulse Waveform PULSE WHERE |, DECAYS TIME DURATION (t,) = POINT TO 50% OF |,p 3 ly PULSE CURRENT (% of lecaxi a o a 1 2 t TIME (ms) UNITRODE CORPORATION + 5 FORBES ROAD LEXINGTON, MA 02173 + TEL. (617) 861-6540 TWX (710) 326-6509 TELEX 95-1064 499 P, PEAK PULSE POWER (% of 25C RATING) 100 75 50 25 Derating Curve \ 50 100 150 200 TEMPERATURE (C) PRINTED IN U.S.A.TVS305-TVS430 TVS505-TVS528 3. Peak Pulse Power vs. Pulse Duration 4. Peak Pulse Power vs. Pulse Duration 10 T T 100 T v T N\ EXPONENTIAL (WAVE FORM SEE FIGURE 1) PULSE \ MAX, DUTY CYCLE = 0.1% = = NX =x zo NS 10 NX cea ww wi N\ z N 5 TVS305 series a TVS505 series in 3 n J > = = a ol NS o 4 ae a N | N\ a 01 a lS 1pS 10uS 100uS ims 10mS us 1uS 10uS 100uS ims i0ms PULSE TIME (t.) PULSE TIME (t,) 5. Capacitance vs. Stand-Off Voltage 6. Clamping Voltage vs. Pulse Current 10,000 100 El 50 S 40 30 Ww Q F 20 = 3 5 > x 1000 2 10 a = | 3 5 _ a 4 ve 3 > 2 MEASURED @ V, 1 10 100 1 1 2 5 10 20 50 100 1, PULSE CURRENT (A) V, STAND-OFF VOLTAGE (V) UNITRODE CORPORATION 5 FORBES ROAD LEXINGTON, MA 02173 TEL. (617) 861-6540 TWX (710) 326-6509 TELEX 95-1064 500 PRINTED IN U.S.A.TVS305-TVS430 TVS505-TVS528 CHOOSING AND SPECIFYING THE PROPER TVS The following terms are generally used in specifying Transient Voltage Suppressors (TVS): 1. Stand-off Voltage (Vz) is the highest reverse voltage at which the TVS will be non-conducting. 2. Minimum Breakdown Voltage (BV min) is the reverse voltage at which the TVS conducts 1 milli-amp. This is the point where the TVS begins to limit the transient. 3, Maximum Clamping Voltage (V_ max) is the maximum voltage the TVS will allow during a transient spike. Figure 7 graphically shows all three terms. Reverse Current + Figure 7 The three most important factors in choosing the appropriate TVS for an application in their order of importance are: 1, Pulse power (P-) - Choose the TVS series that will handle the Transient Pulse Power. Transient Pulse Power is equa! to the clamping voltage (V-) times the peak pulse current (ip). The pulse duration vs. pulse power graph on the TVS data sheet can then be used to determine the maximum allowable pulse duration. (Figure 3 or 4). 2. Standoff voltage (Ve) From the TVS series selected, choose the device with the stand-off voltage equal to or greater than the normal circuit operating voltage. 3. Maximum Clamping Voltage (Vcmax) Determine the clamping voltage of the device chosen for the transient given and be sure it is below the voltage that might damage any components. For further information see Unitrode Application Note U-79, Guidelines for Using Transient Voltage Suppressors. UNITRODE CORPORATION + 5 FORBES ROAD LEXINGTON, MA 02173 TEL. (617) 861-6540 501 TWX (710) 326-6509 TELEX 95-1064 PRINTED IN U.S.A.