TO-220AB THERMOTAB TO-218AC FASTPAK TO-218X MT2 MT1 General Description Teccor offers bidirectional alternistors with current ratings from 6 to 40 amperes with voltages from 200 to 800 volts as part of Teccor's broad line of thyristors. Teccor's alternistor has been specifically designed for applications which are required to switch highly inductive loads. To accomplish this, a special chip has been designed which effectively offers the same performance as two thyristors (SCRs) wired inverse parallel (back-to-back); hence, the alternistor has better turn-off behavior than a standard triac. An alternistor may be triggered from a blocking to conduc- tion state for either polarity of applied AC voltage with operating modes in Quadrants |, Il, and Ill. This new chip construction provides two electrically separate SCR structures, providing enhanced dv/dt characteristics while retaining the advantages of a single chip device. All alternistors have glass-passivated junctions to ensure long term reliability and parameter stability. Teccor's glass offers a reli- able barrier against junction contamination. These alternistors are offered in four basic package configura- tions: TO-218X, TO-218AC, FastPak, and TO-220AB. Teccor's TO-218X package has been designed for heavy, steady power- (6 40 Amps) handling capability. The TO-218X features large eyelet terminals for ease of soldering heavy gauge hook-up wire. All the isolated packages have a standard isolation voltage rating of 2500Vays. Variations of devices covered in this data sheet are available for custom design applications. Please consult factory for further information. Features High surge current capability * Glass-passivated junctions + 2500VAC isolation for L, J, P, and K High commutating dv/dt * High static dv/dt Teccor Electronics, Inc. 4-1 (972) 580-7777 Alternistor Triacslectrical ec ifications Part Number It(RMS) Isolated Non-Isolated] VorM let IpRM Vet RMS Repetitive DC Gate Trigger Peak Off-State De Gate On-State Peak Current in Current Gate Open Trigger Current Blocking Specific Operating Vorm=Max Voltage Conduction Voltage Quadrants Rated Value Vp=12VDC Angle of (1) Vo-12vDce (1) (18) (2) (6) 360 (3) (7) (15) (17) (15) (17) (4)(16) THERMOTAB] TO-218AC | TO-218x | FASTPAK | TO-220AB mAmps mAmps Volts T0-220AB (16) TO-3 BASE To= | To= | To= | To= | To= Volts al | an | am | 25C | 100C} 125 | 125C] 25C MAX See Package Dimensions section for variations. (11) MIN MAX MAX MIN | MAX Q2006LH4 Q2006RH4 | 200 35 | 35 | 35 | 001 | o5 | 20 | 02 | 15 Q4006LH4 a4006RH4 | 400 35 | 35 | 35 | 001 | o5 | 20 | 02 | 15 6 Q5006LH4 Q5006RH4 | 500 35 | 35 | 35 | 001 | o5 | 20 | 02 | 15 Amps | Qeoo6LH4 Qe006RH4 | 600 35 | 35 | 35 | 001 | 05 | 20 | o2 | 15 Q7006LH4 a7006RH4 | 700 35 | 35 | 35 | 001 | o5 | 20 | 02 | 15 Q8006LH4 qso06RH4 | 800 35 | 35 | 35 | 001 | o5 | 20 | 02 | 15 Q2008LH4 qQ2008RH4 | 200 35 | 35 | 35 | 001 | o5 | 20 | 02 | 15 Q4008LH4 a4o0sRH4 | 400 35 | 35 | 35 | 001 | o5 | 20 | 02 | 15 8 Q5008LH4 q500sRH4 | 500 35 | 35 | 35 | 001 | o5 | 20 | 02 | 15 Amps | qeoosLH4 qso0sRH4 | 600 35 | 35 | 35 | 001 | o5 | 20 | 02 | 15 Q7008LH4 a7o0sRH4 | 700 35 | 35 | 35 | 001 | o5 | 20 | 02 | 15 Q8008LH4 qso0sRH4 | 800 35 | 35 | 35 | 001 | o5 | 20 | 02 | 15 Q2010LH5 Q2010RH5 | 200 50 | 50 | 50 | 001 | o5 | 20 | o2 | 15 Q4010LH5 Q4010RH5 | 400 50 | 50 | 50 | 001 | o5 | 20 | o2 | 15 10 Q5010LH5 Q5010RH5 | 500 50 | 50 | 50 | 001 | o5 | 20 | o2 | 15 Amps | Qe6010LHs Q6010RH5 | 600 50 | 50 | 50 | 001 | 05 | 20 | o2 | 15 Q7010LH5 Q7010RH5 | 700 50 | 50 | 50 | 001 | o5 | 20 | o2 | 15 Q8010LH5 Q8010RH5 | 800 50 | 50 | 50 | 001 | o5 | 20 | o2 | 15 Q2012LH5 Q2012RH5 | 200 50 | 50 | 50 | 001 | o5 | 20 | o2 | 15 Q4012LH5 Q4012RH5 | 400 50 | 50 | 50 | 001 | o5 | 20 | o2 | 15 12 Q5012LH5 Q5012RH5 | 500 50 | 50 | 50 | 001 | o5 | 20 | o2 | 15 Amps | q6012LH5 Q6012RH5 | 600 50 | 50 | 50 | 001 | o5 | 20 | o2 | 15 Q7012LH5 Q7012RH5 | 700 50 | 50 | 50 | 001 | o5 | 20 | o2 | 15 Q8012LH5 Q8012RH5 | 800 50 | 50 | 50 | 001 | o5 | 20 | o2 | 15 Q2015L6 Q2015R6 200 go | 80 | so | o5 | o5 | 20 | o2 | 25 Q4015L6 Q4015R6 400 so | so | so | o5 | o5 | 20 | 02 | 25 15 Q5015L6 Q5015R6 500 so | so | so | o5 | o5 | 20 | 02 | 25 Amps Q6015L6 Q6015R6 600 so | so | so | o5 | o5 | 20 | 02 | 25 Q7015L6 Q7015R6 700 30 | 80 | 80 | 0.1 to | 30 | 02 | 25 Q8015L6 Q8015R6 800 so | so | so | 0.1 10 | 30 | o2 | 25 q2025L6 | a2025K6e | a2025J6 q2025P | @2025R6 200 so | so | so | o5 | o5 | 20 | 02 | 25 a4025L6 | Q4025Ke | @4025J6 a4025P | @4025R6 400 so | so | so | o5 | o5 | 20 | 02 | 25 25 q5025L6 | @s5025K6 | @5025J6 @5025P | Qs5025R6 500 go | 80 | so | o5 | o5 | 20 | o2 | 25 Amps qso25L6 | Qeo25Ke | ae025J6 qaso25P | Qeo025R6 600 so | so | so | o5 | o5 | 20 | 02 | 25 a7025L6 | a7025K6e | @7025J6 a7025P | Q7025R6 700 so | so | so | 0.1 10 | 30 | o2 | 25 qso25L6 | aso25Ke | as025J6 qso25P | as025R6 800 so | so | so | 0.1 10 | 30 | o2 | 25 Q2040K7 | @2040J7 Q2040P 200. | 100|100|100| 02 | 20 | 50 | o2 | 25 @4040K7 | @4040J7 @4040P 400 |100/100/100/ o2 | 20 | 50 | o2 | 25 40 @5040K7 | @5040J7 @5040P 500 |100|100/100/ o2 | 20 | 50 | o2 | 25 Amps q6040K7 | @6040J7 Q6040P 600 | 100 | 100/100! o2 | 20 | 50 | o2 | 25 Q7040K7 | @7040J7 Q7040P 700 | 100|100|100| 02 | 20 | 50 | o2 | 25 q8040K7_| @s040J7 300 |100|100/100/ o2 [| 20 | 50 | o2 | 25 See General Notes and Electrical Specification Notes on page 4-4. Alternistor Triacs 4-2 Teccor Electronics, Inc. (972) 580-7777ternistor Triacs Vim ly Ietm Pem Peay) hsm dv/dt (c) dv/dt tgt It di/dt Peak Holding | Peak Gate} Peak Gate | Average Peak One Critical Rate-of-Rise Critical Gate RMS Surge | Maximum On-State Current Trigger Power | Gate Power Cycle of Commutation Voltage | Rate-of-Rise of | Controlled (Non- Rate -of- Voltage at (DC) Current | Dissipation | Dissipation Surge at Rated Off State Turn-On Repetitive) Change Max Rated |GateOpen| (14) (14) (9) (13) Vorm and hyams) Voltage at Time On-State | of On-State RMS Current | (1) (8) (12) lat Slat Commutating di/dt=0.54 | Rated Vorm |igp=300mA] Current for | Current To = 25C Rated lraus)/ms Gate Open | 0.1ps Rise | _ period of (19) (1) (5) Gate Unenergized (1) Time 8.3 ms Amps (1) (4) (13) Volts/Sec (10) for Fusing Tc= | To= Volts mAmps Amps Watts Watts 60Hz | 50Hz Volts/uSec 100C | 125C pSec Amps?Sec_ | Amps/uSec MAX MAX MIN MIN TYP 1.6 35 1.6 18 0.5 65 60 20 750 600 4 17.5 70 1.6 35 1.6 18 0.5 65 60 20 575 450 4 17.5 70 1.6 35 1.6 18 0.5 65 60 20 500 400 4 17.5 70 1.6 35 1.6 18 0.5 65 60 20 425 350 4 17.5 70 1.6 35 1.6 18 0.5 65 60 20 375 300 4 17.5 70 1.6 35 1.6 18 0.5 65 60 20 300 250 4 17.5 70 1.6 35 2.0 20 0.5 85 80 25 750 600 4 30 70 1.6 35 2.0 20 0.5 85 80 25 575 450 4 30 70 1.6 35 2.0 20 0.5 85 80 25 500 400 4 30 70 1.6 35 2.0 20 0.5 85 80 25 425 350 4 30 70 1.6 35 2.0 20 0.5 85 80 25 375 300 4 30 70 1.6 35 2.0 20 0.5 85 80 25 300 250 4 30 70 1.6 50 2.0 20 0.5 110 | 100 30 1150 1000 4 50 70 1.6 50 2.0 20 0.5 110 | 100 30 1000 750 4 50 70 1.6 50 2.0 20 0.5 110 | 100 30 925 700 4 50 70 1.6 50 2.0 20 0.5 110 | 100 30 850 650 4 50 70 1.6 50 2.0 20 0.5 110 | 100 30 775 600 4 50 70 1.6 50 2.0 20 0.5 110 | 100 30 650 500 4 50 70 1.6 50 2.0 20 0.5 120 110 30 1150 1000 4 60 70 1.6 50 2.0 20 0.5 120 110 30 1000 750 4 60 70 1.6 50 2.0 20 0.5 120 110 30 925 700 4 60 70 1.6 50 2.0 20 0.5 120 110 30 850 650 4 60 70 1.6 50 2.0 20 0.5 120 110 30 775 600 4 60 70 1.6 50 2.0 20 0.5 120 110 30 650 500 4 60 70 1.6 70 2.0 20 0.5 200 | 167 30 875 600 5 166 100 1.6 70 2.0 20 0.5 200 | 167 30 875 600 5 166 100 1.6 70 2.0 20 0.5 200 | 167 30 800 520 5 166 100 1.6 70 2.0 20 0.5 200 | 167 30 800 520 5 166 100 1.6 70 2.0 20 0.5 200 | 167 30 700 475 5 166 100 1.6 70 2.0 20 0.5 200 | 167 30 700 475 5 166 100 1.8 100 2.0 20 0.5 250 | 208 30 875 600 5 259 100 1.8 100 2.0 20 0.5 250 | 208 30 875 600 5 259 100 1.8 100 2.0 20 0.5 250 | 208 30 800 520 5 259 100 1.8 100 2.0 20 0.5 250 | 208 30 800 520 5 259 100 1.8 100 2.0 20 0.5 250 | 208 30 700 475 5 259 100 1.8 100 2.0 20 0.5 250 | 208 30 700 475 5 259 100 1.8 120 4.0 40 0.8 400 | 335 50 1100 700 5 664 150 1.8 120 4.0 40 0.8 400 | 335 50 1100 700 5 664 150 1.8 120 4.0 40 0.8 400 | 335 50 1000 625 5 664 150 1.8 120 4.0 40 0.8 400 | 335 50 1000 625 5 664 150 1.8 120 4.0 40 0.8 400 | 335 50 900 575 5 664 150 1.8 120 4.0 40 0.8 400 | 335 50 900 575 5 664 150 See General Notes and Electrical Specification Notes on page 4-4. Teccor Electronics, Inc. 4-3 Alternistor Triacs (972) 580-7777lectrical cations General Notes All measurements are made at 60Hz with a resistive load at an ambient temperature of +25C unless specified otherwise. + Operating temperature range (Ty) is -40C to +125C except 0C to +125C for FastPaks. + Storage temperature range (Tg) is -40C to +125C except -20C to +125C for FastPaks. + Lead solder temperature is a maximum of 230C for 10 seconds maximum = 1/16" (1.59mm) from case. + The case temperature (Tc) is measured as shown on the dimen- sional outline drawings. See Package Dimensions section of this catalog. Electrical Specification Notes (1) For either polarity of MT2 with reference to MT1 terminal. (2) For either polarity of gate voltage (Vg7) with reference to MT1 ter- minal. (3) See Definition of Quadrants. (4) See Figures 4.1 through 4.4 for current rating at specific operating temperature. 5) See Figures 4.5 and 4.6 for i; and vr. 6) See Figure 4.7 for Vez vs Te. 7) See Figure 4.8 for let vs Tc. 8 ) See Figure 4.9 for I, vs Te. 9) See Figures 4.10 and 4.11 for surge rating with specific durations. 10) See Figure 4.12 for ty; vs I@r. 11) See package outlines for lead form configurations. When ordering special lead forming, add type number as suffix to part number. (12) Initial on-state current = 400 mA(DC) for 15-40A devices and 100mA for 6-12 Amp devices. (13) See Figures 4.1 through 4.4 for maximum allowable case temper- ature at maximum rated current. (14) Pulse width < 10us. (15) For 6-12 Amp devices, R, = 600; 15 Amp and above, R, = 300 (16) 40 Amp pin terminal leads on K package can run 100C to 125C. (17) Alternistor does not turn on in Quadrant IV. ( ( ( ( ( ( ( ( ( 18) T, = Ty for test conditions in off-state 19) Ig7 = 200 mA for 6-12 Amp devices and 500 mA for 15-40 Amp devices with gate pulse having rise time of < 0.1 microsecond. Gate Characteristics Teccor triacs may be turned on in the following ways: * With in-phase signals (using standard AC line) Quadrants | and Ill are used. * By applying unipolar pulses (gate always negative)with nega- tive gate pulses Quadrants II and III are used. In all cases, if maximum surge capability is required, gate pulses should be a minimum of one magnitude above minimum lz rat- ing with a steep rising waveform (<1us rise time). ALL POLARITIES ARE REFERENCED TO MT1 MT2 POSITIVE (Positive Half Cycle) + MT2 MT2 GATE GATE JL a MT1 MT1 REF REF | Qilal +1 GT GT MT2 Qilaiv wre UU U on let GATE GATE JL MT1 MT1 REF MT2 NEGATIVE REF (Negative Half Cycle) NOTE: Alternistors will not operate in Q IV Definition of Quadrants Electrical isolation Teccors isolated Alternistor packages will withstand a minimum high potential test of 2500 VAC (RMS) from leads to mounting tab, over the operating temperature range of the device. See iso- lation table below for standard and optional isolation ratings. ELECTRICAL ISOLATION FROM LEADS TO MOUNTING TAB * VAC Isolated Isolated Isolated Isolated (RMS) TO-218AC FASTPAK TO-220AB TO-218X 2500 Standard Standard Standard Standard 4000 N/A N/A Optional * N/A * For 4000V isolation, use V suffix in part number. ** UL Recognized File E71639 THERMAL RESISTANCE (Steady State) Rose C/W(TYP) K P L R J QO MT2 [2] Type MTt fot G iz wm | ll und UY, ~~ MT1 we MT1 MT1 MT2 lsolated** FastPak** Isolated** Non-lsolated lsolated** TO-218AC TO-3BASE THERMOTAB TO-220AB TO-218X TO-220AB 6 amps 3.3 [50] 2.1 [45] 8 amps 2.8 1.8 10 amps 2.6 1.5 12 amps 2.3 1.4 15 amps 2.1 1.3 25 amps 1.35 1.3 2.0 14 1.32 40 amps 0.97 0.9 0.95 ** UL Recognized Product per UL File E71639. Alternistor Triacs Teccor Electronics, Inc. (972) 580-7777Iternistor Triacs 130 1 1 Q 130 oO CURRENT WAVEFORM: Sinusoidal 1 T T T LOAD: Resistive or Inductive 3 10 AMP TO-220 (NON-ISOLATED) py 120 SS CONDUCTION ANGLE: 360 AS 120 4 ri ri we CASE TEMPERATURE: Measured as. D | | Oo 410 shown on Dimensional Drawing 5 t10 12 AMP TO-220 (ISOLATED) 2 = ASQ \ / 8 100 = 100 Se MSs 5 40 AMP FASTPAK & ec 6 AMP TO-220 NY Tk / 5 eo | _ TO-218 (ISOLATED) 90 (NON-ISOLATED) he o a I I o oO 6 AMP TO -220 (ISOLATED)) 3 80__(|_25 AMP FASTPAK 80 | | | g TO-220 (NON-ISGLATED) a | & & TO-218 (ISOLATED) Zz 70 CURRENT WAVEFORM: Sinusoidal < 7 | = LOAD: Resistive or Inductive 5 25 AMP TO-220 (ISOLATED) E 60 CONDUCTION ANGLE: 360 60 3 [ CASE TEMPERATURE: Measured as a shown on Dimensional Drawing = & 0 | | | = 0 2 4 6 8 10 12 14 % 20 = 40 = RMS On-State Current [It(RMg)l - AMPS RMS On-State Current [[rams) - AMPS Figure 4.1. Maximum Allowable Case Temperature vs On-State Figure 4.4 Maximum Allowable Case Temperature vs On-State 9 p 9 p Current (6-12 Amp Devices) Current (25 and 40 Amp Devices) 130 10 AMP TO-220 (ISOLATED) 120 ; t t 2 | 3 g 110 ~~ 42 AMP TO-220 (NON-ISOLATED) 84 oOo | / wi 2, SS ic aH 100 g tL 6 to 12 Devices 6 O 8 AMP TO-220 SL oF BE gg |_{NON-ISOLATED) |_- a =o I I ot 5 8 AMP TO -220 (ISOLATED) 0 Ew 980 | | 65 25 | | 60 Eo . . Zo % Ee 70 CURRENT WAVEFORM: Sinusoidal . 3 Ro LOAD: Resistive or Inductive a 2r CONDUCTION ANGLE: 360 g* 80 | GASE TEMPERATURE: Measured as 5 > shown on Dimensional Drawing 8 0 | | | a 0 06 #08 10 12 14 16 0 2 4 6 8 10 12 14 Positive or Negative Instantaneous RMS On-State Current [I - AMPS rams) On-State Voltage (v7)Volts Figure 4.2 Maximum Allowable Case Temperature vs On-State Figure 4.5 On-State Current vs On-State Voltage (Typical 9 p 9 g yp Current (8-12 Amp Devices) (6-12 Amp Devices) 130 90 > 120 DS a 80 : SA W'S 4 wa @ A 110 LP x5 GE 7 5.0 259 gE oe 13 Non, Sl 60 zg 100 Ans 80g 2e =z 5 am 7Ep g e 50 E 90 So Oe 4 40 3S g | "8D 2 EE Bo } oH 20 x @ | gn So 70 /CURRENT WAVEFORM: Sinusoidal ZS og oO LOAD: Resistive or Inductive 2 oO CONDUCTIVE ANGLE: 360 10 O 60 }- CASE TEMPERATURE: Measured as 4 shown on Dimensional Drawing 0 0 + ; + 10 + 15 Oo 0.6 08 1.0 12 14 1.6 1.8 Positive or Negative Instantaneous On-State Voltage (v7)Volts RMS On-State Current [It(Rms)] Amps Figure 4.3 Maximum Allowable Case Temperature vs On-State Figure 4.6 On-State Current vs On-State Voltage (Typical) Current (15 Amp Devices) (15-40 Amp Devices) Teccor Electronics, Inc. 4-5 Alternistor Triacs (972) 580-7777ons 200 5 GATE CONTROL MAY BE LOST 120 12 Amp Device DURING AND IMMEDIATELY wo 4 FOLOWING SURGE CURRENT Q 100 | INTERVAL, ee = 10 Amp Device [{ gee ones noe near > et 60 im } HAS RETURNED TO STEADY STATE oO = | 50 ee [ RATED VALUE. lo 2 40 el | | eB SSS x 2 F 20 8 Amp Device PA ee ~ o = 7 AL Tt by = 5 6 Amp Device Pp ee > Or 49 ae Os o sO 8 Ay 6 a x w 5 & oH 4 og 3 o SUPPLY FREQUENCY: 60 Hz Sinusoidal 2 | LOAD: Resistive RMS ON-STATE CURRENT [I 4]: Mi 65 -40 -15 +25 +65 +125 Rated Value at Specified case erature _ 1 Poti it iit 114 Case Temperature (Tc) c 1 2 3456 810 20 3040 60 80100 200 300 600 1000 Surge Current Duration Full Cycles Figure 4.7. Normalized DC Gate Trigger Voltage for all Quadrants vs Figure 4.10 Peak Surge Current vs Surge Current Duration Case Temperature (6-12 Amp Devices) 1000 Ty ttt I I a I I 1 a 4.0 1 a SUPPLY FREQUENCY: 60Hz Sinusoidal q 1 oe LOAD: Resistive 7 o 1 2 400 RMS ON-STATE CURRENT [I4(a445)]: Maximum to 30 i = | 300 Rated Value at Specified Case Temperature N . o-~ a 4 1 Q > 250 mt B1o NG 2% wl Saupe | = {Ee ce a ~~ c 1 ct ~~ nt ot 40 FE 20 ? 3 = 100 ~~ rr AMp Oo I i 2 80 = we I m> 60 ee I IN 5 O 50 tNotes 1) GATE CONTROL MAY BE LOST mL | 1.0 1 QO 40 DURING AND IMMEDIATELY PP Ss [ene x wo FOLLOWING SURGE CURRENT % x 30> __ INTERVAL. oc ! | g n 2) OVERLOAD MAY NOT BE 1S 4 a | ! GQ & 20+ = REPEATED UNTIL JUNCTION Mp - 0 , TO STEADY-STATE RATED VALUE | -65 40 -15 +25 +65 4125 to LE LE LLL L | | Case Temperature (Tg) C 1 10 100 1000 Surge Current Duration Full Cycles Figure 4.8 Normalized DC Gate Trigger Current for all Quadrants vs Figure 4.11 Peak Surge Current vs Surge Current Duration Case Temperature (15-40 Amp Devices) 4.0 1 10 ee | 1| INITIAL ON-STATE CURRENT c 2 ~ 1| = 400mA (DC) 15-40A devices of 8 O 3.0 ,{_= 100mA (DC) 6-12A devices : n | . o cat Devices with I> = 80 - 100mA =|9 5 =) 7 2 N 1 Fe 6 aol Na ae 1 NX Zw 4 o ONY Qe 2 10 ' re oc I h~J 2 a :; ~~] Devices with I,7 = 35 - 50mA 0 1 6 65-40-15 +25 +65 +125 0 100 200 300 400 500 Case Temperature (To) C DC Gate Trigger Current (Ig 7)mA Figure 4.9 Normalized DC Holding Current vs Case Temperature Figure 4.12 Turn-On Time vs Gate Trigger Current (Typical) Alternistor Triacs 4-6 Teccor Electronics, Inc. (972) 580-7777ternistor Triacs Average On-State Power Dissipation [PEp(ayjt-Waitts L o Y\ / 6 - 12 AMP CURRENT WAVEFORM: Sinusoidal LOAD: Resistive or Inductive 4 CONDUCTION ANGLE: 360 | | | | | 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 RMS On-State Current [H(RMs)lAMPS (6-12 Figure 4.13 Power Dissipation (Typical) vs On-State Current Amp Devices) 1 1 nm oS Average On-State Power Dissipation [Pp (ayy Watts 8 CURRENT WAVEFORM: Sinusoidal 6 FLOAD: Resisti ve or inductive CONDUCTION ANGLE: 360 ao oO NM FF OD RMS On-State Current ly(RMsy Amps Figure 4.14 Power Dissipation (Typical) vs On-State Current (15 Amp Devices) Average On-State Power Dissipation [Poyavyt Watts Q 0 4 8 #12 16 20 24 28 32 36 40 CURRENT WAVEFORM: Sinusoidal [ LOAD: Resistive or Inductive CONDUCTION ANGLE: 360 AA LL 25 AMP LA AZ 40 AMP LZ RMS On-State Current (l+RMs)lAmps Figure 4.15 Power Dissipation (Typical) vs On-State Current (25a nd 40 Amp Devices) Teccor Electronics, Inc. (972) 580-7777 4-7 Alternistor Triacs