1.5SMC6.8AT3G Series, SZ1.5SMC6.8AT3G Series 1500 Watt Peak Power Zener Transient Voltage Suppressors Littelfuse.com Unidirectional* The SMC series is designed to protect voltage sensitive components from high voltage, high energy transients. They have excellent clamping capability, high surge capability, low zener impedance and fast response time. The SMC series is supplied in the exclusive, cost-effective, highly reliable Littelfuse package and is ideally suited for use in communication systems, automotive, numerical controls, process controls, medical equipment, business machines, power supplies and many other industrial/consumer applications. SURFACE MOUNT ZENER OVERVOLTAGE TRANSIENT SUPPRESSORS 5.8 - 78 VOLTS 1500 WATT PEAK POWER SMC CASE 403 Specification Features * * * * * * * * * * * Working Peak Reverse Voltage Range - 5.8 to 77.8 V Standard Zener Breakdown Voltage Range - 6.8 to 91 V Peak Power - 1500 W @ 1.0 ms ESD Rating of Class 3 (> 16 kV) per Human Body Model Maximum Clamp Voltage @ Peak Pulse Current Low Leakage < 5.0 mA Above 10 V UL 497B for Isolated Loop Circuit Protection Maximum Temperature Coefficient Specified Response Time is Typically < 1.0 ns SZ Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC-Q101 Qualified and PPAP Capable These are Pb-Free Devices are Available** Cathode Anode MARKING DIAGRAM xxxA A Y WW G = Specific Device Code (See Table on Page 3) = Assembly Location = Year = Work Week = Pb-Free Package (Note: Microdot may be in either location) Mechanical Characteristics CASE: Void-free, transfer-molded, thermosetting plastic FINISH: All external surfaces are corrosion resistant and leads are readily solderable MAXIMUM CASE TEMPERATURE FOR SOLDERING PURPOSES: 260C for 10 Seconds LEADS: Modified L-Bend providing more contact area to bond pads POLARITY: Cathode indicated by molded polarity bend MOUNTING POSITION: Any ORDERING INFORMATION Device*** Package Shipping 1.5SMCxxxAT3G SMC (Pb-Free) 2,500 / Tape & Reel SZ1.5SMCxxxAT3G SMC (Pb-Free) 2,500 / Tape & Reel ***The "T3" suffix refers to a 13 inch reel. **Bidirectional devices will not be available in this series. Individual devices are listed on page 3 of this data sheet. Specifications subject to change without notice. (c) 2016 Littelfuse, Inc. September 19, 2016 - Rev. 11 1 Publication Order Number: 1.5SMC6.8AT3/D 1.5SMC6.8AT3G Series, SZ1.5SMC6.8AT3G Series MAXIMUM RATINGS Symbol Value Unit Peak Power Dissipation (Note 1) @ TL = 25C, Pulse Width = 1 ms Rating PPK 1500 W DC Power Dissipation @ TL = 75C Measured Zero Lead Length (Note 2) Derate Above 75C Thermal Resistance, Junction-to-Lead PD 4.0 W RqJL 54.6 18.3 mW/C C/W W mW/C C/W DC Power Dissipation (Note 3) @ TA = 25C Derate Above 25C Thermal Resistance from Junction-to-Ambient PD RqJA 0.75 6.1 165 Forward Surge Current (Note 4) @ TA = 25C IFSM 200 A TJ, Tstg -65 to +150 C Operating and Storage Temperature Range Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. 1. 10 X 1000 ms, non-repetitive 2. 1 in. square copper pad, FR-4 board 3. FR-4 board, using Littelfuse minimum recommended footprint, as shown in 403 case outline dimensions spec. 4. 1/2 sine wave (or equivalent square wave), PW = 8.3 ms, duty cycle = 4 pulses per minute maximum. ELECTRICAL CHARACTERISTICS (TA = 25C unless otherwise noted, VF = 3.5 V Max. @ IF (Note 5) = 100 A) IPP Maximum Reverse Peak Pulse Current VC Clamping Voltage @ IPP IR VBR IT QVBR IF Parameter Symbol VRWM I VC VBR VRWM Working Peak Reverse Voltage Maximum Reverse Leakage Current @ VRWM IR VF IT V Breakdown Voltage @ IT Test Current Maximum Temperature Coefficient of VBR IF Forward Current VF Forward Voltage @ IF IPP Uni-Directional TVS 5. 1/2 sine wave or equivalent, PW = 8.3 ms non-repetitive duty cycle Specifications subject to change without notice. (c) 2016 Littelfuse, Inc. September 19, 2016 - Rev. 11 2 Publication Order Number: 1.5SMC6.8AT3/D 1.5SMC6.8AT3G Series, SZ1.5SMC6.8AT3G Series ELECTRICAL CHARACTERISTICS Device* Device Marking VC @ IPP (Note 8) Breakdown Voltage VRWM (Note 6) IR @ VRWM @ IT VC IPP QVBR V mA Min Nom Max mA V A %/5C VBR V (Note 7) 1.5SMC6.8AT3G 1.5SMC7.5AT3G 1.5SMC8.2AT3G 6V8A 7V5A 8V2A 5.8 6.4 7.02 1000 500 200 6.45 7.13 7.79 6.8 7.5 8.2 7.14 7.88 8.61 10 10 10 10.5 11.3 12.1 143 132 124 0.057 0.061 0.065 1.5SMC10AT3G 1.5SMC12AT3G 1.5SMC13AT3G 10A 12A 13A 8.55 10.2 11.1 10 5 5 9.5 11.4 12.4 10 12 13 10.5 12.6 13.7 1 1 1 14.5 16.7 18.2 103 90 82 0.073 0.078 0.081 1.5SMC15AT3G 1.5SMC16AT3G 1.5SMC18AT3G 1.5SMC20AT3G 15A 16A 18A 20A 12.8 13.6 15.3 17.1 5 5 5 5 14.3 15.2 17.1 19 15 16 18 20 15.8 16.8 18.9 21 1 1 1 1 21.2 22.5 25.2 27.7 71 67 59.5 54 0.084 0.086 0.088 0.09 1.5SMC22AT3G 1.5SMC24AT3G 1.5SMC27AT3G 1.5SMC30AT3G 22A 24A 27A 30A 18.8 20.5 23.1 25.6 5 5 5 5 20.9 22.8 25.7 28.5 22 24 27 30 23.1 25.2 28.4 31.5 1 1 1 1 30.6 33.2 37.5 41.4 49 45 40 36 0.092 0.094 0.096 0.097 1.5SMC33AT3G 1.5SMC36AT3G 1.5SMC39AT3G 1.5SMC43AT3G 33A 36A 39A 43A 28.2 30.8 33.3 36.8 5 5 5 5 31.4 34.2 37.1 40.9 33 36 39 43 34.7 37.8 41 45.2 1 1 1 1 45.7 49.9 53.9 59.3 33 30 28 25.3 0.098 0.099 0.1 0.101 1.5SMC47AT3G 1.5SMC51AT3G 1.5SMC56AT3G 1.5SMC62AT3G 47A 51A 56A 62A 40.2 43.6 47.8 53 5 5 5 5 44.7 48.5 53.2 58.9 47 51 56 62 49.4 53.6 58.8 65.1 1 1 1 1 64.8 70.1 77 85 23.2 21.4 19.5 17.7 0.101 0.102 0.103 0.104 1.5SMC68AT3G 1.5SMC75AT3G 1.5SMC82AT3G 1.5SMC91AT3G 68A 75A 82A 91A 58.1 64.1 70.1 77.8 5 5 5 5 64.6 71.3 77.9 86.5 68 75 82 91 71.4 78.8 86.1 95.5 1 1 1 1 92 103 113 125 16.3 14.6 13.3 12 0.104 0.105 0.105 0.106 Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions. 6. A transient suppressor is normally selected according to the working peak reverse voltage (VRWM), which should be equal to or greater than the DC or continuous peak operating voltage level. 7. VBR measured at pulse test current IT at an ambient temperature of 25C. 8. Surge current waveform per Figure 2 and derate per Figure 3 of the General Data - 1500 Watt at the beginning of this group. * Include SZ-prefix devices where applicable. Specifications subject to change without notice. (c) 2016 Littelfuse, Inc. September 19, 2016 - Rev. 11 3 Publication Order Number: 1.5SMC6.8AT3/D 1.5SMC6.8AT3G Series, SZ1.5SMC6.8AT3G Series NONREPETITIVE PULSE WAVEFORM SHOWN IN FIGURE 2 PULSE WIDTH (tP) IS DEFINED AS THAT POINT WHERE THE PEAK CURRENT DECAYS TO 50% OF IPP. tr 10 ms 100 10 PEAK VALUE - IPP VALUE (%) Ppk, PEAK POWER (kW) 100 HALF VALUE 50 1 IPP 2 tP 0.1 0.1 ms 1 ms 10 ms 100 ms 1 ms 10 ms 0 0 1 2 3 4 tP, PULSE WIDTH t, TIME (ms) Figure 1. Pulse Rating Curve Figure 2. Pulse Waveform 1000 140 IT, TEST CURRENT (AMPS) PEAK PULSE DERATING IN % OF PEAK POWER OR CURRENT @ TA = 25 C 160 120 100 80 60 40 20 0 0 25 50 75 100 125 150 500 VBR(NOM)=6.8TO13V 20V 43V 24V 75V TL=25C tP=10ms 200 100 120V 50 180V 20 10 5 2 1 0.3 0.5 0.7 1 2 3 5 7 10 20 30 DVBR, INSTANTANEOUS INCREASE IN VBR ABOVE VBR (NOM) (VOLTS) TA, AMBIENT TEMPERATURE (C) Figure 4. Dynamic Impedance Figure 3. Pulse Derating Curve UL RECOGNITION including Strike Voltage Breakdown test, Endurance Conditioning, Temperature test, Dielectric Voltage-Withstand test, Discharge test and several more. Whereas, some competitors have only passed a flammability test for the package material, we have been recognized for much more to be included in their Protector category. The entire series has Underwriters Laboratory Recognition for the classification of protectors (QVGQ2) under the UL standard for safety 497B and File #E128662 . Many competitors only have one or two devices recognized or have recognition in a non-protective category. Some competitors have no recognition at all. With the UL497B recognition, our parts successfully passed several tests Specifications subject to change without notice. (c) 2016 Littelfuse, Inc. September 19, 2016 - Rev. 11 4 Publication Order Number: 1.5SMC6.8AT3/D 1.5SMC6.8AT3G Series, SZ1.5SMC6.8AT3G Series APPLICATION NOTES Response Time minimum lead lengths and placing the suppressor device as close as possible to the equipment or components to be protected will minimize this overshoot. Some input impedance represented by Zin is essential to prevent overstress of the protection device. This impedance should be as high as possible, without restricting the circuit operation. In most applications, the transient suppressor device is placed in parallel with the equipment or component to be protected. In this situation, there is a time delay associated with the capacitance of the device and an overshoot condition associated with the inductance of the device and the inductance of the connection method. The capacitive effect is of minor importance in the parallel protection scheme because it only produces a time delay in the transition from the operating voltage to the clamp voltage as shown in Figure 5. The inductive effects in the device are due to actual turn-on time (time required for the device to go from zero current to full current) and lead inductance. This inductive effect produces an overshoot in the voltage across the equipment or component being protected as shown in Figure 6. Minimizing this overshoot is very important in the application, since the main purpose for adding a transient suppressor is to clamp voltage spikes. The SMC series have a very good response time, typically < 1.0 ns and negligible inductance. However, external inductive effects could produce unacceptable overshoot. Proper circuit layout, Specifications subject to change without notice. (c) 2016 Littelfuse, Inc. September 19, 2016 - Rev. 11 Duty Cycle Derating The data of Figure 1 applies for non-repetitive conditions and at a lead temperature of 25C. If the duty cycle increases, the peak power must be reduced as indicated by the curves of Figure 7. Average power must be derated as the lead or ambient temperature rises above 25C. The average power derating curve normally given on data sheets may be normalized and used for this purpose. At first glance the derating curves of Figure 7 appear to be in error as the 10 ms pulse has a higher derating factor than the 10 ms pulse. However, when the derating factor for a given pulse of Figure 7 is multiplied by the peak power value of Figure 1 for the same pulse, the results follow the expected trend. 5 Publication Order Number: 1.5SMC6.8AT3/D 1.5SMC6.8AT3G Series, SZ1.5SMC6.8AT3G Series TYPICAL PROTECTION CIRCUIT Zin LOAD Vin V V Vin (TRANSIENT) VL OVERSHOOT DUE TO INDUCTIVE EFFECTS Vin (TRANSIENT) VL VL Vin td tD = TIME DELAY DUE TO CAPACITIVE EFFECT t t Figure 5. Figure 6. 1 0.7 DERATING FACTOR 0.5 0.3 0.2 PULSE WIDTH 10 ms 0.1 0.07 0.05 1 ms 0.03 100 ms 0.02 0.01 10 ms 0.1 0.2 0.5 1 2 5 10 D, DUTY CYCLE (%) 20 50 100 Figure 7. Typical Derating Factor for Duty Cycle Specifications subject to change without notice. (c) 2016 Littelfuse, Inc. September 19, 2016 - Rev. 11 6 Publication Order Number: 1.5SMC6.8AT3/D 1.5SMC6.8AT3G Series, SZ1.5SMC6.8AT3G Series PACKAGE DIMENSIONS SMC CASE 403-03 ISSUE E NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. D DIMENSION SHALL BE MEASURED WITHIN DIMENSION P. 4. 403-01 THRU -02 OBSOLETE, NEW STANDARD 403-03. HE E b DIM A A1 b c D E HE L L1 D MIN 1.90 0.05 2.92 0.15 5.59 6.60 7.75 0.76 MILLIMETERS NOM MAX 2.13 2.41 0.10 0.15 3.00 3.07 0.23 0.30 5.84 6.10 6.86 7.11 7.94 8.13 1.02 1.27 0.51 REF MIN 0.075 0.002 0.115 0.006 0.220 0.260 0.305 0.030 INCHES NOM 0.084 0.004 0.118 0.009 0.230 0.270 0.313 0.040 0.020 REF MAX 0.095 0.006 0.121 0.012 0.240 0.280 0.320 0.050 A L L1 c A1 SOLDERING FOOTPRINT 4.343 0.171 3.810 0.150 2.794 0.110 SCALE 4:1 mm inches Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. Littelfuse.com Specifications subject to change without notice. (c) 2016 Littelfuse, Inc. September 19, 2016 - Rev. 11 7 Publication Order Number: 1.5SMC6.8AT3/D