SM2T series ® Transient Voltage Suppressor: TRANSIL ™ FEATURES AND BENEFITS ■ ■ ■ ■ ■ ■ High Peak pulse power: 200 W (10/1000 µs ) 1000 W ( 8/20 µs) Stand-off voltage range 5 to 24V Unidirectional types Low clamping factor VCL/VBR Fast response time 1.0mm overall component height A DESCRIPTION K The SM2T series are Transil diodes designed specifically for portable equipment and miniaturized electronics devices subject to ESD transient overvoltages. Fully compatible with pick and place equipment and inspectable soldering joints. DO-216AA (ST mite) ABSOLUTE RATINGS (Tamb = 25°C) Symbol Parameter Value Unit Peak pulse power dissipation (see note 1) Tj initial = Tamb 200 W Power dissipation on infinitive heatsink Tamb = 100°C 2.5 W IFSM Non repetitive surge peak forward current tp = 10 ms Tj initial = Tamb 25 A Tstg Tj Storage temperature range Maximum operating junction temperature - 65 to + 175 150 °C TL Lead solder temperature (10 seconds duration) 260 °C Value Unit PPP P Note 1: 10/1000 µs pulse waveform. THERMAL RESISTANCES Symbol Parameter Rth (j-t) Junction to tab 20 °C/W Rth (j-a) Junction to ambient on PCB with recommended pad layout 250 °C/W April 2002 - Ed: 1A 1/5 SM2T series ELECTRICAL CHARACTERISTICS (Tamb = 25°C) Symbol I IF Parameter VRM Stand-off voltage VBR Breakdown voltage VCL Clamping voltage IRM Leakage current @ VRM IPP Peak pulse current αT Voltage temperature coefficient VCL VBR V RM VF V I RM I PP Types IRM max @ VRM VCL max @ IPP Note 1 VBR min @ IR T max 10-4/°C C typ at 0V SM2T6V8A 50µA 5V 6.4V 10 mA 9.2V 19.6A 5.7 1600pF SM2T14A 1µA 12V 13.3V 1 mA 19.9V 9.0A 8.3 650pF SM2T18A 1µA 16V 17.1V 1 mA 26V 7A 8.8 500pF SM2T27A 1µA 24V 25.7V 1 mA 38.9V 4.6A 9.6 350pF Note 1: 10/1000µs pulse waveform. Fig. 1: Peak pulse power versus exponential pulse duration. Fig. 2: Relative variation of peak pulse power versus initial junction temperature. % PPP(W) 110 1.E+04 Tj initial = 25°C 100 90 80 1.E+03 70 60 50 40 1.E+02 30 20 10 tP(ms) 0.01 2/5 Tj(°C) 0 1.E+01 0.10 1.00 10.00 0 25 50 75 100 125 150 175 SM2T series Fig. 3: Average power dissipation versus ambient temperature. Fig. 4: Variation of thermal impedance junction to ambient versus pulse duration. Zth(j-a)(°C/W) P(W) 1000.0 3.0 S=0.135cm² Tamb = Ttab 2.5 100.0 2.0 S=2cm² 10.0 1.5 1.0 1.0 Printed circuit board FR4, recommended pad layout 0.5 tP(s) Tamb(°C) 0.1 0.0 0 25 50 75 100 125 150 Fig. 5: Thermal resistance junction to ambient versus copper surface under tab. 1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03 Fig. 6: Reverse leakage current versus junction temperature (typical values). Rth(j-a)(°C/W) IR(nA) 250 1.E+02 VR=VRM 200 1.E+01 150 1.E+00 100 1.E-01 50 S(cm²) Tj(°C) 1.E-02 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 2.2 Fig. 7: Clamping voltage versus peak pulse current (maximum values). 25 50 75 100 125 150 Fig. 8: Junction capacitance versus reverse voltage applied (typical values). IPP(A) C(pF) 100.0 10000 F=1MHz Vosc=30mVRMS Tj=25°C Tj initial =25°C 8/20µs 10/1000µs 10.0 1000 SM2T6V8A SM2T14A SM2T6V8A SM2T18A 1.0 100 SM2T14A SM2T27A SM2T18A SM2T27A VCL(V) VR(V) 0.1 10 0 5 10 15 20 25 30 35 40 45 1 10 100 3/5 SM2T series Fig. 9: Forward voltage drop versus forward current (typical values). IFM(A) 1.E+02 1.E+01 Tj=150°C 1.E+00 Tj=25°C 1.E-01 VFM(V) 1.E-02 0.0 0.5 1.0 1.5 2.0 2.5 3.0 PACKAGE MECHANICAL DATA DO216-AA (ST mite) DIMENSIONS REF. A L3 D Millimeters Min. Typ. Max. Min. Typ. Max. 0.85 1.00 1.15 0.033 0.039 0.045 A1 b2 b Inches 0.10 0.004 b 0.40 0.65 0.016 0.025 b2 0.70 1.00 0.027 0.039 c 0.10 0.25 0.004 0.010 D 1.75 1.90 2.05 0.069 0.007 0.081 E 1.75 1.90 2.05 0.069 0.007 0.081 H 3.60 3.75 3.90 0.142 0.148 0.154 L 0.50 0.63 0.80 0.047 0.025 0.031 L2 1.20 1.35 1.50 0.047 0.053 0.059 H L2 L E R C A A1 0° to 6° R1 L3 Note: The anode is connected to the longer tab The cathode is connected to the shorter tab (heatsink) RECOMMENDED LAYOUT 2.67 0.762 2.54 1.27 0.635 4/5 0.50 ref 0.019 ref R 0.07 0.003 R1 0.07 0.003 SM2T series OTHER INFORMATION Ordering type Marking Package Weight Base qty Delivery mode SM2T6V8A MUA ST mite 15.5 mg 12000 Tape & reel SM2T14A MUE ST mite 15.5 mg 12000 Tape & reel SM2T18A MUG ST mite 15.5 mg 12000 Tape & reel SM2T27A MUJ ST mite 15.5 mg 12000 Tape & reel Information furnished is believed to be accurate and reliable. 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