SM2T ® TRANSIL™ FEATURES ■ 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 ■ ■ A K Fast response time 1.0mm overall component height DESCRIPTION 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. STmite (JEDEC DO-216AA) Table 1: Order Codes Part Number Marking SM2T6V8A MUA SM2T14A MUE SM2T18A MUG SM2T27A MUJ Table 2: Absolute Ratings (Tamb = 25°C) Symbol Parameter 1 Value Unit Peak pulse power dissipation (see note ) Tj initial = Tamb 200 W Power dissipation on infinite 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 junction temperature -65 to 175 150 °C 260 °C Value 20 250 Unit °C/W °C/W PPP P TL Maximum lead temperature for soldering during 10 s. Note 1: 10/1000µs pulse waveform. Table 3: Thermal Resistances Symbol Parameter Rth(j-t) Junction to tab Rth(j-a) Junction to ambient on PCB with recommended pad layout January 2005 REV. 3 1/6 SM2T Table 4: Electrical Characteristics (Tamb = 25°C) Symbol Parameter I IF VRM Stand-off voltage VBR Breakdown voltage VCL Clamping voltage IRM Leakage current @ VRM IPP Peak pulse current αT Voltage temperature coefficient VF Forward voltage drop SM2T6V8A SM2T14A SM2T18A SM2T27A Note 1: 10/1000µs pulse waveform. 2/6 VBR V RM IRM Types VCL VF V I RM I PP @ VRM max VBR @ IR min VCL @ IPP max αT C max typ @ 0V note1 µA V V mA V A 50 1 1 1 5 12 16 24 6.4 13.3 17.1 25.7 10 1 1 1 9.2 19.9 26 28.9 19.6 9 7 4.6 10-4/°C 5.7 8.3 8.8 9.6 pF 1600 650 500 350 SM2T Figure 1: Peak pulse power versus exponential pulse duration Figure 2: Relative variation of peak pulse power versus initial junction temperature PPP(W) % 1.E+04 110 Tj initial = 25°C 100 90 80 1.E+03 70 60 50 40 1.E+02 30 20 10 tp(ms) Tj(°C) 0 1.E+01 0.01 0.10 1.00 10.00 Figure 3: Average power dissipation versus ambient temperature 0 25 50 75 100 125 150 175 Figure 4: Variation of thermal impedance junction to ambient versus pulse duration Zth(j-c)/Rth(j-c) 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 Printed circuit board FR4, recommended pad layout 1.0 0.5 tp(s) TAMB(°C) 0.0 0.1 0 25 50 75 100 125 150 Figure 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 Figure 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 2.2 0 25 50 75 100 125 150 3/6 SM2T Figure 7: Clamping voltage versus peak pulse current (maximum values) Figure 8: Junction capacitance versus reverse voltage applied (typical values) IPP(A) C(pF) 100.0 10000 Tj initial = 25°C F=1MHz VOSC=30mVRMS Tj=25°C 8/20µs 10/1000µs 10.0 1000 SM2T6V8A SM2T14A SM2T6V8A SM2T18A 1.0 100 SM2T14A SM2T27A SM2T18A SM2T27A VR(V) VCL(V) 10 0.1 0 5 10 15 20 25 30 35 40 45 Fig. 9: Forward voltage drop versus forward current (typical values) IFM(A) 1.E+02 1.E+01 Tj = 150°C Tj = 25°C 1.E+00 1.E-01 VFM(V) 1.E-02 0.0 4/6 0.5 1.0 1.5 2.0 2.5 3.0 1 10 100 SM2T Figure 10: STmite Package Mechanical Data REF. A A1 b b2 c D E H L L2 L3 L3 D b2 b H L2 L E R C A A1 0° to 6° R1 R R1 DIMENSIONS Millimeters Inches Min. Typ. Max. Min. Typ. 0.85 1.00 1.15 0.033 0.039 0.10 0.40 0.65 0.016 0.70 1.00 0.027 0.10 0.25 0.004 1.75 1.90 2.05 0.069 0.007 1.75 1.90 2.05 0.069 0.007 3.60 3.75 3.90 0.142 0.148 0.50 0.63 0.80 0.020 0.025 1.20 1.35 1.50 0.047 0.053 0.50 0.019 ref ref 0.07 0.003 0.07 0.003 Max. 0.045 0.004 0.025 0.039 0.010 0.081 0.081 0.154 0.031 0.059 Figure 11: STmite Foot Print Dimensions (in millimeters) 2.67 0.762 2.54 1.27 0.635 Table 5: Ordering Information Part Number Marking SM2T6V8A MUA SM2T14A MUE SM2T18A MUG SM2T27A MUJ Package Weight Base qty Delivery mode STmite 15.5 mg 12000 Tape & reel Table 6: Revision History Date Revision Description of Changes April-2002 1A Aug-2004 2 STmite package dimensions update. 14-Jan-2005 3 Minor layout update. No content change. Last update. 5/6 SM2T Information furnished is believed to be accurate and reliable. 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