SM712 Asymmetrical TVS Diode for Extended Common-Mode RS-485 FEATURES SOT-23 ● 400 watts peak pulse power (t p = 8/20µs) ● Transient protection for asymmetrical data lines to ● ● ● ● IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns) IEC 61000-4-5 (Lightning) 12A (8/20µs) Protects two +12V to -7V lines Low capacitance Low clamping voltage Solid-state silicon avalanche technology APPLICATIONS Pin Configuration ● Protection of RS-485 transceivers with extended ● ● ● ● common-mode range Security systems Automatic Teller Machines HFC systems Networks Absolute Maximum Rating (Tamb=25°C unless otherwise specified) Rating Symbol Value Units Peak Pulse Power (tp = 8/20μs) Ppk 400 Watts Peak Pulse Current (tp = 8/20μs) IPP 17 A ESD per IEC 61000-4-2 (Air) ESD per IEC 61000-4-2 (Contact) VESD 15 8 kV Lead Soldering Temperature TL 260 (10 sec.) ℃ Operating Temperature TJ -55 to +125 ℃ TSTG -55 to +150 ℃ Storage Temperature SM712 Asymmetrical TVS Diode for Extended Common-Mode RS-485 ● Electrical Characteristics(Tamb=25 °C ) Pins 1 to 3 and 2 to 3 (12V T VS) Parameter MI N T YP MAX Pins 3 to 1 and 3 to 2 (7V T VS) Symbo l Conditions MI N T YP Reverse Stand-Off Voltage VRWM Pin 3 to 1 or Pin 2 to 1 Reverse Breakdown Voltage V BR IPT = 1mA Reverse Leakage Current IR VR = VRWM 1 20 µA Clamp ing Voltage VC IPP = 5A, tp = 8/20µs 20 10 V Clamp ing Voltage VC IPP = 17A, tp = 8/20µs 26 12 V Junction Cap acitance Cj VR = 0V, f = 1MHz 75 75 pF 12 13.3 VR = VRWM, f = 1MHz MAX Units 7 V 7.5 45 V 45 pF ● Electrical Characteristics Curve Peak Pulse Power VS Pulse Time 10,000 1,000 600W, 8/20µs Waveform PPP 100 10 0.1 1 10 td 100 1,000 10,000 SM712 Asymmetrical TVS Diode for Extended Common-Mode RS-485 ● Electrical Characteristics Curve Capacitance vs. Reverse Voltage Power Derating Curve 110 80 100 % of Rated Power or I PP Capacitance - Cj (pF) 70 60 50 40 30 20 10 f = 1MHz 90 80 70 60 50 40 30 20 10 0 0 0 1 2 3 4 5 6 7 8 9 10 11 12 0 13 25 110 125 150 175 22 Clamping Voltage - V C (V) 90 80 Percent of I PP 100 24 W aveform Parameters: tr = 8µs td = 20µs 100 e -t 60 50 40 75 Clamping Voltage vs. Peak Pulse Current Pulse Waveform 70 50 Ambient Temperature - TA ( oC) Reverse Voltage - V R (V) td = IPP /2 30 20 10 20 18 Pin 1 to 3 and 2 to 3 16 14 12 10 Pin 3 to 1 and 3 to 8 6 Waveform Parameters: tr = 8µs td = 20µs 4 2 0 0 0 5 10 15 T im e (µs) 20 25 30 0 2 4 6 8 10 Peak Pulse Current - IPP (A) 12 14 16 SM712 Asymmetrical TVS Diode for Extended Common-Mode RS-485 SOT-23 PACKAGE OUTLINE DIMENTION 1 e L L1 E E1 θ Symbol A A1 b c D E E1 e L L1 θ Dimensions In Millimeters Min Typ Max 1.00 1.40 0.10 0.35 0.50 0.10 0.20 2.70 2.90 3.10 1.40 1.60 2.40 2.80 1.90 0.10 0.30 0.40 0° 10°