SM712

SM712 Asymmetrical TVS Diode for Extended Common-Mode RS-485 SOT-23 Plastic-Encapsulate ESD Protection Diodes DESCRIPTION The SM712 transient voltage suppressor (TVS) diode is designed for asymmetrical (12V to -7V) protection in multi-point data transmission standard RS-485 applications. The SM712 may be used to protect devices from transient voltages resulting from electrostatic discharge (ESD), electrical fast transients (FET), and lightning. The SM712 features 400 Watts (tp=8/20μs) of power handling capability to accommodate the higher transient voltage levels which may be expected in extended common mode applications. This provides higher equipment reliability and eliminates the “ guess work” required when using zener diodes that are not rated to handle such transient conditions. The integrated design aids in reducing voltage over-shoot associated with trace inductance. The low clamping voltage of the SM712 minimizes the stress on the protected transceiver. The SOT-23 package allows flexibility in the design of “crowed” circuit boards. Features  400 Watts Peak Pulse Power per (8/20μs)  Transient protection for asymmetrical data lines to IEC61000-4-2 (ESD) ±15kV (air), ±8kV (contact) IEC61000-4-4 (EFT) 40A (5/50ns) IEC61000-4-5 (Lightning) 12A (8/20μs)  Protects two +12V to -7V lines  Low capacitance  Low leakage current  Low clamping voltage  Solid-state silicon avalanche technology  Meets MSL 1 Requirements Schematic & Pin Configuration 3 1 2 SOT23 (Top View) Circuit Diagram I/O 1 I/O 2 1 2 12V 12V 7V 7V SM712 GND Applications       Protection of RS-485 transceivers with extended common-mode range Security systems Automatic Teller Machines HFC systems Networks http://www.microdiode.com 3 Mechanical Characteristics Package: SOT-23 Flammability Rating: UL 94V-0 Terminal: Matte tin plated. High temperature soldering guaranted: 260℃/10s  Marking: 712 or C72  Packaging: Tape and Reel     Rev:2024A2 Page :1 SM712 Asymmetrical TVS Diode for Extended Common-Mode RS-485 Absolute Maximum Ratings (TA=25°C unless otherwise specified) Parameter Symbol Value Unit Peak Pulse Power(8/20us ) PPP 400 W Peak Pulse Current(8/20us) IPP 17 A VESD ± 15 ±8 KV Operating Temperature TOPT −55 to +150 °C Storage Temperature TSTG −55 to +150 °C TL 260(10 sec.) °C ESD per IEC 61000−4−2 (Air) ESD per IEC 61000−4−2 (Contact) Lead Solder Temperature – Maximum (10 Second Duration) Electrical Characteristics (TA=25°C unless otherwise specified) mbol Symbol Parame Test Condition Pin 1 to 3 and Pin 2 to 3 (12V) TVS Min VRWM VBR IR Reverse Working Voltage Reverse Breakdown Voltage Reverse Leakage Current Typ Pin 3 to 1 or Pin 2 to 1 IT = 1mA Pin 3 to 1 and Pin 3 to 2 (7V TVS) Max Min i Typ 12 13.3 Units Max 7 7.5 V V VR = VRWM 1 20 μA VC1 Clamping Voltage 1 IPP = 5A, tp = 8/20μs 20 12 V VC2 Clamping Voltage 2 IPP = 17A, tp = 8/20μs 26 16 V Junction Capacitance 1 Junction Capacitance 2 VR = 0V, f = 1MHz VR = VRWM, f = 1MHz 75 75 pF CJ1 CJ2 45 45 pF The above data are for reference only. http://www.microdiode.com Rev:2024A2 Page :2 SM712 Asymmetrical TVS Diode for Extended Common-Mode RS-485 ELECTRICAL CHARACTERISTICS CURVE The curve above is for reference only. http://www.microdiode.com Rev:2024A2 Page :3 SM712 Asymmetrical TVS Diode for Extended Common-Mode RS-485 Outlitne Drawing SOT-23 Package Outline Dimensions e Suggested Pad Layout 0.037 0.95 0.037 0.95 L L1 E E1 Symbol A A1 b c D E E1 e L L1 θ Dimensions In Millimeters Min Typ Max 1.40 0.89 1.00 0.10 0.06 0.01 0.50 0.37 0.44 0.20 0.09 0.13 2.80 2.90 3.10 1.60 1.20 1.30 2.40 2.10 2.80 1.78 2.04 1.90 0.10 0.30 0.69 0.35 0.54 0° 10° Note: 1. Controlling dimension:in/millimeters. 2. General tolerance: ±0.05mm. 3. The pad layout is for reference purposes only. 0.079 2.0 0.035 0.9 0.031 0.8 http://www.microdiode.com inches mm Rev:2024A2 Page :4 SM712 Asymmetrical TVS Diode for Extended Common-Mode RS-485 SOT-23 Tape and Reel Packaging Description: SOT-23 parts are shipped in tape. The carrier tape is made from a dissipative (carbon filled) polycarbonate resin. The cover tape is a multilayer film (Heat Activated Adhesive in nature) primarily composed of polyester film,adhesive laye,sealant, and anti-static sprayed agent.These reeled parts In standard option are shipped with 3,000 units per 7" or 17.8cm diameter reel. The reels are clear in color and is made of polystyrene plastic (anti-static coated). 3000 pcs http://www.microdiode.com 7 Inch 45,000 pcs 203×203×195 180,000 pcs 438×438×220 Rev:2024A2 Page :5