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 (tp=8/20μs)
• Transient protection for asymmetrical data lines to
   IEC 61000-4-2 (ESD) ±15kV(air), ±8kV(contact)
   IEC 61000-4-4 (FET) 40A (5/50ns)
   IEC 61000-4-5 (Lightning) 12A (8/20μs)
• Protects two +12V to -7V lines
• Low capacitance
• Low leakage current
• Low clamping voltage
• Solid-state silicon avalanche technology
• RoHS compliant

APPLICATIONS
• Protection of RS-485 transceivers with extended common-mode range
• Security systems
• Automatic Teller Machines
• HFC systems
• Networks