SM712

400 watts peak pulse power (tp = 8/20µs)
Transient protection for asymmetrical data lines toEC 61000-4-2 (ESD) 15kV (air), 8kV (contact)IEC 61000-4-4 (EFT) 40A (t5/50ns)IEC 61000-4-5 (Lightning) 12A (8/20µs)
Protects two +12V to -7V lines
Low capacitance
Low clamping voltage
Solid-state silicon avalanche technology

The SM712 transient voltage suppressor (TVS) diode isdesigned for asymmetrical (12V to -7V ) protection inmulti-point data transmission standard RS-485 applica-tions.  The SM712 may be used to protect devicesfrom transient voltages resulting from electrostaticdischarge  (ESD), electrical fast transients (EFT), andlightning.

The SM712 features 400 Watts (tp = 8/20µs) ofpower handling capability to accommodate the highertransient voltage levels which may be expected inextended common mode applications.  This provideshigher equipment reliability and eliminates the "guesswork" required when using zener diodes that are notrated to handle such transient conditions.

The SM712 replaces four discrete components byintegrating two 12V and two 7V TVS diodes in a singlepackage.  The integrated design aids in reducingvoltage over-shoot associated with trace inductance.

The low clamping voltage of the SM712 minimizes thestress on the protected transceiver.  The SOT23package allows flexibility in the design of "crowded"ircuit boards.