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 (EFT), and
lightning.

The SM712 features more than 500 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 “guesswork “ required when using Zener diodes that are not rated to handle such transient conditions.

The SM712 replaces four discrete components by integrating two 12V and two 7V TVS diodes in a single package. The integrated design aids in reducing voltage over-shoot associated with trace inductance. The low clamping voltage of SM712 minimizes the stress on the protected transceiver.