DESCRIPTION
The SM712 transient voltage suppressor (T
VS)
diode is designed for asymmetrical 12V t o 7V
protection in multi point data transmission standard
RS 485 applications. The SM712 may be used to
protect devices from transient voltages res u lting
from electrostatic discharge (ESD), electrical fast
transients (FET), and light ning. The SM712 features
400 Watts (t p =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 transc eiver.
The
SM712 is avai lable in SOT 23 p ackage

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 c apacitan ce
⚫ Low leakage current
⚫ Low clamping voltage
⚫ Solid state silicon avalanche technology
⚫ High temperature soldering guaranted:260 ℃℃/10s
⚫ Availabl e in SOT 23 p ackage

APPLICATION S
⚫ Protection of RS 485 transc eivers with extended
⚫ Security systems
⚫ Automatic Tell e r Machines ATMs
⚫ Lighting Control DALI
⚫ Communication Equipments
⚫ Fieldbus
⚫ Modbus
⚫ Profibus
⚫ DMX512
⚫ HFC systems