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