SM712
DESCRIPTION
FEATURES
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 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.
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 (EFT) 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
ORDERING INFORMATION
APPLICATIONS
Device: SM712
Package: SOT-23
Marking: 712 or C72
Material: Halogen free
Packing: Tape & Reel
Quantity per reel: 3,000pcs
Protection of RS-485 transceivers with
extended common-mode range
Security systems
Automatic Teller Machines
HFC systems
Networks
PIN CONFIGURATION & SCHEMATIC
CIRCUIT DIAGRAM
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MACHANICAL DATA
SOT-23 package
Flammability Rating: UL 94V-0
Terminal: Matte tin plated.
Packaging: Tape and Reel
High temperature soldering guaranteed:
260℃/10s
Reel size: 7 inch
1
SM712
ABSOLUTE MAXIMUM RATING
Symbol
Parameter
Value
Units
PPP
Peak Pulse Power (8/20μs)
400
W
IPP
Peak Pulse Current (8/20μs)
17
A
VESD
ESD per IEC 61000-4-2 (Air)
ESD per IEC 61000-4-2 (Contact)
±15
±8
kV
TOPT
Operating Temperature
-55/+150
C
TSTG
Storage Temperature
-55/+150
C
ELECTRICAL CHARACTERISTICS (Tamb=25C)
Symbol
Parameter
Pin 1 to 3 and
Pin 2 to 3
(12V) TVS
Test Condition
Min
IR
Reverse Working
Voltage
Reverse
Breakdown Voltage
Reverse Leakage
Current
VC1
VC2
VRWM
VBR
CJ1
CJ2
Typ
Pin 3 to 1 or
Pin 2 to 1
IT = 1mA
Max
Pin 3 to 1 and
Pin 3 to 2
(7V TVS)
Min
Typ
12
13.3
Units
Max
7
7.5
V
V
VR = VRWM
1
20
μA
Clamping Voltage 1
IPP = 5A,
tp = 8/20μs
20
12
V
Clamping Voltage 2
IPP = 17A,
tp = 8/20μs
26
16
V
Junction
Capacitance 1
Junction
Capacitance 2
VR = 0V,
f = 1MHz
VR = VRWM,
f = 1MHz
75
75
pF
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45
2
45
pF
SM712
ELECTRICAL CHARACTERISTICS CURVE
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3
SM712
SOT-23 PACKAGE OUTLINE DIMENSIONS
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4
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