sm712 Semtech Corporation, sm712 Datasheet

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sm712

Manufacturer Part Number
sm712
Description
Asymmetrical Tvs Diode For Extended Common-mode Rs-485
Manufacturer
Semtech Corporation
Datasheet

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The SM712 transient voltage suppressor (TVS) diode is
designed for asymmetrical (12V to -7V ) protection in
multi-point data transmission standard RS-485 applica-
tions. 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 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 the SM712 minimizes the
stress on the protected transceiver. The SOT23
package allows flexibility in the design of “crowded”
circuit boards.
Revision 11/17/04
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Description
Circuit Diagram
1
Features
Mechanical Characteristics
Applications
Schematic & PIN Configuration
Extended Common-Mode RS-485
400 watts peak pulse power (t
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 clamping voltage
Solid-state silicon avalanche technology
JEDEC SOT23 package
Molding compound flammability rating: UL 94V-0
Marking : 712
Packaging : Tape and Reel per EIA 481
Protection of RS-485 transceivers with extended
common-mode range
Security systems
Automatic Teller Machines
HFC systems
Networks
Asymmetrical TVS Diode for
SOT23 (Top View)
p
= 8/20µs)
www.semtech.com
SM712

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sm712 Summary of contents

Page 1

... TVS diodes in a single package. 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 SOT23 package allows flexibility in the design of “crowded” ...

Page 2

... µ SM712 ...

Page 3

... R 3 SM712 Power Derating Curve 100 125 150 o Ambient Temperature - Pin and Pin and 3 to Waveform Parameters 8µ 20µ ...

Page 4

... EIA RS-485 specifies a ±7V ground difference between devices on the bus. This permits the bus voltage to range from +12V (5V + 7V 7V). The SM712 is designed to protect two RS-485 data lines in extended common mode applications. The SM712 may be used to protect devices from transient voltages resulting from ESD, EFT, and lightning ...

Page 5

... Semtech Corp. H GAUGE PLANE SEATING E PLANE 0.25 C DETAIL aaa C 3X SIDE VIEW SEATING PLANE C -H- X DIM SM712 DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM - A .035 .044 0. .000 .004 0.01 A2 .035 .037 .040 0.88 0. .012 .020 0.30 c ...

Page 6

... Contact Information Phone: (805)498-2111 FAX (805)498-3804 2004 Semtech Corp Semtech Corporation Protection Products Division 200 Flynn Road, Camarillo, CA 93012 6 SM712 www.semtech.com ...

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