PROTECTION PRODUCTS
Description
RailClamps are surge rated diode arrays designed to
protect high speed data interfaces. The SRDA70-4 has
been specifically designed to protect sensitive compo-
nents which are connected to data and transmission
lines from over-voltages caused by
ESD
(electrostatic
discharge),
EFT
(electrical fast transients), and
light-
ning.
The unique design of the SRDA70-4 integrates eight
surge rated, low capacitance steering diodes in a low
profile SO-8 package. During transient conditions, the
steering diodes direct the transient to either the
positive side of the power supply line or to ground. The
SRDA70-4 may be used as a stand alone device or in
conjunction with TVS diodes for enhanced protection.
The low capacitance array configuration allows the user
to protect four high speed data or I/O lines. The low
inductance construction minimizes voltage overshoot
during high current surges.
RailClamp
脪
Low Capacitance TVS Diode Array
Features
u
Transient protection for high speed 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) 1kV, 24A (8/20碌s)
Array of surge rated diodes
Protects four I/O lines
Low capacitance for high-speed interfaces
High surge capability
Low forward voltage characteristics
Solid-state silicon avalanche technology
SRDA70-4
u
u
u
u
u
u
u
u
u
u
u
u
u
u
u
u
u
u
Mechanical Characteristics
JEDEC SO-8 package
UL 497B listed
Molding compound flammability rating: UL 94V-0
Marking : Part number, date code, logo
Packaging : Tube or Tape and Reel per EIA 481
Applications
Latch-Up Protection
Microcontroller Input Protection
Token Ring
I
2
C Bus Protection
Video Line Protection
Set Top Box I/O
LAN/WAN Equipment
Circuit Diagram
Schematic & PIN Configuration
REF 1
I/O 1
REF 1
I/O 1
I/O 2
I/O 3
I/O 4
REF 2
I/O 4
I/O 3
REF 2
REF 1
I/O 2
REF 2
SO-8 (Top View)
Revision 9/2000
1
www.semtech.com
1
2
3
4
5
6
