SLVE28 Datasheet, PDF (4/7 Pages) Semtech Corporation – SLVE2.8 & SLVG2.8 EPD TVS DIODES FOR ESD AND LATCH-UP PROTECTION

SLVE2.8 & SLVG2.8
PROTECTION PRODUCTS
Applications Information
Device Connection
Electronic equipment is susceptible to transient distur-
bances from a variety of sources including: ESD to an
open connector or interface, direct or nearby lightning
strikes to cables and wires, and charged cables “hot
plugged” into I/O ports. The SLV series is designed to
protect sensitive components from damage and latch-
up which may result from such transient events. The
SLVG2.8 is designed to protect one unidirectional line
while the SLVE2.8 is designed to protect one bidirec-
tional line (or two differential lines). The options for
connecting the devices are as follows:
" SLVE2.8: Common mode protection of one bidirec-
tional data line is achieved by connecting the data
line input/output at pins 2 and 3. Pins 1 and 4 are
connected to ground. For differential protection,
pins 1 & 4 can be connected to a second I/O line.
For best results, the ground connection should be
made directly to a ground plane on the board. The
path length should be kept as short as possible to
minimize parasitic inductance.
" SLVG2.8: Common mode protection of one unidi-
rectional line is achieved by connecting the line to
be protected at pins 2 & 3. Pins 1 & 4 are con-
nected to ground. For best results, the ground
connection should be made directly to a ground
plane on the board. The path length should be
kept as short as possible to minimize parasitic
inductance.
Circuit Board Layout Recommendations for Suppres-
sion of ESD.
Good circuit board layout is critical for the suppression
of ESD induced transients. The following guidelines are
recommended:
" Place the TVS near the input terminals or connec-
tors to restrict transient coupling.
" Minimize the path length between the TVS and the
protected line.
" Minimize all conductive loops including power and
ground loops.
" The ESD transient return path to ground should be
kept as short as possible.
" Never run critical signals near board edges.
" Use ground planes whenever possible.
Circuit Diagrams
4
4
1
1
2
3
SLVG2.8
2
3
SLVE2.8
Common Mode Protection (SLVE2.8 & SLVG2.8)
4
1
Line ²
In
3
Line
Out
Differential Mode Protection (SLVE2.8 only)
Line 1
In
1
4
Line 1
Out
Line 2 ²
In
3
Line 2
Out
 2001 Semtech Corp.
4
www.semtech.com