Littelfuse SDP Series SOT23-5 - Manual (Page 4)

SIDACtor ® Protection Thyristors
4
Revised: August 6, 2013
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for current information.
Teccor ® brand SIDACtor ® DSL Protection Devices
SDP-xxx Application example
The following schematics show alternate protection solutions
for a typical DSL interface that connects to outside wiring.
This surface mount SOT23-5 chip-side solution provides a
minimum footprint solution appropriate for high density card
designs. The SDP-xxx0T023 will protect the interface from
lightning induced surges on the chip-side of the coupling
transformer. This tertiary protector may be preceded by line-
side protection such as the TeleLink over-current protector and the SDP3500Q38CB overvoltage protector. GDTs may
also be used on the line side of the coupling transformer. The
flow-through design of the SOT23-5 package is illustrated
below. If the inter winding capacitance of the transformer is
allowing some common mode events to get coupled across,
then the SDP-xxx0T023 can be placed in a three chip mode,
as shown below for additional chip-side protection.
NC
PCBTrace
PCBTrace
(3)SDP-018
Ring
Tip
Ring
Tip
DSL driver chipset
DSL driver chipset
SDP-018