Sidactor Protection Thyristor Products Page 83 SIDACtor Protection Thyristor Products

SIDACtor Protection Thyristors 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/23/17 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 (3)SDP-018 Ring Tip Ring Tip DSL driver chipset SDP-018

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