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SIDACtor® Data Book and Design Guide

Off-Hook (SLIC) Protection

Off-hook protection is accomplished by choosing a SIDACtor device that meets the

following criteria to ensure proper coordination between the supply voltage (VREF) and the

maximum voltage rating of the SLIC to be protected.

VDRM > VREF

£ VSLIC Breakdown

This criterion can be accomplished in a variety of different ways. For applications using an

external ring generator and a fixed battery voltage, two P0641S_ SIDACtor devices

(P0721S_, P0901S_, or P1101S_ depending on the value of VREF) are used — one Tip to

Ground, one Ring to Ground. For applications using a ring-generating SLIC such as AMD’s

Am79R79, the B1XX0C_ or B1XX1U_ can be used.

IPP Selection

The IPP of the SIDACtor device must be greater than or equal to the maximum available

surge current (IPK(available)) of the applicable regulatory requirements. Calculate the maximum

available surge current by dividing the peak surge voltage supplied by the voltage generator

(VPK) by the total circuit resistance (RTOTAL). The total circuit resistance is determined by

adding the source resistance (RS) of the surge generator to the series resistance in front of

the SIDACtor device on Tip and Ring (RTIP and RRING).

IPP

³ IPK(available)

IPK(available) = VPK / RTOTAL

For metallic surges:

RTOTAL = RS + RTIP + RRING

For longitudinal surges:

RTOTAL = RS + RTIP

RTOTAL = RS + RRING

Reference Diagrams

Figure 3.21 shows the use of Teccor’s “SC” rated SIDACtor devices and the F1250T

TeleLink fuse to meet the surge immunity requirements of GR 1089. Teccor’s P1200SC and

P2000SC, specifically designed to protect Agere Systems (formerly Lucent

Microelectronics) Line Card Access Switch (LCAS), provide on-hook protection. Two

P0641SCs provide off-hook protection. Any additional series resistance is absent because

the “C” series SIDACtor device and F1250T TeleLink fuse are designed to withstand

GR 1089 surges without the aid of additional components such as line feed resistors and

PTCs.

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