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SIDACtor Device Selection Criteria

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SIDACtor® Data Book and Design Guide

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SIDACtor Device Selection Criteria

When selecting a SIDACtor device, the following criteria should be used:

Off-state Voltage (VDRM)

The VDRM of the SIDACtor device must be greater than the maximum operating voltage of

the circuit that the SIDACtor device is protecting.

Example 1:

For a POTS (Plain Old Telephone Service) application, convert the maximum operating

Ring voltage (150 V rms) to a peak voltage, and add the maximum DC bias of the central

office battery:

150 VRMS

Ö2 + 56.6 VPK = 268.8 VPK

\ VDRM > 268.8 V

Example 2:

For an ISDN application, add the maximum voltage of the DC power supply to the

maximum voltage of the transmission signal (for U.S. applications, the U-interface will not

have a DC voltage, but European ISDN applications may):

150 VPK + 3 VPK = 153 VPK

\ VDRM > 153 V

Switching Voltage (VS)

The VS of the SIDACtor device should be equal to or less than the instantaneous peak

voltage rating of the component it is protecting.

Example 1:

£ VRelay Breakdown

Example 2:

£ SLIC VPK

Peak Pulse Current (IPP)

For circuits that do not require additional series resistance, the surge current rating (IPP) of

the SIDACtor device should be greater than or equal to the surge currents associated with

the lightning immunity tests of the applicable regulatory requirement (IPK):

IPP

³ IPK

For circuits that use additional series resistance, the surge current rating (IPP) of the

SIDACtor device should be greater than or equal to the available surge currents associated

with the lightning immunity tests of the applicable regulatory requirement (IPK(available)):

IPP

³ IPK(available)

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