P3602ACMC datasheet(168/212 Pages) TECCOR

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SIDACtor Device Selection Criteria

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SIDACtor® Data Book and Design Guide

The maximum available surge current is calculated by dividing the peak surge voltage (VPK)

by the total circuit resistance (RTOTAL):

IPK(available) = VPK/RTOTAL

For longitudinal surges (Tip-Ground, Ring-Ground), RTOTAL is calculated for both Tip and

Ring:

RSOURCE = VPK/IPK

RTOTAL = RTIP + RSOURCE

RTOTAL = RRING + RSOURCE

For metallic surges (Tip-Ring):

RSOURCE = VPK/IPK

RTOTAL = RTIP + RRING + RSOURCE

Example 1:

A modem manufacturer must pass the Type A surge requirement of TIA-968 (formerly

known as FCC Part 68) without any series resistance.

IPK = 100 A, 10x560 µs

IPP

³ 100 A, 10x560 µs

Therefore, either a “B” rated or “C” rated SIDACtor device would be selected.

Example 2:

A line card manufacturer must pass the surge requirements of GR 1089 with 30

W on Tip

and 30

W on Ring.

IPK = 100 A, 10x1000 µs

VPK = 1000 V

RSOURCE = VPK/IPK = 10

RTOTAL = RSOURCE + RTIP = 40

IPK (available) = VPK/RTOTAL = 1000 V/40

\ IPP ³ 25 A

Holding Current (IH)

Because TIA-968 4.4.1.7.3 specifies that registered terminal equipment not exceed

140 mA dc per conductor under short-circuit conditions, the holding current of the SIDACtor

device is set at 150 mA.

For specific design criteria, the holding current (IH) of the SIDACtor device must be greater

than the DC current that can be supplied during an operational and short circuit condition.

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