Analog Line Cards
Figure 3.23 illustrates the use of the P2600SA and P0721CA2 for overvoltage protection
and the F0500T for overcurrent protection in addition to 20 ꢂ of series resistance on both
Tip and Ring. The series resistance is required to limit the transient surge currents to within
the surge current rating of the “A” series SIDACtor devices and the F0500T TeleLink fuse.
F0500T
20 Ω
P0721CA2
Tip
P2600SA
R
E
L
A
S
L
I
C
Y
P2600SA
Ring
20 Ω
F0500T
Figure 3.23 SLIC Protection with Fixed Voltage SIDACtor Devices
The illustration of SLIC protection in Figure 3.24 shows Teccor’s Battrax device protecting
Legerity’s (formerly AMD’s) Am79R79 from overvoltages and uses a F1250T to protect
against sustained power cross conditions. The Battrax product was designed specifically to
protect SLICs that cannot withstand potential differences greater than VREF ± 10 V.
-V
REF
0.1 µF
F1250T
Tip
1N4935/
MUR120
B1XX0CC
Legerity
Am79R79
B1XX0CC
1N4935/
MUR120
Ring
F1250T
0.1µF
-V
REF
Figure 3.24 SLIC Protection with Programmable Voltage SIDACtor Devices
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© 2002 Teccor Electronics
SIDACtor Data Book and Design Guide
®
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