R
o
H
S
Telecom Design Guide • © 2006 Littelfuse 3 - 57 www.littelfuse.com
SIDACtor Devices
LCAS Asymmetrical Multiport Device
This is an integrated multichip asymmetrical solution for protecting multiple twisted pair
from overvoltage conditions. Based on a six-pin surface mount SOIC package, it is
equivalent to four discrete DO-214AA or two TO-220 packages. Available in surge
current ratings up to 500 A, the multiport line protector is ideal for densely populated
line cards that cannot afford PCB inefficiencies or the use of series power resistors.
For a diagram of an LCAS (Line Circuit Access Switch) application, see the following
illustrations in Section 6, “Reference Designs” of this Teleco m Design Guide:
Figure 6.31, Figure 6.34 through Figure 6.36, Figure 6.41, Figure 6.43, and
Figure 6.44.
* “L” in part number indicates RoHS compliance. For non-RoHS compliant device, delete “L” from part number.
For individual “UA”, “UB”, and “UC” surge ratings, see table below.
General Notes:
• All measurements are made at an ambient temperature of 25 °C. I
PP
applies to -40 °C through +85 °C temperature range.
• I
PP
is a repetitive surge rating and is guaranteed for the life of the product.
• Listed SIDACtor
®
devices are bi-directional. All electrical parameters and surge ratings apply to forward and reverse polarities.
• V
DRM
is measured at I
DRM.
• V
S
is measured at 100 V/µs.
• Special voltage (V
S
and V
DRM
) and holding current (I
H
) requirements are available upon request.
* Current waveform in µs
** Voltage waveform in µs
Electrical Parameters
Part
Number *
V
DRM
Volts
V
S
Volts
V
DRM
Volts
V
S
Volts
V
T
Volts
I
DRM
µAmps
I
S
mAmps
I
T
Amps
I
H
mAmpsPins 3-2, 6-5 Pins 1-2, 4-5
A1220U_4L 100 130 180 220 4 5 800 2.2 120
A1225U_4L 100 130 230 290 4 5 800 2.2 120
Surge Ratings in Amps
Series
I
PP
I
TSM
50 / 60 Hz di/dt
0.2x310 *
0.5x700 **
2x10 *
2x10 **
8x20 *
1.2x50 **
10x160 *
10x160 **
10x560 *
10x560 **
5x320 *
9x720 **
10x360 *
10x360 **
10x1000 *
10x1000 **
5x310 *
10x700 **
Amps Amps Amps Amps Amps Amps Amps Amps Amps Amps Amps/µs
A 20 150 150 90 50 75 75 45 75 20 500
B 25 250 250 150 100 100 125 80 100 30 500
C 50 500 400 200 150 200 175 100 200 50 500
1
(R
1
)
2
(G
1
)
3
(T
1
)
6
(T
2
)
4
(R
2
)
5
(G
2
)
