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PROTECTION PRODUCTS
PROTECTION PRODUCTS
LC04-6
Dual Low Capacitance TVS Array for
Telecom Linecard Applications
Description
The LC04-6 has been specifically designed to protect
sensitive components which are connected to highspeed telecommunications lines from over voltages
caused by lightning, ESD (electrostatic discharge), and
EFT (electrical fast transients).
The device is in a JEDEC SO-16 NB package. It is
designed to provide metallic surge protection for two
tip & ring line pairs. The low capacitance topology
means signal integrity is preserved on high-speed lines.
The high surge capability (1000W, tp=10/1000µs)
makes the LC04-6 suitable for telecommunications
systems operating in harsh transient environments.
The LC04-6 is designed to meet the lightning surge
requirements of Bellcore GR-1089 (Intra-building) , FCC
Part 68, ITU K.20, and IEC 61000-4-5. The features of
the LC04-6 are ideal for protecting T1/E1 transceivers
in WAN applications.
Features
u Transient protection for high-speed data lines to
Bellcore GR-1089 I
Bellcore GR 1089 IPP=100A (2/10µs)
ITU K.20 IPP=100A (5/310µs)
IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact)
IEC 61000-4-5 (Lightning) I
=70A (10/1000µs)
PP
=100A (8/20µs)
PP
u Protects two tip and ring line pairs
u Low capacitance for high-speed interfaces
u High surge capability
u Low clamping voltage
u Solid-state silicon avalanche technology
Mechanical Characteristics
u JEDEC SO-16 package
u Molding compound flammability rating: UL 94V-0
u Marking : Part number, date code, logo
u Packaging : Tube or Tape and Reel per EIA 481
Applications
u T1/E1 Line Cards
u Base Stations
u WAN Equipment
u CSU/DSU
u Multiplexers
u Routers
u ISP Equipment
u Customer Premise Equipment
Circuit Diagram Schematic & PIN Configuration
TIP
RING
Revision 9/2000
SO-16 (Top View)
1
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PROTECTION PRODUCTS
Absolute Maximum Rating
LC04-06
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2ã 2000 Semtech Corp.
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PROTECTION PRODUCTS
µ
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve
LC04-06
100
(kW)
PP
10
Peak Pulse Power - P
1
0.1 1 10 100 1000
Pulse Duration - tp (µs)
110
100
90
80
70
PP
60
50
40
Percent of I
30
20
10
0
0 5 10 15 20 25 30
-t
e
Time (µs)
td = IPP/2
Waveform
Parameters:
tr = 8µs
td = 20µs
110
100
90
PP
80
70
60
50
40
30
% of Rated Power or I
20
10
0
0 25 50 75 100 125 150
Ambien t Temperature - T
A
(oC)
Clamping Voltage vs. Peak Pulse CurrentPulse Waveform
14
12
(V)
C
10
8
6
4
Clamping Voltage - V
2
0
0 1020304050607080
Peak Pul s e Current - I
PP
Waveform
Parameters:
tr = 10µs
td = 1000
(A)
s
Capacitance vs. Reverse Voltage
(Each Line)
14
12
10
8
6
Capacitance (pF)
4
2
0
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Reverse Voltage (V)
ã 2000 Semtech Corp.
f=1MHz
3
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PROTECTION PRODUCTS
Applications Information
LC04-06
Device Connection Options for Protection of Two
High-Speed Line Pairs
The LC04-6 is designed to protect four high-speed data
lines (two differential pairs) from transient over-voltages which result from lightning and ESD. Protection
of two line pairs is achieved by connecting the device
as follows: Pins 1-4 are connected to line 1 of the first
pair (i.e. Tip 1) and pins 13-16 are connected to line 2
of the first pair (i.e. Ring 1). Pins 5-8 are connected to
line 1 of the second pair (i.e. Tip 2) and pins 9-12 are
connected to line two of the second pair (i.e. Ring 2).
All pins should be connected for best results. Minimize
parasitic inductance in the protection circuit path by
keeping the trace length between the protected line
and the LC04-6 as short as possible.
T1/E1 Linecard Protection
A typical T1/E1 linecard protection circuit is shown in
Figure 2. The LC04-6 is connected between Tip & Ring
on the transmit and receive line pairs. It provides
protection to metallic (line-to-line) lightning and ESD
surges. It is designed to meet the intra-building requirements of Bellcore GR-1089. This design takes
advantage of the isolation of the transformer to
suppress common mode surges. The LC04-6 may also
be configured to meet metallic surges of FCC Part68
when used in conjunction with a 5W (minimum) PTC or
line feed resistor (LFR). The PTC (or LFR + fuse) are
required to meet the AC power cross requirements, but
will also reduce the effective surge current to levels
within the capability of the LC04-6 (Table 1). To complete the protection circuit, the SRDA05-4 (or
SRDA3.3-4 for 3.3V supplies) is employed as the IC
side protection element. This device helps prevent the
transceiver from latching up by providing fine clamping
of transients that are coupled through the transformer.
The versatility of the LC04-6 makes it ideal for use with
combination long haul/short haul T1/E1 transceivers.
Figure 1 - Connection for Differential (Line-to-Line)
Protection of two Tip/Ring Line Pairs
TIP 1
TIP 2
RING 1
RING 2
4ã 2000 Semtech Corp.
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PROTECTION PRODUCTS
Typical Applications
LC04-06
Figure 2 - T1 Line Card protection
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ã 2000 Semtech Corp.
5
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PROTECTION PRODUCTS
Outline Drawing - SO-16
LC04-06
Land Pattern - SO-16
6ã 2000 Semtech Corp.
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PROTECTION PRODUCTS
Ordering Information
LC04-06
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Note:
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Contact Information
ã 2000 Semtech Corp.
Semtech Corporation
Protection Products Division
652 Mitchell Rd., Newbury Park, CA 91320
Phone: (805)498-2111 FAX (805)498-3804
7
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