PROTECTION PRODUCTS
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PROTECTION PRODUCTS
LC04-6
Dual Low Capacitance TVS Array for
Telecom Linecard Applications
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Transient protection for high-speed data lines to
Bellcore GR-1089 I
PP
=70A (10/1000s)
Bellcore GR 1089 I
PP
=100A (2/10s)
ITU K.20 I
PP
=100A (5/310s)
IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact)
IEC 61000-4-5 (Lightning) I
PP
=100A (8/20s)
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Protects two tip and ring line pairs
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Low capacitance for high-speed interfaces
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High surge capability
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Low clamping voltage
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Solid-state silicon avalanche technology
Description
Features
Circuit Diagram
Schematic & PIN Configuration
Revision 9/2000
Applications
Mechanical Characteristics
The LC04-6 has been specifically designed to protect
sensitive components which are connected to high-
speed 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=10/1000s)
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.
SO-16 (Top View)
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JEDEC SO-16 package
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Molding compound flammability rating: UL 94V-0
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Marking : Part number, date code, logo
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Packaging : Tube or Tape and Reel per EIA 481
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T1/E1 Line Cards
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Base Stations
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WAN Equipment
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CSU/DSU
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Multiplexers
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Routers
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ISP Equipment
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Customer Premise Equipment
TIP
RING
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2000 Semtech Corp.
www.semtech.com
PROTECTION PRODUCTS
LC04-06
Figure 1 - Connection for Differential (Line-to-Line)
Protection of two Tip/Ring Line Pairs
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-volt-
ages 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 re-
quirements 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 com-
plete 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.
TIP 1
TIP 2
RING 1
RING 2
Applications Information
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