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LC03-6 データシート(PDF) 4 Page - Semtech Corporation

部品番号 LC03-6
部品情報  Low Capacitance Surface Mount TVS for High-Speed Data Interfaces
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メーカー  SEMTECH [Semtech Corporation]
ホームページ  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

LC03-6 データシート(HTML) 4 Page - Semtech Corporation

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ã 2000 Semtech Corp.
www.semtech.com
PROTECTION PRODUCTS
LC03-6
Device Connection Options for Protection of Two
High-Speed Data Lines
The LC03-6 is designed to protect two high-speed data
lines (one differential pair) from transient over-voltages
which result from lightning and ESD. The device can be
configured to protect in differential (Line-to-Line) and
common (Line-to-Ground) mode. Data line inputs/
outputs are connected at pins 1 to 8, and 4 to 5 as
shown. Pins 2, 3, 6, and 7 are connected to ground.
These pins should be connected directly to a ground
plane on the board for best results. The path length is
kept as short as possible to minimize parasitic induc-
tance. In applications where high common mode
voltages are present, differential protection is achieved
by leaving pins 2, 3, 6, and 7 not connected.
T1/E1 Linecard Protection (Intra-Building)
A typical T1/E1 linecard protection circuit is shown
below. The LC03-6 is connected between Tip & Ring
on the transmit and receive line pairs. It provides
protection to metallic and common mode lightning
surges per Bellcore 1089. This design takes advan-
tage of the isolation of the transformer to suppress
common mode surges. 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. For further informa-
tion, reference Semtech application note AN97-10
Connection for Differential (Line-to-Line) and
Common Mode Protection (Line-to-Ground)
Connection for Differential Protection
(Line-to-Line)
Applications Information
T3/E3 & STS-1 Protection
The LC03-6 can also be used to protect T3/E3 and
STS-1 interfaces. The data lines from the BNC inter-
face are run through the LC03-6 (i.e. enters at pin 1
and exits at pin 8) with the ground connection made at
the other side of the device (pins 4 & 5). The center
pins (2, 3, 6, and 7) are not connected. In this configu-
ration, the LC03-6 adds less than 12pF of capacitance
to each line and provides surge protection to 100A
(tp=8/20ms).


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