LC03-6TE データシートの表示（PDF） - Semtech Corporation

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LC03-6TE

Low Capacitance TVS for High-Speed Data Interfaces

Semtech Corporation 

LC03-6

PROTECTION PRODUCTS

Applications Information

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

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).

Connection for Differential (Line-to-Line) and

Common Mode Protection (Line-to-Ground)

Connection for Differential Protection

(Line-to-Line)

ã 2000 Semtech Corp.

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