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LCDA12C-1 and LCDA15C-1
PROTECTION PRODUCTS
Applications Information
Device Connection for Metallic Protection of High-
Speed Data Lines
Line
In
1
4
Line
Out
The LCDAxxC-1 is designed to protect high-speed data
lines from transient over-voltages which result from
lightning and ESD. The device is designed to protect
one line in common mode (Line-to-Ground) or one line
Line
In
2
3
Line
Out
pair in metallic (Line-to-Line) mode. For metallic mode
protection, the input of line 1 is connected at pin 1 and
the output is connected at pin 4. Likewise, the input
of line 2 is connected at pin 2 and the output is con-
nected at pin 3. For common mode protection, ground
either pins 1 and 4 or pins 2 and 3. The ground
Figure 1 - Connection for Differential Protection
(Line-to-Line)
connection should be made directly to the ground
plane for best results.
Line
In
1
4
Line
Out
ADSL Protection
A typical ADSL protection circuit is shown in Figure
3. The LCDA12C-1 (or LCDA15C-1 for 15 volt drivers)
is connected from each line to ground on the IC side of
the line. They provide lightning and ESD protection for
2
3
the sensitive line driver IC.
Matte Tin Lead Finish
Matte tin has become the industry standard lead-free
replacement for SnPb lead finishes. A matte tin finish
is composed of 100% tin solder with large grains.
Since the solder volume on the leads is small com-
pared to the solder paste volume that is placed on the
land pattern of the PCB, the reflow profile will be
Figure 2 - Connection for Common Mode
Protection (Line-to-Ground)
determined by the requirements of the solder paste.
Therefore, these devices are compatible with both
lead-free and SnPb assembly techniques. In addition,
unlike other lead-free compositions, matte tin does not
have any added alloys that can cause degradation of
the solder joint.
Figure 3 - ADSL Protection Circuit
? 2005 Semtech Corp.
4
www.semtech.com
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