LCDA12C-1 & LCDA15C-1
Low Capacitance TVS Diode Array
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Description
The LCDAxxC-1 is a low capacitance transient voltage
suppressor (TVS) diode array. It is designed to protect
sensitive CMOS ICs from the damaging effects of ESD
and lightning. Each device will protect one line in
common (line-to-ground) mode or one line pair in
metallic (Line-to-line) mode. They are low capacitance
(< 15pF) making them suitable for use on high-speed
telecom and datacom interfaces without signal degradation.
The configuration of the LCDAxxC-1 has been optimized
for easy layout on high density boards. The small SOT143 package minimizes required board space. These
devices will handle up to 20 Amps for an 8/20µs
lightning impulse. The low inductance construction
minimizes voltage overshoot during high current
surges.
The LCDAxxC-1 may be used to protect ADSL interfaces, multi-protocol serial transceivers, portable
electronics, and wireless systems.
PRELIMINARY
Features
u ESD protection to IEC 61000-4-2, Level 4
u Lightning protection per IEC 61000-4-5
(20A, tp=8/20µs)
u Configuration optimized for easy board layout
u Protects one line pair
u Low capacitance (<15pF) for high-speed interfaces
u Low clamping voltage
u Low leakage current
u Operating voltage: 12V & 15V
u Solid-state silicon-avalanche technology
Mechanical Characteristics
u JEDEC SOT-143 package
u Molding compound flammability rating: UL 94V-0
u Marking : Marking code
u Packaging : Tape and Reel per EIA 481
Applications
u ADSL Interfaces
u RS-232, RS-422, V.90 Interfaces
u Multi-Protocol Serial Transceivers
u High-Speed Data Lines
u Portable Electronics
u WAN/LAN Equipment
u Wireless Systems
Circuit Diagram Schematic & PIN Configuration
Revision 9/2000
SOT-143 (Top View)
1
www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Absolute Maximum Rating
LCDA12C-1 & LCDA15C-1
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Electrical Characteristics
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2ã 2000 Semtech Corp.
www.semtech.com
LCDA12C-1 & LCDA15C-1
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve
10
(kW)
PP
1
0.1
Peak Pulse Power - P
0.01
0.1 1 10 100 1000
Pulse Duration - tp (µs)
Pulse Waveform
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
Ambient Temperature - T
Clamping Voltage vs. Peak Pulse Current
28
26
24
(V)
C
22
20
18
16
14
Clamping Voltage - V
12
10
0 5 10 15 20 25
Peak Pulse Current - I
LCDA15C-1
PRELIMINARY
(oC)
A
LCDA12C-1
Waveform
Parameters:
tr = 8µs
td = 20µs
(A)
PP
Variation of Capacitance vs. Reverse Voltage
9
8.5
8
Capacitance (pF)
7.5
7
0123456789101112
Reverse Vol t age (V)
ã 2000 Semtech Corp.
f=1MHz
3
www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Applications Information
Device Connection for Metallic Protection of HighSpeed Data Lines
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
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 connected at pin 3. For common mode protection, ground
either pins 1 & 4 or pins 2 & 3. The ground connection
should be made directly to the ground plane for best
results.
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
the sensitive line driver IC.
LCDA12C-1 & LCDA15C-1
Line
In
Line
In
1
2
4
3
Figure 1 - Connection for Differential Protection
(Line-to-Line)
Line
In
1
2
4
3
Line
Out
Line
Out
Line
Out
Figure 2 - Connection for Common Mode
Protection (Line-to-Ground)
Figure 3 - ADSL Protection Circuit
4ã 2000 Semtech Corp.
www.semtech.com
LCDA12C-1 & LCDA15C-1
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Outline Drawing - SOT-143
PRELIMINARY
Notes:
(1) Controlling dimension: Inch (unless otherwise specified).
(2) Dimension A and B do not include mold protrusions. Mold protrusions are .006 max.
Land Pattern - SOT-143
ã 2000 Semtech Corp.
5
www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Marking Codes
LCDA12C-1 & LCDA15C-1
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1-C21ADCLL21
1-C51ADCLL51
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Ordering Information
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CT.1-C21ADCLV21000,3hcnI7
CT.1-C51ADCLV51000,3hcnI7
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Contact Information
Semtech Corporation
Protection Products Division
652 Mitchell Rd., Newbury Park, CA 91320
Phone: (805)498-2111 FAX (805)498-3804
6ã 2000 Semtech Corp.
www.semtech.com
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