LCDA12C-1 & LCDA15C-1
Low Capacitance TVS Diode Array
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 degra-
dation.
The configuration of the LCDAxxC-1 has been optimized
for easy layout on high density boards. The small SOT-
143 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 inter-
faces, 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
u
u
u
u
u
u
u
u
u
u
u
(20A, tp=8/20µs)
Configuration optimized for easy board layout
Protects one line pair
Low capacitance (<15pF) for high-speed interfaces
Low clamping voltage
Low leakage current
Operating voltage: 12V & 15V
Solid-state silicon-avalanche technology
Mechanical Characteristics
JEDEC SOT-143 package
Molding compound flammability rating: UL 94V-0
Marking : Marking code
Packaging : Tape and Reel per EIA 481
Applications
u
u
u
u
u
u
u
ADSL Interfaces
RS-232, RS-422, V.90 Interfaces
Multi-Protocol Serial Transceivers
High-Speed Data Lines
Portable Electronics
WAN/LAN Equipment
Wireless Systems
Circuit Diagram
Schematic & PIN Configuration
SOT-143 (Top View)
Revision 9/2000
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LCDA12C-1 & LCDA15C-1
PROTECTION PRODUCTS
Absolute Maximum Rating
R ating
Peak Pulse Pow er (tp = 8/20µ s)
Peak Pulse Current (tp = 8/20µ s)
Lead Sold ering Temp erature
Op erating Temp erature
Storage Temp erature
Symbo l
P
p k
I
PP
T
L
T
J
T
STG
Value
500
20
260 (10 sec.)
-55 to +125
-55 to +150
Units
Watts
A
°C
°C
°C
Electrical Characteristics
LCDA12C-1
Par ame te r
Reverse Stand-Off Voltage
Reverse Breakdow n Voltage
Reverse Leakage Current
Clamp ing Voltage
Clamp ing Voltage
Junction Cap acitance
Symbo l
V
RWM
V
BR
I
R
V
C
V
C
C
j
I
t
= 1mA
V
RWM
= 12V, T=25°C
I
PP
= 5A, tp = 8/20µs
I
PP
= 20A, tp = 8/20µs
Betw een I/O p ins and
Gnd
V
R
= 0V, f = 1MHz
8
13.3
5
19
26.6
15
Co nd itio ns
Minimum
Typ ical
Maximum
12
Units
V
V
µA
V
V
pF
LCDA15C-1
Par ame te r
Reverse Stand-Off Voltage
Reverse Breakdow n Voltage
Reverse Leakage Current
Clamp ing Voltage
Clamp ing Voltage
Junction Cap acitance
Symbo l
V
RWM
V
BR
I
R
V
C
V
C
C
j
I
t
= 1mA
V
RWM
= 15V, T=25°C
I
PP
= 1A, tp = 8/20µs
I
PP
= 15A, tp = 8/20µs
Betw een I/O p ins and
Gnd
V
R
= 0V, f = 1MHz
8
16.7
5
24
33
15
Co nd itio ns
Minimum
Typ ical
Maximum
15
Units
V
V
µA
V
V
pF
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LCDA12C-1 & LCDA15C-1
PROTECTION PRODUCTS
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
10
110
100
PRELIMINARY
Power Derating Curve
Peak Pulse Power - P
PP
(kW)
% of Rated Power or I
PP
90
80
70
60
50
40
30
20
10
1
0.1
0.01
0.1
1
10
Pulse Duration - tp (µs)
100
1000
0
0
25
50
75
100
125
150
Ambient Temperature - T
A
(
o
C)
Pulse Waveform
110
100
90
80
Percent of I
PP
70
60
50
40
30
20
10
0
0
5
10
15
Time (µs)
20
25
30
td = I
PP
/2
e
-t
Clamping Voltage vs. Peak Pulse Current
28
Waveform
Parameters:
tr = 8µs
td = 20µs
26
Clamping Voltage - V
C
(V)
24
22
20
18
16
14
12
10
0
5
10
15
20
25
Peak Pulse Current - I
PP
(A)
Waveform
Parameters:
tr = 8µs
td = 20µs
LCDA15C-1
LCDA12C-1
Variation of Capacitance vs. Reverse Voltage
9
8.5
Capacitance (pF)
8
7.5
f=1MHz
7
0
1
2
3
4
5
6
7
8
9
10
11
12
Reverse Voltage (V)
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LCDA12C-1 & LCDA15C-1
PROTECTION PRODUCTS
Applications Information
Device Connection for Metallic Protection of High-
Speed 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 con-
nected 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.
Line
In
4
1
Line
Out
Line
In
2
3
Line
Out
Figure 1 - Connection for Differential Protection
(Line-to-Line)
Line
Out
Line
In
4
1
2
3
Figure 2 - Connection for Common Mode
Protection (Line-to-Ground)
Figure 3 - ADSL Protection Circuit
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LCDA12C-1 & LCDA15C-1
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
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