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PROTECTION PRODUCTS
LCDA15C-6
Low Capacitance TVS Diode Array
For Multi-mode Tranciever Protection
Description
The LCDA15C-6 has been specifically designed to
protect sensitive components which are connected to
data and transmission lines from over voltages caused
by ESD (electrostatic discharge), EFT (electrical fast
transients), and lightning.
The low capacitance array configuration of the
LCDA15C-6 allows the user to protect six high-speed
data or I/O lines. They may be used on systems
operating from 5 to 15 Volts. The high surge capability
(500W, tp=8/20µs) makes the LCDA15C-6 suitable for
telecommunications systems operating in harsh transient environments. The low inductance construction
minimizes voltage overshoot during high current
surges.
The features of the LCDA15C-6 are ideal for protecting
multi-protocol transceivers in WAN applications such as
Frame Relay systems, routers, and switches.
Features
u Transient protection for high-speed data lines to
IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
IEC 61000-4-5 (Lightning) 0.5kV, 12A (8/20µs)
u Protects six I/O lines
u Low capacitance for high-speed interfaces
u High surge capability
u Low clamping voltage
u Solid-state silicon avalanche technology
Mechanical Characteristics
u JEDEC SO-8 package
u Molding compound flammability rating: UL 94V-0
u Marking : Part number, date code, logo
u Packaging : Tape and Reel per EIA 481
Applications
u Multi-Mode Transceiver Protection
u WAN Equipment:
CSU/DSU
Multiplexers
Routers
ISP Equipment
Customer Premise Equipment
u Protection for any of the following interfaces:
RS-232 (V.28)
RS-422 (V.11, X.21)
RS-449 (V.11/V.10)
RS-485
Circuit Diagram Schematic & PIN Configuration
SO-8 (Top View)
Revision 9/2000
1
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PROTECTION PRODUCTS
PROTECTION PRODUCTS
Absolute Maximum Rating
LCDA15C-6
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Electrical Characteristics
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2ã 2000 Semtech Corp.
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PROTECTION PRODUCTS
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve
LCDA15C-6
10
(kW)
PP
1
0.1
Peak Pulse Power - P
0.01
0.1 1 10 100 1000
Pulse Duration - tp (µs)
Pulse Waveform Clamping Voltage vs. Peak Pulse Current
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:
td = 20µs
tr = 8µs
110
100
90
PP
80
70
60
50
40
30
% of Rated Power or I
20
10
0
0 25 50 75 100 125 150 175
Ambient Temperature - T
28
26
24
(V)
C
22
20
18
16
14
Clamping Voltage - V
12
10
0 2 4 6 8 10 12 14 16
Peak Pulse Current - I
(oC)
A
Waveform
Parameters:
tr = 8µs
td = 20µs
(A)
PP
ã 2000 Semtech Corp.
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PROTECTION PRODUCTS
PROTECTION PRODUCTS
Applications Information
Device Connection Options for Protection of Six HighSpeed Data Lines
The LCDA16C-6 may be configured to protect up to six
I/O lines operating between 5 and 15V. It may be used
to protect the most popular serial data interface
standard lines making it ideal for use in equipment
utilizing multi-mode transceivers. Data lines are
connected at pins 1, 2, 3, 6, 7, and 8. Pins 4 and 5
are connected to ground. For best results, these pins
should be connected directly to a ground plane on the
board. The path length should be kept as short as
possible to minimize parasitic inductance.
Multi-Mode Transceiver Protection
LCDA15C-6
Device Connection
A typical multi-mode transceiver protection circuit is
shown. The LCDA15C-6 is used to protect I/O lines
with external connections. The LCDA15C-6 adds a
maximum loading capacitance of 15pF with a working
voltage of 15V. This allows the transceiver to safely
operate in all modes without clipping or degradation of
the signal.
With proper design and layout, the transceiver port can
be protected to >15kV (HBM per IEC 61000-4-2).
Circuit Board Layout Recommendations for Suppression of ESD.
Good circuit board layout is critical for the suppression
of fast rise-time transients such as ESD. The following
guidelines are recommended:
l Place the LCDA15C-6 near the input terminals or
connectors to restrict transient coupling.
l Minimize the path length between the LCDA15C-6
and the protected line.
l Minimize all conductive loops including power and
ground loops.
l The ESD transient return path to ground should be
kept as short as possible.
l Never run critical signals near board edges.
l Use ground planes whenever possible.
Multi-Mode Tranceiver Protection Example
4ã 2000 Semtech Corp.
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PROTECTION PRODUCTS
Outline Drawing - SO-8
LCDA15C-6
Land Pattern - SO-8
ã 2000 Semtech Corp.
5
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PROTECTION PRODUCTS
PROTECTION PRODUCTS
Ordering Information
LCDA15C-6
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ET.6-C51ADCLV51005,2hcnI31
Note:
(1) No suffix indicates tube pack.
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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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