PROTECTION PRODUCTS
LCDA12C-8 & LCDA15C-8
Low Capacitance TVS Diode Array
For Multi-mode Transceiver Protection
Description
The LCDAxxC-8 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
LCDAxxC-8 allows the user to protect eight 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 LCDAxxC-8 suitable for
telecommunications systems operating in harsh transient environments. The low inductance construction
minimizes voltage overshoot during high current
surges.
The features of the LCDAxxC-8 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 eight 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-16 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)
Circuit Diagram Schematic & PIN Configuration
SO-16 (Top View)
Revision 9/2000
1
www.semtech.com
PROTECTION PRODUCTS
Absolute Maximum Rating
LCDA12C-8 & LCDA15C-8
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Electrical Characteristics
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2ã 2000 Semtech Corp.
www.semtech.com
LCDA12C-8 & LCDA15C-8
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)
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
A
(oC)
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
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-8
PP
(A)
LCDA12C-8
Waveform
Parameters:
tr = 8µs
td = 20µs
ã 2000 Semtech Corp.
3
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PROTECTION PRODUCTS
Applications Information
Device Connection Options for Protection of Eight
High-Speed Data Lines
The LCDAxxC-8 may be configured to protect up to
eight 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. The LCDAxxC-8 is
symmetrical so the data lines may be connected at
pins 1-8 or 9-16. Pins 9-16 or 1-8 are connected to
ground as shown. 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
LCDA12C-8 & LCDA15C-8
Device Connection
The LCDAxxC-8 may be used to protect multi-mode
transceiver I/O lines with external connections. The
LCDAxxC-8 adds a maximum loading capacitance of
15pF with a working voltage of 12V or 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 LCDAxxC-8 near the input terminals or
connectors to restrict transient coupling.
l Minimize the path length between the LCDAxxC-8
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.
4ã 2000 Semtech Corp.
www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Outline Drawing - SO-16
LCDA12C-8 & LCDA15C-8
Land Pattern - SO-16
ã 2000 Semtech Corp.
5
www.semtech.com
PROTECTION PRODUCTS
Ordering Information
LCDA12C-8 & LCDA15C-8
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ET.8-C21ADCLV21005,2hcnI31
ET.8-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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