Page 1
PROTECTION PRODUCTS
SMDA05C THRU SMDA24C
Bidirectional TVS Array
for Protection of Four Lines
Description
The SMDAxxC series of TVS arrays are designed to
provide bidirectional protection for sensitive electronics
from damage or latch-up due to ESD, lightning and
other voltage-induced transient events. Each device
will protect four data or I/O lines. They are available
with operating voltages of 5V, 12V, 15V and 24V.
TVS diodes are solid-state devices designed specifically
for transient suppression. They offer desirable characteristics for board level protection including fast response time, low operating and clamping voltage and
no device degradation. The low profile SO-8 package
allows the user to protect up to four independent lines
with one package. The SMDAxxC series is suitable
protection for sensitive semiconductors components
such as microprocessors, ASICs, transceivers, transducers, and CMOS memory.
The SMDAxxC series devices may be used to meet the
ESD immunity requirements of IEC 61000-4-2, level 4
for air and contact discharge.
Features
u Transient protection for 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) 12A (8/20µs)
u Bidirectional protection
u Small SO-8 package
u Protects four I/O lines
u Working voltages: 5V, 12V, 15V and 24V
u Low leakage current
u Low operating and clamping voltages
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 : Tube or Tape and Reel per EIA 481
Applications
u Data and I/O Lines
u Microprocessor based equipment
u Notebooks, Desktops, and Servers
u Instrumentation
u LAN/WAN equipment
u Peripherals
u Serial and Parallel Ports
Revision 9/2000
Schematic & PIN Configuration
1
2
3
45
SO-8 (Top View)
1
8
7
6
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PROTECTION PRODUCTS
Absolute Maximum Rating
SMDA05C THRU SMDA24C
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Electrical Characteristics
C50ADMS
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t
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sµ02/8=pt,A5=11V
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5V
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PP
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PP
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Am1=3.31V
t
C°52=T,V21=1Aµ
sµ02/8=pt,A1=91V
sµ02/8=pt,A5=42V
sµ02/8=pt21A
zHM1=f,V0=021Fp
21V
2ã 2000 Semtech Corp.
www.semtech.com
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PROTECTION PRODUCTS
PROTECTION PRODUCTS
Electrical Characteristics (Continued)
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I
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C
C
PP
j
V
MWR
I
PP
I
PP
V
R
Am1=7.61V
t
C°52=T,V51=1Aµ
sµ02/8=pt,A1=42V
sµ02/8=pt,A5=03V
sµ02/8=pt01A
zHM1=f,V0=57Fp
51V
C42ADMS
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MWR
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PP
Am1=7.62V
t
C°52=T,V42=1Aµ
sµ02/8=pt,A1=34V
42V
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ã 2000 Semtech Corp.
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sµ02/8=pt,A5=55V
sµ02/8=pt5A
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3
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Page 4
SMDA05C THRU SMDA24C
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
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
A
(oC)
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:
ESD Pulse Waveform (IEC 61000-4-2)
tr = 8µs
td = 20µs
IEC 61000-4-2 Discharge Parameters
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4ã 2000 Semtech Corp.
www.semtech.com
Page 5
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Applications Information
SMDA05C THRU SMDA24C
Device Connection for Protection of Four Data Lines
The SMDAxxC series devices are designed to protect
up to four data lines. The devices are connected as
follows:
l The SMDAxxC are bidirectional devices and are
designed for use on lines where the normal operating voltage is above and below ground. Pins 1, 2,
3, and 4 are connected to the protected lines.
Pins 5, 6, 7, and 8 are connected to ground. Since
the device is electrically symmetrical, these connections may be reversed. The ground connections
should be made directly to the ground plane for
best results. The path length is kept as short as
possible to reduce the effects of parasitic inductance in the board traces.
Circuit Board Layout Recommendations for Suppression of ESD.
Good circuit board layout is critical for the suppression
of ESD induced transients. The following guidelines are
recommended:
Circuit Diagram
1
2
3
45
8
7
6
I/O Line Protection
l Place the TVS near the input terminals or connec-
tors to restrict transient coupling.
l Minimize the path length between the TVS 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.
Typical Connection
To Protected
Device
1
2
3
45
8
7
Ground
6
ã 2000 Semtech Corp.
From Connector
5
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Page 6
PROTECTION PRODUCTS
Outline Drawing - SO-8
SMDA05C THRU SMDA24C
Land Pattern - SO-8
6ã 2000 Semtech Corp.
www.semtech.com
Page 7
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Ordering Information
SMDA05C THRU SMDA24C
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BT.C50ADMSV5005hcnI7
BT.C21ADMSV21005hcnI7
BT.C51ADMSV51005hcnI7
BT.C42ADMSV42005hcnI7
Note:
(1) No suffix indicates tube pack.
(2) Consult factory for availability of 13 Inch reels.
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Contact Information
ã 2000 Semtech Corp.
Semtech Corporation
Protection Products Division
652 Mitchell Rd., Newbury Park, CA 91320
Phone: (805)498-2111 FAX (805)498-3804
7
www.semtech.com
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