Page 1
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05 THRU SMDA24
Unidirectional TVS Array
for Protection of Four Lines
Description
The SMDAxx series of TVS arrays are designed to provide
undirectional 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 SMDAxx series is suitable protection for
sensitive semiconductors components such as microprocessors, ASICs, transceivers, transducers, and CMOS
memory.
The SMDAxx 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 Undirectional 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 RS-232 data lines
u Microprocessor based equipment
u Notebooks, Desktops, & 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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Page 2
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Absolute Maximum Rating
SMDA05 THRU SMDA24
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Electrical Characteristics
50ADMS
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C
C
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PP
I
PP
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t
C°52=T,V5=02Aµ
sµ02/8=pt,A1=8.9V
sµ02/8=pt,A5=11V
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5V
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21ADMS
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MWR
I
PP
I
PP
V
R
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=051Fp
21V
2ã 2000 Semtech Corp.
www.semtech.com
Page 3
PROTECTION PRODUCTS
Electrical Characteristics (Continued)
51ADMS
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SMDA05 THRU SMDA24
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MWR
I
RB
R
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=001Fp
51V
42ADMS
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C
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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
zHM1=f,V0=06Fp
3
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Page 4
SMDA05 THRU SMDA24
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
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
Applications Information
Device Connection for Protection of Four Data Lines
The SMDAxx series devices are designed to protect up to
four data lines. The devices are connected as follows:
SMDA05 THRU SMDA24
Circuit Diagram
l The SMDAxx are unidirectional devices and are
designed for use on lines where the normal operating voltage is above ground. Pins 1, 2, 3, and 4 are
connected to the protected lines. Pins 5, 6, 7, and 8
are connected to ground. 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:
l Place the TVS near the input terminals or connectors
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.
1
2
3
45
8
7
6
I/O Line Protection
ã 2000 Semtech Corp.
Typical Connection
To Protected
Device
1
2
3
45
From Connector
5
8
7
Ground
6
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Page 6
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Outline Drawing - SO-8
SMDA05 THRU SMDA24
Land Pattern - SO-8
6ã 2000 Semtech Corp.
www.semtech.com
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PROTECTION PRODUCTS
Ordering Information
SMDA05 THRU SMDA24
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BT.50ADMSV5005hcnI7
BT.21ADMSV21005hcnI7
BT.51ADMSV51005hcnI7
BT.42ADMSV42005hcnI7
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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