PROTECTION PRODUCTS
1www.semtech.com
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
Bidirectional TVS Array
for Protection of Eight Lines
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)
Small SO-14 surface mount package
Protects eight I/O lines
Working voltages: 5V, 12V, 15V and 24V
Low leakage current
Low operating and clamping voltages
Solid-state silicon avalanche technology
Description Features
Circuit Diagram Schematic & PIN Configuration
Revision 01/29/03
Applications
Mechanical Characteristics
The SMDAxxC-8 series of transient voltage suppres-
sors are designed to protect components which are
connected to data and transmission lines from voltage
surges caused by electrostatic discharge (ESD), electri-
cal fast transients (EFT), and lightning.
TVS diodes are characterized by their high surge
capability, low operating and clamping voltages, and
fast response time. This makes them ideal for use as
board level protection of sensitive semiconductor
components. The SMDAxxC-8 is designed to provide
transient suppression on multiple data lines and I/O
ports. The low profile SO-14 design allows the user to
protect up to eight data and I/O lines with one pack-
age. They are bidirectional device and may be used on
lines where the normal operating voltage is above and
below ground (i.e. -12V to +12V).
The SMDAxxC-8 TVS diode array will meet the surge
requirements of IEC 61000-4-2 (Formerly IEC 801-2),
Level 4, “Human Body Model” for air and contact
discharge.
SO-14 (Top View)
RS-232 and RS-422 Data Lines
Microprocessor Based Equipment
LAN/WAN Equipment
Set-Top Box
Notebooks, Desktops, & Servers
Portable Instrumentation
Peripherals
Serial and Parallel Ports
JEDEC SO-14 package
Molding compound flammability rating: UL 94V-0
Marking : Part Number, Logo, Date Code
Packaging : Tape and Reel per EIA 481
1
2
3
4
5
6
78
9
10
11
12
13
14
7 & 8
2 3 12 13 5 6 9 10
1 & 14
22003 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
Absolute Maximum Rating
Electrical Characteristics
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3
2003 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
8-C51ADMS
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Electrical Characteristics (Continued)
42003 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve
0
10
20
30
40
50
60
70
80
90
100
110
0 5 10 15 20 25 30
Time (µs)
Percent of IPP
e-t
td = IPP/2
Waveform
Parameters:
tr = 8µs
td = 20µs
Pulse Waveform
ESD Pulse Waveform (IEC 61000-4-2)
0
10
20
30
40
50
60
70
80
90
100
110
0 25 50 75 100 125 150
Ambient Temperature - TA (oC)
% of Rated Power or IPP
0.01
0.1
1
10
0.1 1 10 100 1000
Pulse Duration - tp (µs)
Peak Pul se P o wer - P pk (kW )
IEC 61000-4-2 Discharge Parameters
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5
2003 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
Circuit Diagram
Connection Diagram
Device Connection for Protection of Eight Data Lines
The SMDAxxC-8 is designed to protect up to 8 data or
I/O lines. They are bidirectional devices and may be
used on lines where the signal polarities are above and
below ground.
The SMDAxxC-8 TVS arrays employ a monolithic struc-
ture. Therefore, the working voltage (VRWM) and break-
down voltage (VBR) specifications apply to the differen-
tial voltage between any two data line pins. For ex-
ample, the SMDA24C-8 is designed for a maximum
voltage excursion of ±12V between any two data lines.
The device is connected as follows:
zPins 2, 3, 5, 6, 9, 10, 12 and 13 are connected to
the lines that are to be protected. Pins 1, 7, 8,
and 14 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. Pins 4 and 11 are
not connected.
Circuit Board Layout Recommendations for Suppres-
sion of ESD.
Good circuit board layout is critical for the suppression
of ESD induced transients. The following guidelines are
recommended:
zPlace the TVS near the input terminals or connec-
tors to restrict transient coupling.
zMinimize the path length between the TVS and the
protected line.
zMinimize all conductive loops including power and
ground loops.
zThe ESD transient return path to ground should be
kept as short as possible.
zNever run critical signals near board edges.
zUse ground planes whenever possible.
G
ND
G
ND
I
/O 1
I
/O 2
N
.C.
I
/O 3
I
/O 4
GND
N.C
.
GND
I/O 5
I/O 6
I/O 7
I/O 8
1
2
3
4
5
6
78
9
10
11
12
13
14
Applications Information
62003 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
Land Pattern - SO-14
Outline Drawing - SO-14
7
2003 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
Contact Information
Semtech Corporation
Protection Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
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ET.8-C50ADMSV5005,2hcnI31
ET.8-C21ADMSV21005,2hcnI31
ET.8-C51ADMSV51005,2hcnI31
ET.8-C42ADMSV42005,2hcnI31
Note:
(1) No suffix indicates tube pack.
Ordering Information