PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05-6
Unidirectional TVS Array
for Protection of Six Lines
Description
The SMDA series of transient voltage suppressors are
designed to protect components which are connected
to data and transmission lines from voltage surges
caused by ESD (electrostatic discharge), EFT (electrical
fast transients), 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 SMDA05-6 is designed to provide
transient suppression on multiple data lines and I/O
ports. It is designed to operate on 5V digital lines. The
low profile SO-8 design allows the user to protect up to
six data and I/O lines with one package.
The SMDA05-6 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.
Features
u 300 watts peak pulse power (tp = 8/20µs)
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 Protects up to 6 unidirectional lines
u Low operating voltage
u Low clamping voltage
u Solid-state silicon avalanche technology
Mechanical Characteristics
u JEDEC SO-8 package
u UL 497B listed
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 5V data & I/O lines
u Communication lines
u Microprocessor based equipment
u LAN/WAN equipment
u Servers
u Notebook & Desktop PC
u Instrumentation
u Peripherals
Circuit Diagram Schematic & PIN Configuration
SO-8 (Top View)
Revision 9/2000
1
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PROTECTION PRODUCTS
Absolute Maximum Rating
SMDA05-6
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2ã 2000 Semtech Corp.
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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
Ambient Temperature - T
SMDA05-6
(oC)
A
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:
ESD Pulse Waveform (IEC 61000-4-2)
tr = 8µs
td = 20µs
Clamping Voltage vs. Peak Pulse Current
11
10
9
(V)
8
C
7
6
5
4
3
Clamping Voltage - V
2
1
0
0 2 4 6 8 10 12 14 16 18
Peak Pulse Current - I
PP
(A)
Waveform
Parameters:
tr = 8µs
td = 20µs
IEC 61000-4-2 Discharge Parameters
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PROTECTION PRODUCTS
Applications Information
SMDA05-6
Device Connection for Protection of Six Data Lines
The SMDA05-6 is designed to protect up to 6 data or
I/O lines operating at 5 volts. They are unidirectional
devices and may be used on lines where the signal
polarities are above ground (i.e. 0 to 5V).
The device is connected as follows:
l Pins 1, 2, 3, 4, 5 and 8 are connected to the lines
that are to be protected. Pins 6 and 7 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 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.
Circuit Diagram
Connection Diagram
DATA IN DATA OUT
678
5
123
4
DATA IN
4ã 2000 Semtech Corp.
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DATA OUT
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Outline Drawing - SO-8
SMDA05-6
Land Pattern - SO-8
ã 2000 Semtech Corp.
5
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PROTECTION PRODUCTS
Ordering Information
SMDA05-6
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BT.6-50ADMSV5005hcnI7
ET.6-50ADMSV5005,2hcnI31
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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