PROTECTION PRODUCTS
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PROTECTION PRODUCTS
SMDA05C-7 THRU SMDA24C-7
Bidirectional TVS Array
for Protection of Seven 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-8 surface mount package
Protects seven 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
Schematic and PIN Configuration
Revision 8/15/06
Applications
Mechanical Characteristics
The SMDAxxC-7 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-7 is designed to provide
transient suppression on multiple data lines and I/O
ports. The low profile SO-8 design allows the user to
protect up to seven data and I/O lines with one pack-
age.
The SMDAxxC-7 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-8 (Top View)
JEDEC SO-8 package
Molding compound flammability rating: UL 94V-0
Marking : Part number, date code, logo
Packaging : Tube or Tape and Reel per EIA 481
RS-232 and RS-422 Data Lines
Microprocessor Based Equipment
LAN/WAN Equipment
Notebooks, Desktops, and Servers
Instrumentation
Peripherals
Set Top Box
Serial and Parallel Ports
2 2004 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-7 THRU SMDA24C-7
Absolute Maximum Rating
Electrical Characteristics
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3 2004 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-7 THRU SMDA24C-7
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Electrical Characteristics (Continued)
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PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-7 THRU SMDA24C-7
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 I
PP
0.01
0.1
1
10
0.1 1 10 100 1000
Pulse Duration - tp (µs)
Peak Pulse Power - PPk (kW)
IEC 61000-4-2 Discharge Parameters
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5 2004 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-7 THRU SMDA24C-7
Circuit Diagram
Connection Diagram
Device Connection for Protection of Seven Data Lines
The SMDAxxC-7 is designed to protect up to 7 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-7 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-7 is designed for a maximum
voltage excursion of ±12V between any two data lines.
The device is connected as follows:
zPins 1, 2, 3, 4, 5, 6 and 7 are connected to the
lines that are to be protected. Pin 8 is 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 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.
123
4
5
678
DATA IN DATA OUT
DATA IN DATA OUT
Applications Information
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PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-7 THRU SMDA24C-7
Land Pattern - SO-8
Outline Drawing - SO-8
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PLANE
3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
-B-
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
DATUMS AND TO BE DETERMINED AT DATUM PLANE
NOTES:
1.
2. -A- -H-
REFERENCE JEDEC STD MS-012, VARIATION AA.
4.
.050 BSC
.236 BSC
8
.010
.150
.189
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.193
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8
0.25
1.27 BSC
6.00 BSC
3.90
4.90
-
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3.80
4.80
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4.00
5.00
0.51
(.041)
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8° 0°
0.20
0.10
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0.17
1.25
0.10
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1.35
(1.04)
0.72
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1.04
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DIM MIN
MILLIMETERS
NOM
DIMENSIONS
INCHES
MIN MAX MAXNOM
E
(.205) (5.20)
Z
G
Y
P
(C) 3.00
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1.27
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0.60.024
2.20.087
7.40.291
X
INCHES
DIMENSIONS
Z
P
Y
X
DIM
C
G
MILLIMETERS
THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
NOTES:
1.
REFERENCE IPC-SM-782A, RLP NO. 300A.
2.
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PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-7 THRU SMDA24C-7
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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BT.7-C50ADMSbPnS005hcnI7
BT.7-C21ADMSbPnS005hcnI7
BT.7-C51ADMSbPnS005hcnI7
BT.7-C42ADMSbPnS005hcnI7
TBT.7-C50ADMSeerFbP005hcnI7
TBT.7-C21ADMSeerFbP005hcnI7
TBT.7-C51ADMSeerFbP005hcnI7
TBT.7-C42ADMSeerFbP005hcnI7
7-C50ADMSbPnSebuT/59A/N
7-C21ADMSbPnSebuT/59A/N
7-C51ADMSbPnSebuT/59A/N
7-C42ADMSbPnSebuT/59A/N
T.7-C50ADMSeerFbPebuT/59A/N
T.7-C21ADMSeerFbPebuT/59A/N
T.7-C51ADMSeerFbPebuT/59A/N
T.7-C42ADMSeerFbPebuT/59A/N
Ordering Information
Note: Lead-free devices are RoHS/WEEE Compliant
