Page 1
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SD05 & SD12
Single Line TVS Diode for ESD
Protection in Portable Electronics
Description
The SDxx TVS diodes are designed to replace multilayer
varistors (MLVs) in portable applications such as cell
phones, notebook computers, and PDAs. They offer
superior electrical characteristics such as lower clamping voltage and no device degradation when compared
to MLVs. The SDxx series TVS diodes are designed to
protect sensitive semiconductor components from
damage or upset due to electrostatic discharge (ESD)
and other voltage induced transient events.
The SDxx is in a SOD-323 package and will protect one
unidirectional line. They are available with working
voltages of 5 volts (SD05) and 12 volts (SD12). These
devices will fit on the same PCB pad area as an 0805
MLV device. They give the designer the flexibility to
protect one line in applications where arrays are not
practical. Additionally, it may be sprinkled around the
board in applications where board space is at a premium.
Features
u 350 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 (tp = 5/50ns)
IEC 61000-4-5 (Lightning) 24A (tp = 8/20µs)
u Small package for use in portable electronics
u Suitable replacement for MLVs in ESD protection
applications
u Protects one I/O or power line
u Low clamping voltage
u Working voltages: 5V & 12V
u Low leakage current
u Solid-state silicon-avalanche technology
Mechanical Characteristics
u EIAJ SOD-323 package
u Molding compound flammability rating: UL 94V-0
u Marking : Marking code, cathode band
u Packaging : Tape and Reel per EIA 481
They may may be used to meet the ESD immunity
requirements of IEC 61000-4-2, Level 4 (15kV air, 8kV
contact discharge).
Applications
u Cell Phone Handsets and Accessories
u Microprocessor based equipment
u Personal Digital Assistants (PDAs)
u Notebooks, Desktops, & Servers
u Portable Instrumentation
u Pagers Peripherals
Schematic & PIN Configuration
12
Revision 9/2000
SOD-323 (Top View)
1
www.semtech.com
Page 2
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Absolute Maximum Rating
SD05 & SD12
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2ã 2000 Semtech Corp.
www.semtech.com
Page 3
SD05 & SD12
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
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:
tr = 8µs
td = 20µs
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)
Clamping Voltage vs. Peak Pulse Current
30
25
(V)
C
20
15
10
Clamping Voltage - V
5
0
0 5 10 15 20 25 30
SD12
Peak Pulse Current - I
SD05
PP
Parameters:
(A)
Waveform
tr = 8µs
td = 20µs
ã 2000 Semtech Corp.
3
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Page 4
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Applications Information
Device Connection Options
The SDxx TVS diodes are designed to protect one data,
I/O, or power supply line. The device is designed to
replace multi-layer varistors (MLVs) in portable
applications. It is easily implemented on existing 0805
MLV pads and is only slightly larger than 0603 MLV
pads. The device is unidirectional and may be used on
lines where the signal polarity is above ground. The
cathode band should be placed towards the line that is
to be protected.
Circuit Board Layout Recommendations for Suppression of ESD.
Good circuit board layout is critical for the suppression
of fast rise-time transients such as ESD. The following
guidelines are recommended (Refer to application note
SI99-01 for more detailed information):
SD05 & SD12
Device Schematic & Pin Configuration
Size Comparison to 0805 MLV
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 The ESD transient return path to ground should
be kept as short as possible.
l Place a TVS & decoupling capacitor between
power and ground of components that may be
vulnerable to electrostatic discharges to the
ground plane.
l Minimize all conductive loops including power
and ground loops.
l Use multilayer boards when possible.
l Minimize interconnecting line lengths
l Never run critical signals near board edges.
l Fill unused portions of the PCB with ground
plane.
SOD-323 0805 MLV
Note: Nominal dimensions in inches
Component Placement Comparison
0805 MLV on SOD-323 on 0805
MLV Pad
SOD-323 on Recommended
(SOD-323) Solder Pad0805 Solder Pad
4ã 2000 Semtech Corp.
www.semtech.com
Page 5
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Outline Drawing - SOD-323
SD05 & SD12
Land Pattern - SOD-323
ã 2000 Semtech Corp.
5
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Page 6
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Marking Codes
SD05 & SD12
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50DSU5
21DSU6
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Ordering Information
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CT.50DSV5000,37
GT.50DSV5000,0131
CT.21DSV21000,37
GT.21DSV21000,0131
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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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