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PROTECTION PRODUCTS
PROTECTION PRODUCTS
SDC15
TVS Diode Array for ESD Protection
of 12V Data & Power Lines
Description
The SDC15 transient voltage suppressor (TVS) is
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 dual-junction common-cathode
design allows the user to protect one data or power
line operating at +/-12 volts. The low profile SOT23
package allows flexibility in the design of crowded
circuit boards.
The SDC15 TVS 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 40 watts peak pulse power (tp = 10/1000µs)
u Transient protection for data & power 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 (1.2/50µs)
u Protects one bidirectional line
u Low clamping voltage
u Low leakage current
u High surge capability
u Solid-state silicon avalanche technology
Mechanical Characteristics
u JEDEC SOT23 package
u Molding compound flammability rating: UL 94V-0
u Marking : DC15
u Packaging : Tape and Reel per EIA 481
Applications
u RS-232 Data Lines
u Portable Electronics
u Industrial Controls
u Set-Top Box
u Servers, Notebook, and Desktop PC
u 12V DC Supply Protection
Circuit Diagram Schematic & PIN Configuration
Revision 9/2000
SOT23 (Top View)
1
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PROTECTION PRODUCTS
PROTECTION PRODUCTS
Absolute Maximum Rating
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2ã 2000 Semtech Corp.
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Page 3
PROTECTION PRODUCTS
µ
Typical Characteristics
SDC15
Non-Repetitive Peak Pulse Power vs. Pulse Time
10
(kW)
PP
1
0.1
Peak Pulse Power - P
0.01
0.1 1 10 100 1000
Pulse Duratio n - tp (µs)
Pulse Waveform Clamping Voltage vs. Peak Pulse Current
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
td = IPP/2
Time (µs)
Waveform
Parameters:
tr = 8µs
td = 20µs
Power Derating Curve
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
25
(V)
C
20
15
Clamping Voltage - V
10
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Peak Pulse Current - I
(oC)
A
Bidirectional
(Pin 1 to 2)
(A)
PP
Waveform
Parameters:
tr = 8µs
td = 20µs
Forward Voltage vs. Forward Current
3
2.5
(V)
F
2
1.5
1
Forward Voltage - V
0.5
0
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Forward Current - I
(A)
F
ã 2000 Semtech Corp.
Waveform
Parameters:
tr = 8µs
s
td = 20
3
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PROTECTION PRODUCTS
PROTECTION PRODUCTS
Applications Information
Device Connection for Protection of One Data Line
The SDC15 is designed to protect one data or I/O line
operating at +/- 12 volts. Connection options are as
follows:
l Common mode protection: Pin 1 is connected to
the data line and pin 2 is connected to ground. For
best results, this pin should be connected directly
to a ground plane on the board. The path length
should be kept as short as possible to minimize
parasitic inductance. Pin 3 is not connected.
l Differential protection: Pin 1 is connected to one
line and pin 2 is connected to the second line. Pin
3 is not connected.
SDC15
Device Schematic & Pin Configuration
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:
l Place the SDC15 near the input terminals or
connectors to restrict transient coupling.
l Minimize the path length between the SDC15 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.
RS-232 Transceiver Protection Example
4ã 2000 Semtech Corp.
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PROTECTION PRODUCTS
Outline Drawing - SOT23
SDC15
Land Pattern - SOT23
Note 1 : Grid placement courtyard is 8 x 8 elements (4mm x 4mm) in accordance with the international grid detailed in IEC
Publication 97.
ã 2000 Semtech Corp.
5
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Page 6
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Ordering Information
SDC15
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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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