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Электронный компонент: SDC15

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PROTECTION PRODUCTS
1
www.semtech.com
PROTECTION PRODUCTS
SDC15
TVS Diode Array for ESD Protection
of 12V Data & Power Lines
Description
Features
Circuit Diagram
Schematic & PIN Configuration
Revision 9/2000
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 (electri-
cal 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.
Applications
Mechanical Characteristics
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
u
300 watts peak pulse power (tp = 8/20s)
u
40 watts peak pulse power (tp = 10/1000s)
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 (1.2/50s)
u
Protects one bidirectional line
u
Low clamping voltage
u
Low leakage current
u
High surge capability
u
Solid-state silicon avalanche technology
u
JEDEC SOT23 package
u
Molding compound flammability rating: UL 94V-0
u
Marking : DC15
u
Packaging : Tape and Reel per EIA 481
SOT23 (Top View)
2
2000 Semtech Corp.
www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SDC15
Absolute Maximum Rating
Electrical Characteristics
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3
2000 Semtech Corp.
www.semtech.com
PROTECTION PRODUCTS
SDC15
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
0
10
20
30
40
50
60
70
80
90
100
110
0
25
50
75
100
125
150
Ambient Temperature - T
A
(
o
C)
%
of Rated Power or I
PP
Power Derating Curve
Pulse Waveform
Clamping Voltage vs. Peak Pulse Current
0
10
20
30
40
50
60
70
80
90
100
110
0
5
10
15
20
25
30
Time (
s)
Percent of I
PP
e
-t
td = I
PP
/2
Waveform
Parameters:
tr = 8
s
td = 20
s
Forward Voltage vs. Forward Current
10
15
20
25
1
2
3
4
5
6
7
8
9
10
11
12
Peak Pulse Current - I
PP
(A)
Clamping Voltage - V
C
(V)
Waveform
Parameters:
tr = 8
s
td = 20
s
Bidirectional
(Pin 1 to 2)
0
0.5
1
1.5
2
2.5
3
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1
2
3
4
5
6
7
8
9
10
11
12
Forward Current - I
F
(A)
Forward Voltage - V
F
(V)
Waveform
Parameters:
tr = 8
s
td = 20
s
0.01
0.1
1
10
0.1
1
10
100
1000
Pulse Duration - tp (
s)
P
eak P
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se P
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wer - P
PP
(kW)
4
2000 Semtech Corp.
www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SDC15
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.
Circuit Board Layout Recommendations for Suppres-
sion 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.
Device Schematic & Pin Configuration
RS-232 Transceiver Protection Example
Applications Information
5
2000 Semtech Corp.
www.semtech.com
PROTECTION PRODUCTS
SDC15
Note 1 : Grid placement courtyard is 8 x 8 elements (4mm x 4mm) in accordance with the international grid detailed in IEC
Publication 97.
Outline Drawing - SOT23
Land Pattern - SOT23