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SMF05C
TVS Diode Array
For ESD and Latch-Up Protection
PROTECTION PRODUCTS
Description
The SMF series TVS arrays are designed to protect sensitive electronics from damage or latch-up due to ESD
and other voltage-induced transient events. They are
designed for use in applications where board space is at
a premium. Each device will protect up to five lines. They
are unidirectional devices and may be used on lines where
the signal polarities are above ground.
TVS diodes are solid-state devices designed specifically
for transient suppression. They feature large cross-sectional area junctions for conducting high transient currents. They offer desirable characteristics for board level
protection including fast response time, low operating
and clamping voltage, and no device degradation.
The SMF series devices may be used to meet the immunity requirements of IEC 61000-4-2, level 4. The small
SC70 package makes them ideal for use in portable electronics such as cell phones, PDAs, notebook computers, and digital cameras.
PRELIMINARY
Features
u ESD protection for data lines to
IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact)
u Small package for use in portable electronics
u Protects five I/O lines
u Working voltage: 5V
u Low leakage current
u Low operating and clamping voltages
u Solid-state silicon-avalanche technology
Mechanical Characteristics
u EIAJ SC70-6L package
u Molding compound flammability rating: UL 94V-0
u Marking : Marking Code
u Packaging : Tape and Reel per EIA 481
Applications
u Cellular Handsets & Accessories
u Cordless Phones
u Personal Digital Assistants (PDAs)
u Notebooks & Handhelds
u Portable Instrumentation
u Digital Cameras
u Peripherals
u MP3 Players
Circuit Diagram Schematic & PIN Configuration
13456
1
2
34
Revision 9/2000
2
1
SC70-6L (Top View)
6
5
www.semtech.com
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SMF05C
PROTECTION PRODUCTS
Absolute Maximum Rating
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Electrical Characteristics
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PRELIMINARY
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2ã 2000 Semtech Corp.
www.semtech.com
Page 3
SMF05C
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Typical Characteristics
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 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
Clamping Voltage vs. Peak Pulse Current Junction Capacitance vs. Reverse Voltage
9
8
7
6
5
4
Vclamp (V)
3
2
1
0
0246810
Ipp(A)
Waveform
Parameters:
tr = 8µs
td = 20µs
140
120
100
80
60
Capacitance (pF)
40
20
0
0123456
Power Derating Curve
Ambient Temperature - T
Reverse Voltage (V)
PRELIMINARY
(oC)
A
ESD Clamping Characteristics
(8kV Contact Discharge per IEC 61000-4-2)
ã 2000 Semtech Corp.
3
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Page 4
SMF05C
PROTECTION PRODUCTS
Applications Information
Device Connection for Protection of Five Data Lines
The SMF05C is designed to protect up to five unidirectional data lines. The device is connected as follows:
1. Unidirectional protection of five I/O lines is
achieved by connecting pins 1, 3, 4, 5 and 6 to the
data lines. Pin 2 is connected to ground. The
ground connection 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 SMF05C near the input terminals or
connectors to restrict transient coupling.
l Minimize the path length between the SMSxxC 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.
PRELIMINARY
SMF05C Circuit Diagram
13456
2
Protection of Five Unidirectional Lines
4ã 2000 Semtech Corp.
www.semtech.com
Page 5
SMF05C
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Typical Applications
PRELIMINARY
ã 2000 Semtech Corp.
5
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Page 6
SMF05C
PROTECTION PRODUCTS
Outline Drawing - SC70-6L
PRELIMINARY
Land Pattern - SC70-6L
6ã 2000 Semtech Corp.
www.semtech.com
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SMF05C
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Marking Codes
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Note:
(1) Pin 1 Identified with a dot
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Ordering Information
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PRELIMINARY
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Contact Information
ã 2000 Semtech Corp.
Semtech Corporation
Protection Products Division
652 Mitchell Rd., Newbury Park, CA 91320
Phone: (805)498-2111 FAX (805)498-3804
7
www.semtech.com
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