SEMTECH SMS12

SMS05 THRU SMS24
TVS Diode Array
For ESD and Latch-Up Protection
PROTECTION PRODUCTS
Description
Features
u Transient protection for data lines to
The SMS series of TVS arrays are designed to protect
sensitive electronics from damage or latch-up due to
ESD and other voltage-induced transient events. Each
device will protect up to four lines. They are available
with operating voltages of 5V, 12V, 15V and 24V. 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 crosssectional 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 SMS series devices may be used to meet the
immunity requirements of IEC 61000-4-2, level 4. The
low cost SOT23-6L package makes them ideal for use
in portable electronics such as cell phones, PDA’s, and
notebook computers.
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IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
IEC 61000-4-5 (Lightning) 24A (8/20µs)
Small package for use in portable electronics
Protects four I/O lines
Working voltages: 5V, 12V, 15V and 24V
Low leakage current
Low operating and clamping voltages
Solid-state silicon avalanche technology
Mechanical Characteristics
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EIAJ SOT23-6L package
Molding compound flammability rating: UL 94V-0
Marking : Marking Code
Packaging : Tape and Reel per EIA 481
Applications
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Circuit Diagram
Cell phone Handsets and Accessories
Microprocessor Based Equipment
Personal Digital Assistants (PDA’s) and Pagers
Desktops PC and Servers
Notebook, Laptop, and Palmtop Computers
Portable Instrumentation
Peripherals
MP3 Players
Cordless Phones
Schematic & PIN Configuration
SOT23-6L (Top View)
Revision 9/2000
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SMS05 THRU SMS24
PROTECTION PRODUCTS
Absolute Maximum Rating
R ating
Symbo l
Value
Units
Peak Pulse Pow er (tp = 8/20µs)
Pp k
350
Watts
Peak Pulse Current (tp = 8/20µs)
I PP
24
A
ESD Voltage (HBM p er IEC 61000-4-2)
V PP
>25
kV
Lead Soldering Temp erature
TL
260 (10 sec.)
°C
Op erating Temp erature
TJ
-55 to +125
°C
TSTG
-55 to +150
°C
Storage Temp erature
Electrical Characteristics
SMS05
Par ame te r
Symbo l
Co nd itio ns
Minimum
Typ ical
Maximum
Units
5
V
Reverse Stand-Off Voltage
VRWM
Reverse Breakdow n Voltage
V BR
It = 1mA
Reverse Leakage Current
IR
VRWM = 5V, T=25°C
20
µA
Clamp ing Voltage
VC
IPP = 5A, tp = 8/20µs
9.8
V
Clamp ing Voltage
VC
IPP = 24A, tp = 8/20µs
14.5
V
Junction Cap acitance
Cj
Betw een I/O Pins and
Gnd
V R = 0V, f = 1MHz
325
400
pF
Symbo l
Co nd itio ns
Typ ical
Maximum
Units
12
V
6
V
SMS12
Par ame te r
Minimum
Reverse Stand-Off Voltage
VRWM
Reverse Breakdow n Voltage
V BR
It = 1mA
Reverse Leakage Current
IR
VRWM = 12V, T=25°C
1
µA
Clamp ing Voltage
VC
IPP = 5A, tp = 8/20µs
19
V
Clamp ing Voltage
VC
IPP = 15A, tp = 8/20µs
23
V
Junction Cap acitance
Cj
Betw een I/O Pins and
Gnd
V R = 0V, f = 1MHz
150
pF
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SMS05 THRU SMS24
PROTECTION PRODUCTS
Electrical Characteristics (Continued)
SMS15
Par ame te r
Symbo l
Co nd itio ns
Minimum
Typ ical
Maximum
Units
15
V
Reverse Stand-Off Voltage
VRWM
Reverse Breakdow n Voltage
V BR
It = 1mA
Reverse Leakage Current
IR
VRWM = 15V, T=25°C
1
µA
Clamp ing Voltage
VC
IPP = 5A, tp = 8/20µs
24
V
Clamp ing Voltage
VC
IPP = 12A, tp = 8/20µs
29
V
Junction Cap acitance
Cj
Betw een I/O Pins and
Gnd
V R = 0V, f = 1MHz
100
125
pF
Symbo l
Co nd itio ns
Typ ical
Maximum
Units
24
V
16.7
V
SMS24
Par ame te r
Minimum
Reverse Stand-Off Voltage
VRWM
Reverse Breakdow n Voltage
V BR
It = 1mA
Reverse Leakage Current
IR
VRWM = 24V, T=25°C
1
µA
Clamp ing Voltage
VC
IPP = 5A, tp = 8/20µs
40
V
Clamp ing Voltage
VC
IPP = 8A, tp = 8/20µs
44
V
Junction Cap acitance
Cj
Betw een I/O Pins and
Gnd
V R = 0V, f = 1MHz
75
pF
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SMS05 THRU SMS24
PROTECTION PRODUCTS
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
Power Derating Curve
110
10
100
% of Rated Power or IPP
Peak Pulse Power - PPP (kW)
90
1
0.1
80
70
60
50
40
30
20
10
0
0.01
0.1
1
10
100
0
1000
25
75
100
125
150
o
Ambient Temperature - TA ( C)
Pulse Duration - tp (µ s)
Pulse Waveform
Clamping Voltage vs. Peak Pulse Current
110
45
Waveform
Parameters:
tr = 8µs
td = 20µs
90
80
70
e
60
-t
50
40
Waveform
Parameters:
tr = 8µs
td = 20µs
40
Clamping Voltage - V C (V)
100
Percent of IPP
50
td = IPP/2
30
20
SMS24
35
30
SMS15
25
SMS12
20
15
SMS05
10
5
10
0
0
0
5
10
15
20
25
0
30
5
10
15
20
25
30
Peak Pulse Current - IPP (A)
Time (µs)
Forward Voltage vs. Forward Current
5
Forward Voltage - V F (V)
4.5
4
3.5
3
2.5
2
1.5
Waveform
Parameters:
tr = 8µs
td = 20µs
1
0.5
0
0
5
10
15
20
25
30
35
40
45
Forward Current - IF (A)
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SMS05 THRU SMS24
PROTECTION PRODUCTS
Applications Information
Device Connection for Protection of Four Data Lines
SMSxx Circuit Diagram
The SMSxx is designed to protect up to four unidirectional data lines. The device is connected as follows:
1. Unidirectional protection of four I/O lines is
achieved by connecting pins 1, 3, 4 and 6 to the
data lines. Pin 2 and 5 are 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.
Protection of Four Unidirectional Lines
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:
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Place the SMSxx near the input terminals or connectors to restrict transient coupling.
Minimize the path length between the SMSxx and
the protected line.
Minimize all conductive loops including power and
ground loops.
The ESD transient return path to ground should be
kept as short as possible.
Never run critical signals near board edges.
Use ground planes whenever possible.
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SMS05 THRU SMS24
PROTECTION PRODUCTS
Outline Drawing
Drawing -- SOT23-6L
SO-8
Outline
Land Pattern - SOT23-6L
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SMS05 THRU SMS24
PROTECTION PRODUCTS
Marking Codes
Par t Numbe r
Mar king
Co d e
SMS05
05/05
SMS12
12/12
SMS15
15/15
SMS24
24/24
Ordering Information
Par t Numbe r
Wo r king
Vo ltage
Qty p e r
Reel
R e e l Size
SMS05.TC
5V
3,000
7 Inch
SMS05.TG
5V
10,000
13 Inch
SMS12.TC
12V
3,000
7 Inch
SMS12.TG
12V
10,000
13 Inch
SMS15.TC
15V
3,000
7 Inch
SMS15.TG
15V
10,000
13 Inch
SMS24.TC
24V
3,000
7 Inch
SMS24.TG
24V
10,000
13 Inch
Note:
(1) No suffix indicates tube pack.
Contact Information
Semtech Corporation
Protection Products Division
652 Mitchell Rd., Newbury Park, CA 91320
Phone: (805)498-2111 FAX (805)498-3804
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