1www.semtech.com
PROTECTION PRODUCTS
SMS05C THRU SMS24C
TVS Diode Array
For ESD and Latch-Up Protection
uTransient protection for data lines to
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)
uSmall package for use in portable electronics
uProtects five I/O lines
uWorking voltages: 5V, 12V, 15V and 24V
uLow leakage current
uLow operating and clamping voltages
uSolid-state silicon avalanche technology
Description Features
Circuit Diagram Schematic & PIN Configuration
Revision 9/2000
Applications
Mechanical Characteristics
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 five 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 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 degrada-
tion.
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.
SOT23-6L (Top View)
uEIAJ SOT23-6L package
uMolding compound flammability rating: UL 94V-0
uMarking : Marking Code
uPackaging : Tape and Reel per EIA 481
uCell phone Handsets and Accessories
uMicroprocessor Based Equipment
uPersonal Digital Assistants (PDAs)
uNotebooks, Desktops, and Servers
uPortable Instrumentation
uSet Top Box
uPeripherals
uMP3 Players
uCordless Phones
2ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SMS05C THRU SMS24C
Absolute Maximum Rating
Electrical Characteristics
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PF
5.1V
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C50SMS
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MWR
5V
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RB
I
t
Am1=6 V
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R
V
MWR
C°52=T,V5=02Aµ
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C
I
PP
sµ02/8=pt,A5=8.9V
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C
I
PP
sµ02/8=pt,A42=5.41V
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j
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V
R
zHM1=f,V0=
523004Fp
C21SMS
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MWR
21V
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RB
I
t
Am1=3.31V
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R
V
MWR
C°52=T,V21=1Aµ
egatloVgnipmalCV
C
I
PP
sµ02/8=pt,A5=91V
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C
I
PP
sµ02/8=pt,A51=32V
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R
zHM1=f,V0=
531051Fp
3
ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SMS05C THRU SMS24C
C51SMS
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MWR
51V
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RB
I
t
Am1=7.61V
tnerruCegakaeLesreveRI
R
V
MWR
C°52=T,V51=1Aµ
egatloVgnipmalCV
C
I
PP
sµ02/8=pt,A5=42V
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C
I
PP
sµ02/8=pt,A21=92V
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dnG
V
R
zHM1=f,V0=
001521Fp
Electrical Characteristics (Continued)
C42SMS
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42V
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RB
I
t
Am1=7.62V
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R
V
MWR
C°52=T,V42=1Aµ
egatloVgnipmalCV
C
I
PP
sµ02/8=pt,A5=04V
egatloVgnipmalCV
C
I
PP
sµ02/8=pt,A8=44V
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dnasniPO/IneewteB
dnG
V
R
zHM1=f,V0=
0657Fp
4ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SMS05C THRU SMS24C
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve
0
10
20
30
40
50
60
70
80
90
100
110
0 5 10 15 20 25 30
Time (µs)
Percent of I
PP
e-t
td = IPP/2
Waveform
Parameters:
tr = 8µs
td = 20µs
Pulse Waveform
Forward Voltage vs. Forward Current
0
10
20
30
40
50
60
70
80
90
100
110
0 25 50 75 100 125 150
Ambient Temperature - TA (oC)
% of Rated P ower or I
PP
0
5
10
15
20
25
30
35
40
45
0 5 10 15 20 25 30
Peak Pu lse Current - I PP (A)
Clamping Voltage - V
C
(V)
SMS12C
SMS05C
Waveform
Parameters:
tr = 8µs
td = 20
µ
s
SMS15C
SMS24C
Clamping Voltage vs. Peak Pulse Current
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0 5 10 15 20 25 30 35 40 45
Forward Current - IF (A)
Forward Voltage - V
F
(V)
Waveform
Parameters:
tr = 8µs
td = 20
µ
s
0.01
0.1
1
10
0.1 1 10 100 1000
Pul se Durat i o n - tp (µs)
Peak Pulse P o wer - P
PP
(kW)
5
ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SMS05C THRU SMS24C
SMSxxC Circuit Diagram
Protection of Five Unidirectional Lines
Device Connection for Protection of Five Data Lines
The SMSxxC is designed to protect up to five unidirec-
tional 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 Suppres-
sion of ESD.
Good circuit board layout is critical for the suppression
of ESD induced transients. The following guidelines are
recommended:
lPlace the SMSxxC near the input terminals or
connectors to restrict transient coupling.
lMinimize the path length between the SMSxxC and
the protected line.
lMinimize all conductive loops including power and
ground loops.
lThe ESD transient return path to ground should be
kept as short as possible.
lNever run critical signals near board edges.
lUse ground planes whenever possible.
Applications Information
6ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SMS05C THRU SMS24C
Outline Drawing - SO-8
Land Pattern - SOT23-6L
Outline Drawing - SOT23-6L
7
ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SMS05C THRU SMS24C
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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CT.C50SMSV5000,3hcnI7
GT.C50SMSV5000,01hcnI31
CT.C21SMSV21000,3hcnI7
GTC21SMSV21000,01hcnI31
CT.C51SMSV51000,3hcnI7
GT.C51SMSV51000,01hcnI31
CT.C42SMSV42000,3hcnI7
GT.C42SMSV42000,01hcnI31
Note:
(1) No suffix indicates tube pack.
Ordering Information
Marking Codes
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edoC
C50SMS50C
C21SMS21C
C51SMS51C
C42SMS42C
Note:
Pin 1 Identified with a dot.