1www.semtech.com
PROTECTION PRODUCTS
SM05 THRU SM36
TVS Diode Array
Description Features
Circuit Diagram Schematic & PIN Configuration
Revision 9/2000
The SM series of transient voltage suppressors (TVS)
are 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-anode design
allows the user to protect one bidirectional data line or
two unidirectional lines. The low profile SOT23
package allows flexibility in the design of crowded
circuit boards.
The SM series 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
uCellular Handsets and Accessories
uPortable Electronics
uIndustrial Controls
uSet-Top Box
uServers, Notebook, and Desktop PC
u300 watts peak pulse power (tp = 8/20µs)
uTransient protection for data & power lines to
IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact)
IEC 61000-4-4 (EFT) 40A (tp=5/50ns)
IEC 61000-4-5 (Lightning) 12A (tp=1.2/50µs)
uProtects one bidirectional line or two unidirectional
lines
uWorking Voltages: 5V, 12V, 15V, 24 and 36V
uLow clamping voltage
uSolid-state silicon avalanche technology
uJEDEC SOT23 package
uMolding compound flammability rating: UL 94V-0
uMarking : Marking Code
uPackaging : Tape and Reel per EIA 481
SOT23 (Top View)
2ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SM05 THRU SM36
Absolute Maximum Rating
Electrical Characteristics
50MS
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8.9V
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21MS
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21V
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3
ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SM05 THRU SM36
Electrical Characteristics (Continued)
51MS
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51V
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V
MWR
C°52=T,V51=1Aµ
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PP
sµ02/8=pt,A1=42V
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57Fp
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zHM1=f,V0=
001Fp
42MS
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42V
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R
V
MWR
C°52=T,V42=1Aµ
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C
I
PP
sµ02/8=pt,A1=34V
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sµ02/8=pt5A
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63MS
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63V
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V
MWR
C°52=T,V63=1Aµ
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C
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sµ02/8=pt,A1=06V
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sµ02/8=pt4A
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zHM1=f,V0=
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4ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SM05 THRU SM36
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 - TA (oC)
% of Rated Power or I
PP
Power Derating Curve
Pulse Waveform
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
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15.748 2 2
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35.222166 8
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0.01
0.1
1
10
0.1 1 10 100 1000
Pulse Duration - tp (µs)
Peak Pulse Power - P
PP
(kW)
IEC 61000-4-2 Discharge Parameters
ESD Pulse Waveform (Per IEC 61000-4-2)
5
ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SM05 THRU SM36
Applications Information
Device Schematic & Pin Configuration
Device Connection Options
The SM series is designed to protect one bidirectional
or two unidirectional data or I/O lines operating at 5 to
36 volts. Connection options are as follows:
lBidirectional: Pin 1 is connected to the data line
and pin 2 is connected to ground (Since the device
is symmetrical, these connections may be re-
versed). For best results, the ground connection
should be made 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.
lUnidirectional: Data lines are connected to pin 1
and pin 2. Pin 3 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.
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 (Refer to application note
SI99-01 for more detailed information):
lPlace the TVS near the input terminals or connec-
tors to restrict transient coupling.
lMinimize the path length between the TVS 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.
RS-232 Transceiver Protection Example
6ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SM05 THRU SM36
Land Pattern - SOT23
Outline Drawing - 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.
7
ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SM05 THRU SM36
Contact Information
Semtech Corporation
Protection Products Division
652 Mitchell Rd., Newbury Park, CA 91320
Phone: (805)498-2111 FAX (805)498-3804
Ordering Information
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CT.50MSV5000,3hcnI7
GT.50MSV5000,01hcnI31
CT.21MSV21000,3hcnI7
GT.21MSV21000,01hcnI31
CT.51MSV51000,3hcnI7
GT.51MSV51000,01hcnI31
CT.42MSV42000,3hcnI7
GT.42MSV42000,01hcnI31
CT.63MSV63000,3hcnI7
Marking Codes
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edoC
50MS50M
21MS21M
51MS51M
42MS42M
63MS63M
