Datasheet SM05TC, SM05TG, SM12TC, SM12TG, SM15TC Datasheet (Semtech Corporation)

PROTECTION PRODUCTS

SM05 THRU SM36

TVS Diode Array

Description

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.

Features

u 300 watts peak pulse power (tp = 8/20µs)
u Transient 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)

u Protects one bidirectional line or two unidirectional

lines

u Working Voltages: 5V, 12V, 15V, 24 and 36V
u Low clamping voltage
u Solid-state silicon avalanche technology

Mechanical Characteristics

u JEDEC SOT23 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 and Accessories
u Portable Electronics
u Industrial Controls
u Set-Top Box
u Servers, Notebook, and Desktop PC

Circuit Diagram Schematic & PIN Configuration

SOT23 (Top View)

Revision 9/2000

1

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Absolute Maximum Rating

SM05 THRU SM36

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Electrical Characteristics

50MS

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V

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Am1=6 V

t

I

,A1=

PP

q

AJ

L

J

GTS

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521+ot55-C°

051+ot55-C°

5V

8.9V

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pp

j

j

V

R

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21MS

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Am1=3.31V

t

C°52=T,V21=1Aµ

I

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21V

91V

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2ã 2000 Semtech Corp.

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Electrical Characteristics (Continued)

51MS

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I

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C

pp

j

j

V

MWR

I

PP

V

R

V

R

Am1=7.61V

t

C°52=T,V51=1Aµ

sµ02/8=pt,A1=42V

sµ02/8=pt01A

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51V

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42MS

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Am1=7.62V

t

C°52=T,V42=1Aµ

sµ02/8=pt,A1=34V

42V

63MS

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ã 2000 Semtech Corp.

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V

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Am1=04V

t

C°52=T,V63=1Aµ

sµ02/8=pt,A1=06V

sµ02/8=pt4A

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3

63V

04Fp

54Fp

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Typical Characteristics

SM05 THRU SM36

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)

Pulse Waveform

110
100

90
80
70

PP

60
50
40

Percent of I

30
20
10

0

0 5 10 15 20 25 30

-t

e

Time (µs)

td = IPP/2

Waveform

Parameters:

tr = 8µs

td = 20µs

Power Derating Curve

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

Ambient Temperature - T

A

(oC)

ESD Pulse Waveform (Per IEC 61000-4-2)

IEC 61000-4-2 Discharge Parameters

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4ã 2000 Semtech Corp.

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Applications Information

SM05 THRU SM36

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:

l Bidirectional: Pin 1 is connected to the data line

and pin 2 is connected to ground (Since the device
is symmetrical, these connections may be re­versed). 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.

l Unidirectional: 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 Suppres­sion of ESD.

Device Schematic & Pin Configuration

RS-232 Transceiver Protection Example

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):

l Place the TVS near the input terminals or connec-

tors to restrict transient coupling.

l Minimize the path length between the TVS 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.

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Outline Drawing - SOT23

SM05 THRU SM36

Land Pattern - 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.

6ã 2000 Semtech Corp.

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Marking Codes

SM05 THRU SM36

rebmuNtraP

50MS50M

21MS21M

51MS51M

42MS42M

63MS63M

edoC

Ordering Information

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CT.50MSV5000,3hcnI7

GT.50MSV5000,01hcnI31

CT.21MSV21000,3hcnI7

GT.21MSV21000,01hcnI31

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CT.51MSV51000,3hcnI7

GT.51MSV51000,01hcnI31

CT.42MSV42000,3hcnI7

GT.42MSV42000,01hcnI31

CT.63MSV63000,3hcnI7

Contact Information

Semtech Corporation

Protection Products Division

652 Mitchell Rd., Newbury Park, CA 91320

Phone: [phone] FAX [phone]

ã 2000 Semtech Corp.

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