Datasheet SMDA05C-7TB, SMDA05C-7TE, SMDA12C-7TB, SMDA12C-7TE, SMDA24C-7TB Datasheet (Semtech Corporation)

PROTECTION PRODUCTS

PROTECTION PRODUCTS

SMDA05C-7 THRU SMDA24C-7

Bidirectional TVS Array

for Protection of Seven Lines

Description

The SMDAxxC-7 series of transient voltage suppres­sors 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 SMDAxxC-7 is designed to provide
transient suppression on multiple data lines and I/O
ports. The low profile SO-8 design allows the user to
protect up to seven data and I/O lines with one pack­age.

The SMDAxxC-7 TVS diode array 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 Transient 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) 12A (8/20µs)

u Small SO-8 surface mount package
u Protects seven I/O lines
u Working voltages: 5V, 12V, 15V and 24V
u Low leakage current
u Low operating and clamping voltages
u Solid-state silicon avalanche technology

Mechanical Characteristics

u JEDEC SO-8 package
u Molding compound flammability rating: UL 94V-0
u Marking : Part number, date code, logo
u Packaging : Tube or Tape and Reel per EIA 481

Applications

u RS-232 & RS-422 Data Lines
u Microprocessor Based Equipment
u LAN/WAN Equipment
u Notebooks, Desktops, & Servers
u Instrumentation
u Peripherals
u Set Top Box
u Serial and Parallel Ports

Revision 9/2000

Schematic & PIN Configuration

SO-8 (Top View)

1

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PROTECTION PRODUCTS

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Absolute Maximum Rating

SMDA05C-7 THRU SMDA24C-7

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Electrical Characteristics

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t

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2ã 2000 Semtech Corp.

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PROTECTION PRODUCTS

PROTECTION PRODUCTS

Electrical Characteristics (Continued)

7-C51ADMS

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SMDA05C-7 THRU SMDA24C-7

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7-C42ADMS

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ã 2000 Semtech Corp.

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SMDA05C-7 THRU SMDA24C-7

PROTECTION PRODUCTS

PROTECTION PRODUCTS

Typical Characteristics

Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve

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

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)

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:

ESD Pulse Waveform (IEC 61000-4-2)

tr = 8µs

td = 20µs

IEC 61000-4-2 Discharge Parameters

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4ã 2000 Semtech Corp.

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PROTECTION PRODUCTS

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Applications Information

Device Connection for Protection of Seven Data Lines

The SMDAxxC-7 is designed to protect up to 7 data or
I/O lines. They are bidirectional devices and may be
used on lines where the signal polarities are above and
below ground.

The SMDAxxC-7 TVS arrays employ a monolithic struc­ture. Therefore, the working voltage (V
down voltage (VBR) specifications apply to the differen­tial voltage between any two data line pins. For ex­ample, the SMDA24C-7 is designed for a maximum
voltage excursion of +/-12V between any two data
lines.

) and break-

RWM

SMDA05C-7 THRU SMDA24C-7

Circuit Diagram

The device is connected as follows:

l Pins 1, 2, 3, 4, 5, 6 and 7 are connected to the

lines that are to be protected. Pin 8 is 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.

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 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.

Connection Diagram

DATA IN DATA OUT

678

5

123

DATA IN

4

DATA OUT

ã 2000 Semtech Corp.

5

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Outline Drawing - SO-8

SMDA05C-7 THRU SMDA24C-7

Land Pattern - SO-8

6ã 2000 Semtech Corp.

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Ordering Information

SMDA05C-7 THRU SMDA24C-7

rebmuNtraP

BT.7-C50ADMSV5005hcnI7

ET.7-C50ADMSV5005,2hcnI31

BT.7-C21ADMSV21005hcnI7

ET.7-C21ADMSV21005,2hcnI31

BT.7-C51ADMSV51005hcnI7

ET.7-C51ADMSV51005,2hcnI31

BT.7-C42ADMSV42005hcnI7

ET.7-C42ADMSV42005,2hcnI31

Note:
(1) No suffix indicates tube pack.

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Contact Information

ã 2000 Semtech Corp.

Semtech Corporation

Protection Products Division

652 Mitchell Rd., Newbury Park, CA 91320

Phone: [phone] FAX [phone]

7

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