Datasheet SMF12TC, SMF12TG, SMF05TC, SMF05TG Datasheet (Semtech Corporation)

PROTECTION PRODUCTS

PROTECTION PRODUCTS

SMF05 AND SMF12

TVS Diode Array

For ESD and Latch-Up Protection

Description

The SMF series TVS arrays are designed to protect sen­sitive electronics from damage or latch-up due to ESD
and other voltage-induced transient events. They are
designed for use in applications where board space is at
a premium. Each device will protect up to four lines.
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 degradation.

The SMF series devices may be used to meet the immu­nity requirements of IEC 61000-4-2, level 4. The small
SC70 package makes them ideal for use in portable elec­tronics such as cell phones, PDAs, notebook comput­ers, and digital cameras.

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)

u Small package for use in portable electronics
u Protects four I/O lines
u Working voltage: 5V & 12V
u Low leakage current
u Low operating and clamping voltages
u Solid-state silicon-avalanche technology

Mechanical Characteristics

u EIAJ SC70-5L 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 & Accessories
u Cordless Phones
u Personal Digital Assistants (PDAs)
u Notebooks & Handhelds
u Portable Instrumentation
u Digital Cameras
u Peripherals
u MP3 Players

Circuit Diagram Schematic & PIN Configuration

1345

1

2

34

2

SC70-5L (Top View)

Revision 9/2000

1

5

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PROTECTION PRODUCTS

Absolute Maximum Rating

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SMF05 & SMF12

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Electrical Characteristics

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GTS

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2ã 2000 Semtech Corp.

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PROTECTION PRODUCTS

µ

Typical Characteristics

SMF05 & SMF12

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 Clamping Voltage vs. Peak Pulse Current

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

30

25

(V)

C

20

15

10

Clamping Voltage - V

5

0

0 2 4 6 8 10121416

Peak Pulse Current - I

SMF12

A

PP

(oC)

SMF05

Waveform

Parameters:

td = 20

(A)

tr = 8µs

s

SMF05 ESD Clamping

(8kV Contact per IEC 61000-4-2)

ã 2000 Semtech Corp.

3

SMF12 ESD Clamping

(8kV Contact per IEC 61000-4-2)

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PROTECTION PRODUCTS

Applications Information

SMF05 & SMF12

Device Connection for Protection of Four Data Lines

The SMFxx 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 5 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 Suppres­sion of ESD.

Good circuit board layout is critical for the suppression
of ESD induced transients. The following guidelines are
recommended:

l Place the SMFxx near the input terminals or con-

nectors to restrict transient coupling.

l Minimize the path length between the SMSxx 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.

SMF Circuit Diagram

1345

2

Protection of Four Unidirectional Lines

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PROTECTION PRODUCTS

Typical Applications

SMF05 & SMF12

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PROTECTION PRODUCTS

Outline Drawing - SC70-5L

SMF05 & SMF12

Land Pattern - SC70-5L

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PROTECTION PRODUCTS

Marking Codes

SMF05 & SMF12

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50FMS50F

21FMS21F

Note:
(1) Pin 1 Identified with a dot

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Ordering Information

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CT.50FMSV5000,3hcnI7

GT.50FMSV5000,01hcnI31

CT.21FMSV21000,3hcnI7

GT.21FMSV21000,01hcnI31

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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

www.semtech.com