Datasheet SLVE2.8.TC, SLVG2.8.TC Datasheet (Semtech Corporation)

PROTECTION PRODUCTS

1

www.semtech.com

PROTECTION PRODUCTS

SLVE2.8 & SLVG2.8

EPD TVS

™™

™™

™ Diodes For

ESD and Latch-Up Protection

Description

Features

Schematic & Pin Configuration Schematic & PIN Configuration

Revision 1/18/2001

The SLV series of transient voltage suppressors are
designed to protect low voltage, state-of-the-art CMOS
semiconductors from transients caused by electro­static discharge (ESD), cable discharge events (CDE),
lightning and other induced voltage surges.

The devices are constructed using Semtech’s propri­etary EPD process technology. The EPD process pro­vides low standoff voltages with significant reductions
in leakage currents and capacitance over silicon­avalanche diode processes. The SLVE2.8 & SLVG2.8
are in a SOT-143 package and have a low 2.8V work­ing voltage. They may be used to protect one line in
differential or common mode. The “flow-thru” design
minimizes trace inductance and reduces voltage
overshoot associated with ESD events.

The SLV is specifically designed to protect low voltage
components such as Ethernet transceivers, laser
diodes, ASICs, and high-speed RAM. The low clamping
voltage of the SLV minimizes the stress on the pro­tected IC.

The SLV series T VS diodes will exceed the surge re­quirements of IEC 61000-4-2, Level 4.

Applications

Mechanical Characteristics

! ESD and Latch-up Protection
! Analog Inputs
! WAN/LAN Equipment
! Low Voltage ASICs
! Desktops, Servers, Notebooks & Handhelds
! Portable Instrumentation
! Base Stations
! Laser Diode Protection

! 300 Watts peak pulse power (tp = 8/20µs)
! Transient protection for low voltage data 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) 24A (tp = 8/20µs)

! Protects one line
! Comprehensive pin out for easy board layout
! Low capacitance
! Low leakage current
! Low operating and clamping voltages
! Solid-state EPD TVS process technology

! JEDEC SOT-143 package
! Molding compound flammability rating: UL 94V-0
! Marking : Marking code
! Packaging : Tape and Reel per EIA 481

SLVE2.8 (Top View)

1

2

3

4

1

2

3

4

SLVG2.8 (Top View)

2 2001 Semtech Corp.

www.semtech.com

PROTECTION PRODUCTS

PROTECTION PRODUCTS

SLVE2.8 & SLVG2.8

Absolute Maximum Rating

Electrical Characteristics

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3 2001 Semtech Corp.

www.semtech.com

PROTECTION PRODUCTS

SLVE2.8 & SLVG2.8

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 - T

A

(oC)

% of Rated Power or I

PP

Power Derating Curve

Pulse Waveform Clamping Voltage vs. Peak Pulse Current

0

10

20

30

40

50

60

70

80

90

100

110

0 5 10 15 20 25 30

Time (µµµµs)

Percent of I

PP

e

-t

td = IPP/2

Waveform

Parameters:

tr = 8µs

td = 20µs

0.01

0.1

1

10

0.1 1 10 100 1000

Pulse Duration - tp (µµµµs)

Peak Pulse Power - P

PP

(kW)

0

2

4

6

8

10

12

14

16

18

0 5 10 15 20 25 30 35

Peak Pulse Current - I

PP

(A)

Clamping Voltage - V

C

(V)

SLVG2.8

SLVE2.8

Waveform

Parameters:

tr = 8µs

td = 20µs

4 2001 Semtech Corp.

www.semtech.com

PROTECTION PRODUCTS

PROTECTION PRODUCTS

SLVE2.8 & SLVG2.8

Circuit Diagrams

Common Mode Protection (SLVE2.8 & SLVG2.8)

Device Connection

Electronic equipment is susceptible to transient distur­bances from a variety of sources including: ESD to an
open connector or interface, direct or nearby lightning
strikes to cables and wires, and charged cables “hot
plugged” into I/O ports. The SLV series is designed to
protect sensitive components from damage and latch­up which may result from such transient events. The
SLVG2.8 is designed to protect one unidirectional line
while the SLVE2.8 is designed to protect one bidirec­tional line (or two differential lines). The options for
connecting the devices are as follows:

" SLVE2.8: Common mode protection of one bidirec-

tional data line is achieved by connecting the data
line input/output at pins 2 and 3. Pins 1 and 4 are
connected to ground. For differential protection,
pins 1 & 4 can be connected to a second I/O line.
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.

" SLVG2.8: Common mode protection of one unidi-

rectional line is achieved by connecting the line to
be protected at pins 2 & 3. Pins 1 & 4 are con­nected to ground. 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.

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:

" Place the TVS near the input terminals or connec-

tors to restrict transient coupling.

" Minimize the path length between the TVS and the

protected line.

" Minimize all conductive loops including power and

ground loops.

" The ESD transient return path to ground should be

kept as short as possible.

" Never run critical signals near board edges.
" Use ground planes whenever possible.

1

2

3

4

Line
In

Line
Out

1

2

3

4

Line 2
In

Line 2
Out

Line 1
In

Line 1
Out

Differential Mode Protection (SLVE2.8 only)

1

2

3

4

1

2

3

4

SLVG2.8 SLVE2.8

Applications Information

5 2001 Semtech Corp.

www.semtech.com

PROTECTION PRODUCTS

SLVE2.8 & SLVG2.8

Applications Information (continued)

I

PP

I

SB

I

PT

I

R

V

RWMVVPTVC

V

BRR

I

BRR

SB

EPD TVS VI Characteristic Cur ve

EPD TVS

™ Characteristics

The SLV series is constructed using Semtech’s propri­etary EPD technology. The structure of the EPD TVS is
vastly different from the traditional pn-junction devices.
At voltages below 5V, high leakage current and junction
capacitance render conventional avalanche technology
impractical for most applications. However, by utilizing
the EPD technology, the SLVE2.8 & SLVG2.8 can
effectively operate at 2.8V while maintaining excellent
electrical characteristics.

The EPD TVS employs a complex nppn structure in
contrast to the pn structure normally found in tradi­tional silicon-avalanche TVS diodes. The EPD mecha­nism is achieved by engineering the center region of
the device such that the reverse biased junction does
not avalanche, but will “punch-through” to a conduct­ing state. This structure results in a device with supe­rior dc electrical parameters at low voltages while
maintaining the capability to absorb high transient
currents.

The IV characteristic curve of the EPD device is shown
in Figure 1. The device represents a high impedance
to the circuit up to the working voltage (V

RWM

). During a
transient event, the device will begin to conduct as it is
biased in the reverse direction. When the punch­through voltage (VPT) is exceeded, the device enters a
low impedance state, diverting the transient current
away from the protected circuit. When the device is
conducting current, it will exhibit a slight “snap-back” or
negative resistance characteristic due to its structure.
This must be considered when connecting the device
to a power supply rail. To return to a non-conducting
state, the current through the device must fall below
the snap-back current (approximately < 50mA).

6 2001 Semtech Corp.

www.semtech.com

PROTECTION PRODUCTS

PROTECTION PRODUCTS

SLVE2.8 & SLVG2.8

Land Pattern - SOT-143

Notes:
(1) Controlling dimension: Millimeters.
(2) Dimension A and B do not include mold protrusions.
Mold protrusions are .006” max.

Outline Drawing - SOT-143

7 2001 Semtech Corp.

www.semtech.com

PROTECTION PRODUCTS

SLVE2.8 & SLVG2.8

Contact Information

Semtech Corporation

Protection Products Division

652 Mitchell Rd., Newbury Park, CA 91320

Phone: [phone] FAX [phone]

Marking Codes

Ordering Information

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CT.8.2EVLSV8.2000,3hcnI7
CT.8.2GVLSV8.2000,3hcnI7

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8.2EVLS8.2E

8.2GVLS8.2G

Note: Consult factory for availability of 13” reelsNote: Consult factory for availability of 13” reels

Note: Consult factory for availability of 13” reelsNote: Consult factory for availability of 13” reels

Note: Consult factory for availability of 13” reels