PROTECTION PRODUCTS
1www.semtech.com
PROTECTION PRODUCTS
SMDA05C-7 THRU SMDA24C-7
Bidirectional TVS Array
for Protection of Seven Lines
uTransient 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)
uSmall SO-8 surface mount package
uProtects seven I/O lines
uWorking voltages: 5V, 12V, 15V and 24V
uLow leakage current
uLow operating and clamping voltages
uSolid-state silicon avalanche technology
Description Features
Schematic & PIN Configuration
Revision 9/2000
Applications
Mechanical Characteristics
The SMDAxxC-7 series of transient voltage suppres-
sors 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 pack-
age.
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.
SO-8 (Top View)
uJEDEC SO-8 package
uMolding compound flammability rating: UL 94V-0
uMarking : Part number, date code, logo
uPackaging : Tube or Tape and Reel per EIA 481
uRS-232 & RS-422 Data Lines
uMicroprocessor Based Equipment
uLAN/WAN Equipment
uNotebooks, Desktops, & Servers
uInstrumentation
uPeripherals
uSet Top Box
uSerial and Parallel Ports
2ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-7 THRU SMDA24C-7
Absolute Maximum Rating
Electrical Characteristics
gnitaRlobmySeulaVstinU
)sµ02/8=pt(rewoPesluPkaePP
kp
003sttaW
erutarepmeTgniredloSdaeLT
L
).ces01(062C°
erutarepmeTgnitarepOT
J
521+ot55-C°
erutarepmeTegarotST
GTS
051+ot55-C°
7-C50ADMS
retemaraPlobmySsnoitidnoCmuminiMlacipyTmumixaMstinU
egatloVffO-dnatSesreveRV
MWR
5V
egatloVnwodkaerBesreveRV
RB
I
t
Am1=6 V
tnerruCegakaeLesreveRI
R
V
MWR
C°52=T,V5=02Aµ
egatloVgnipmalCV
C
I
PP
sµ02/8=pt,A1=8.9V
tnerruCesluPkaePmumixaMI
PP
sµ02/8=pt71A
ecnaticapaCnoitcnuJC
j
dnasniPO/IneewteB
dnG
V
R
zHM1=f,V0=
053Fp
7-C21ADMS
retemaraPlobmySsnoitidnoCmuminiMlacipyTmumixaMstinU
egatloVffO-dnatSesreveRV
MWR
21V
egatloVnwodkaerBesreveRV
RB
I
t
Am1=3.31V
tnerruCegakaeLesreveRI
R
V
MWR
C°52=T,V21=1Aµ
egatloVgnipmalCV
C
I
PP
sµ02/8=pt,A1=91V
tnerruCesluPkaePmumixaMI
PP
sµ02/8=pt21A
ecnaticapaCnoitcnuJC
j
dnasniPO/IneewteB
dnG
V
R
zHM1=f,V0=
021Fp
3
ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-7 THRU SMDA24C-7
7-C51ADMS
retemaraPlobmySsnoitidnoCmuminiMlacipyTmumixaMstinU
egatloVffO-dnatSesreveRV
MWR
51V
egatloVnwodkaerBesreveRV
RB
I
t
Am1=7.61V
tnerruCegakaeLesreveRI
R
V
MWR
C°52=T,V51=1Aµ
egatloVgnipmalCV
C
I
PP
sµ02/8=pt,A1=42V
tnerruCesluPkaePmumixaMI
PP
sµ02/8=pt01A
ecnaticapaCnoitcnuJC
j
dnasniPO/IneewteB
dnG
V
R
zHM1=f,V0=
57Fp
7-C42ADMS
retemaraPlobmySsnoitidnoCmuminiMlacipyTmumixaMstinU
egatloVffO-dnatSesreveRV
MWR
42V
egatloVnwodkaerBesreveRV
RB
I
t
Am1=7.62V
tnerruCegakaeLesreveRI
R
V
MWR
C°52=T,V42=1Aµ
egatloVgnipmalCV
C
I
PP
sµ02/8=pt,A1=34V
tnerruCesluPkaePmumixaMI
PP
sµ02/8=pt5A
ecnaticapaCnoitcnuJC
j
dnasniPO/IneewteB
dnG
V
R
zHM1=f,V0=
05Fp
Electrical Characteristics (Continued)
4ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-7 THRU SMDA24C-7
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve
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
Pulse Waveform
ESD Pulse Waveform (IEC 61000-4-2)
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
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
leveLtsriF
kaeP
tnerruC
)A(
kaeP
tnerruC
sn03ta
)A(
kaeP
tnerruC
sn06ta
)A(
tseT
egatloV
tcatnoC(
)egrahcsiD
)Vk(
tseT
egatloV
riA(
)egrahcsiD
)Vk(
15.748 2 2
25184 4 4
35.222166 8
403618 8 51
5
ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-7 THRU SMDA24C-7
Circuit Diagram
Connection Diagram
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 struc-
ture. Therefore, the working voltage (VRWM) and break-
down voltage (VBR) specifications apply to the differen-
tial voltage between any two data line pins. For ex-
ample, the SMDA24C-7 is designed for a maximum
voltage excursion of +/-12V between any two data
lines.
The device is connected as follows:
lPins 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 Suppres-
sion of ESD.
Good circuit board layout is critical for the suppression
of ESD induced transients. The following guidelines are
recommended:
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.
1234
5
678
DATA IN DATA OUT
DATA IN DATA OUT
Applications Information
6ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-7 THRU SMDA24C-7
Land Pattern - SO-8
Outline Drawing - SO-8
7
ã 2000 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-7 THRU SMDA24C-7
Contact Information
Semtech Corporation
Protection Products Division
652 Mitchell Rd., Newbury Park, CA 91320
Phone: (805)498-2111 FAX (805)498-3804
rebmuNtraP gnikroW
egatloV
repytQ
leeR eziSleeR
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.
Ordering Information
