PROTECTION PRODUCTS
1www.semtech.com
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
Bidirectional TVS Array
for Protection of Eight Lines
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)
Small SO-14 surface mount package
Protects eight I/O lines
Working voltages: 5V, 12V, 15V and 24V
Low leakage current
Low operating and clamping voltages
Solid-state silicon avalanche technology
Description Features
Circuit Diagram Schematic & PIN Configuration
Revision 2/25/10
Applications
Mechanical Characteristics
The SMDAxxC-8 series of transient voltage suppres-
sors are designed to protect components which are
connected to data and transmission lines from voltage
surges caused by electrostatic discharge (ESD), electri-
cal fast transients (EFT), 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-8 is designed to provide
transient suppression on multiple data lines and I/O
ports. The low profile SO-14 design allows the user to
protect up to eight data and I/O lines with one pack-
age. They are bidirectional device and may be used on
lines where the normal operating voltage is above and
below ground (i.e. -12V to +12V).
The SMDAxxC-8 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-14 (Top View)
RS-232 and RS-422 Data Lines
Microprocessor Based Equipment
LAN/WAN Equipment
Set-Top Box
Notebooks, Desktops, and Servers
Portable Instrumentation
Peripherals
Serial and Parallel Ports
JEDEC SO-14 package
Molding compound flammability rating: UL 94V-0
Marking : Part Number, Logo, Date Code
Packaging : Tape and Reel
Pb-Free, Halogen Free, RoHS/WEEE Compliant
1
2
3
4
5
6
78
9
10
11
12
13
14
7 & 8
2 3 12 13 5 6 9 10
1 & 14
2© 2010 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
Absolute Maximum Rating
gnitaRlobmySeulaVstinU
t(rewoPesluPkaeP
p
)sμ02/8=P
kp
003sttaW
erutarepmeTgnitarepOT
J
521+ot55-C°
erutarepmeTegarotST
GTS
051+ot55-C°
8-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
t,A1=
p
sμ02/8=8.9V
tnerruCesluPkaePI
PP
t
p
sμ02/8=71A
ecnaticapaCnoitcnuJC
j
dnasniPO/IneewteB
dnuorG
V
R
zHM1=f,V0=
053Fp
8-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
t,A1=
p
sμ02/8=91V
tnerruCesluPkaePI
PP
t
p
sμ02/8=21A
ecnaticapaCnoitcnuJC
j
dnasniPO/IneewteB
dnuorG
V
R
zHM1=f,V0=
021Fp
Electrical Characteristics (T=25oC)
3© 2010 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
8-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
t,A1=
p
sμ02/8=42V
tnerruCesluPkaePI
PP
t
p
sμ02/8=01A
ecnaticapaCnoitcnuJC
j
dnasniPO/IneewteB
dnuorG
V
R
zHM1=f,V0=
57Fp
8-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
t,A1=
p
sμ02/8=34V
tnerruCesluPkaePI
PP
t
p
sμ02/8=5A
ecnaticapaCnoitcnuJC
j
dnasniPO/IneewteB
dnuorG
V
R
zHM1=f,V0=
05Fp
Electrical Characteristics (Continued)
4© 2010 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
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
Tim e (µs)
Percent of IPP
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
Ambie nt Te m pera t ure - TA (oC)
% of Rated Power or I
PP
0.01
0.1
1
10
0.1 1 10 100 1000
Pulse Duratio n - tp (µs)
Peak Pu l se Power - Ppk (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© 2010 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
Circuit Diagram
Connection Diagram
Device Connection for Protection of Eight Data Lines
The SMDAxxC-8 is designed to protect up to 8 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-8 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-8 is designed for a maximum
voltage excursion of ±12V between any two data lines.
The device is connected as follows:
zPins 2, 3, 5, 6, 9, 10, 12 and 13 are connected to
the lines that are to be protected. Pins 1, 7, 8,
and 14 are 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. Pins 4 and 11 are
not connected.
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:
zPlace the TVS near the input terminals or connec-
tors to restrict transient coupling.
zMinimize the path length between the TVS and the
protected line.
zMinimize all conductive loops including power and
ground loops.
zThe ESD transient return path to ground should be
kept as short as possible.
zNever run critical signals near board edges.
zUse ground planes whenever possible.
GND
GND
I/O 1
I/O 2
N.C.
I/O 3
I/O 4
GND
N.C.
GND
I/O 5
I/O 6
I/O 7
I/O 8
1
2
3
4
5
6
78
9
10
11
12
13
14
Applications Information
Matte Tin Lead Finish
Matte tin has become the industry standard lead-free
replacement for SnPb lead finishes. A matte tin finish
is composed of 100% tin solder with large grains.
Since the solder volume on the leads is small com-
pared to the solder paste volume that is placed on the
land pattern of the PCB, the reflow profile will be
determined by the requirements of the solder paste.
Therefore, these devices are compatible with both
lead-free and SnPb assembly techniques. In addition,
unlike other lead-free compositions, matte tin does not
have any added alloys that can cause degradation of
the solder joint.
6© 2010 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
Land Pattern - SO-14
Outline Drawing - SO-14
bxN
2X N/2 TIPS
SEATING
aaa C
E/2
2X
3
A
D
A1
E1
bbb C A-B D
ccc C
A2
PLANE
N
12
AeD
C
B
DETAIL A
c
L
(L1) 01
0.25
GAGE
PLANE
h
h
H
SEE DETAIL A
SIDE VIEW
3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
-B-
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
DATUMS AND TO BE DETERMINED AT DATUM PLANE
NOTES:
1.
2. -A- -H-
REFERENCE JEDEC STD MS-012, VARIATION AB.
4.
.050 BSC
.236 BSC
14
.010
.150
.337 .154
.341
.012 -
14
0.25
1.27 BSC
6.00 BSC
3.90
8.65
-
.157
.344 3.80
8.55
.020 0.31
4.00
8.75
0.51
(.041)
.004
.008
-
.028
-
-
-
-
.016
.007
.049
.004
.053
0.20
0.10
-
0.40
0.17
1.25
0.10
.041
.010
.069
.065
.010 1.35
(1.04)
0.72
-
1.04
0.25
-
-
-1.75
1.65
0.25
0.25
-
.010 .020 0.50
-
L1
ccc
aaa
bbb
01
N
DIM
E1
D
A1
A2
DIMENSIONS
MILLIMETERS
MIN
e
L
h
E
b
c
INCHES
NOMMIN
AMAX MAXNOM
E
ZG
Y
P
(C)
X
THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
NOTES:
1.
REFERENCE IPC-SM-782A, RLP NO. 302A.
2.
.291
.087
.024
.118
(.205)
INCHES
DIMENSIONS
Z
P
Y
X
DIM
C
G
MILLIMETERS
.050
(5.20)
7.40
2.20
0.60
3.00
1.27
7© 2010 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
Ordering Information
rebmuNtraPhsiniFdaeL repytQ
leeR
leeR
eziS
TBT.8-C50ADMSeerFbP005hcni7
TBT.8-C21ADMSeerFbP005hcni7
TBT.8-C51ADMSeerF
bP005hcni7
TBT.8-C42ADMSeerFbP005hcni7
T.8-C50ADMSeerFbPebuT/65A/N
T.8-C21ADMSeerFbPebuT/65A/N
T.8-C51ADMSeerFbPebuT/6
5A/N
T.8-C42ADMSeerFbPebuT/65A/N
Marking
1
SC YYWW
SMDAxxC-8
YYWW = Date Code
Tape and Reel Specification
Device Orientation in Tape
0A0B0K
mm03.0-/+05.6mm03.0-/+05.9mm51.0-/+01.2
epaT
htdiW )xaM(,BD1DE F
K
)XAM( P0P2P)XAM(TW
mm61mm1.21 mm1.0+5.1
)mm0.0-
mm5.0
50.0±
01.±057.1
mmmm01.0±5.7mm5.6 1.0±0.8
mm
1.
0±0.4
mm
10.0±0.2
mm mm4.0
mm0.61
mm3.0±
Top Mark
8© 2010 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
PROTECTION PRODUCTS
SMDA05C-8 through SMDA24C-8
Contact Information
Semtech Corporation
Protection Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804