Semtech LCDA15C-6.TB Low capacitance tvs diode array for multi-mode tranciever protection Datasheet

LCDA15C-6
Low Capacitance TVS Diode Array
For Multi-mode Tranciever Protection
PROTECTION PRODUCTS
Description
Features
The LCDA15C-6 has been specifically designed to
protect sensitive components which are connected to
data and transmission lines from over voltages caused
by electrostatic discharge (ESD), electrical fast transients (EFT), and lightning.
The low capacitance array configuration of the
LCDA15C-6 allows the user to protect six high-speed
data or I/O lines. They may be used on systems
operating from 5 to 15 Volts. The high surge capability
(500W, tp=8/20µs) makes the LCDA15C-6 suitable for
telecommunications systems operating in harsh transient environments. The low inductance construction
minimizes voltage overshoot during high current
surges.
The features of the LCDA15C-6 are ideal for protecting
multi-protocol transceivers in WAN applications such as
Frame Relay systems, routers, and switches.
‹ Transient protection for high-speed 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) 0.5kV, 12A (8/20µs)
Protects six I/O lines
Low capacitance for high-speed interfaces
High surge capability
Low clamping voltage
Solid-state silicon avalanche technology
Mechanical Characteristics
‹
‹
‹
‹
JEDEC SO-8 package
Molding compound flammability rating: UL 94V-0
Marking : Part number, date code, logo
Packaging : Tape and Reel per EIA 481
Applications
‹ Multi-Mode Transceiver Protection
‹ WAN Equipment:
CSU/DSU
Multiplexers
Routers
ISP Equipment
Customer Premise Equipment
‹ Protection for any of the following interfaces:
RS-232 (V.28)
RS-422 (V.11, X.21)
RS-449 (V.11/V.10)
RS-485
Circuit Diagram
Schematic & PIN Configuration
Pin 1
Pin 4 and 5
SO-8 (Top View)
Revision 08/15/06
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LCDA15C-6
PROTECTION PRODUCTS
Absolute Maximum Rating
R ating
Symbol
Value
Units
Peak Pulse Power (tp = 8/20µs)
Pp k
500
Watts
Peak Pulse Current (tp = 8/20µs)
IP P
15
A
Lead Soldering Temp erature
TL
260 (10 sec.)
°C
Op erating Temp erature
TJ
-55 to +125
°C
TSTG
-55 to +150
°C
Storage Temp erature
Electrical Characteristics
LCDA15C-6
Parameter
Symbol
Conditions
Minimum
Typical
Maximum
Units
15
V
Reverse Stand-Off Voltage
VRWM
Reverse Breakdown Voltage
V BR
It= 1mA
Reverse Leakage Current
IR
VRWM = 15V, T=25°C
5
µA
Clamp ing Voltage
VC
IPP = 1A, tp = 8/20µs
Line-to-Ground
24
V
Clamp ing Voltage
VC
IPP = 15A, tp = 8/20µs
Line-to-Ground
33
V
Junction Cap acitance
Cj
Between I/O p ins and
Ground
VR = 0V, f = 1MHz
8
15
pF
Between I/O p ins
VR = 0V, f = 1MHz
3
 2005 Semtech Corp.
2
16.7
V
pF
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LCDA15C-6
PROTECTION PRODUCTS
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
Power Derating Curve
110
10
Peak Pulse Power - Ppk (kW)
100
% of Rated Power or IPP
90
1
0.1
80
70
60
50
40
30
20
10
0.01
0
0.1
1
10
100
0
1000
25
50
Pulse Waveform
100
125
150
175
Clamping Voltage vs. Peak Pulse Current
28
110
Waveform
Parameters:
tr = 8µs
td = 20µs
90
80
70
26
Clamping Voltage - VC (V)
100
Percent of IPP
75
Ambient Temperature - TA (oC)
Pulse Duration - tp (µs)
-t
e
60
50
40
td = IPP/2
30
20
24
22
20
18
16
Waveform
Parameters:
tr = 8µs
td = 20µs
14
12
10
10
0
0
5
10
15
20
25
0
30
2
4
6
8
10
12
14
16
Peak Pulse Current - IPP (A)
Time (µs)
Capacitance vs. Reverse Voltage
Capacitance - Cj (pF)
9
8.5
8
7.5
f=1MHz
Line-to-Ground
7
0
1
2
3
4
5
6
7
8
9
10
11
12
Reverse Voltage - VR (V)
 2005 Semtech Corp.
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LCDA15C-6
PROTECTION PRODUCTS
Applications Information
Device Connection
Device Connection Options for Protection of Six HighSpeed Data Lines
The LCDA15C-6 may be configured to protect up to six
I/O lines operating between 5 and 15V. It may be used
to protect the most popular serial data interface
standard lines making it ideal for use in equipment
utilizing multi-mode transceivers. Data lines are
connected at pins 1, 2, 3, 6, 7, and 8. Pins 4 and 5
are connected to ground. For best results, these pins
should be connected directly to a ground plane on the
board. The path length should be kept as short as
possible to minimize parasitic inductance.
Multi-Mode Transceiver Protection
Multi-Mode Tranceiver Protection Example
A typical multi-mode transceiver protection circuit is
shown. The LCDA15C-6 is used to protect I/O lines
with external connections. The LCDA15C-6 adds a
maximum loading capacitance of 15pF with a working
voltage of 15V. This allows the transceiver to safely
operate in all modes without clipping or degradation of
the signal.
With proper design and layout, the transceiver port can
be protected to >15kV (HBM per IEC 61000-4-2).
Circuit Board Layout Recommendations for Suppression of ESD.
Good circuit board layout is critical for the suppression
of fast rise-time transients such as ESD. The following
guidelines are recommended:
z Place the LCDA15C-6 near the input terminals or
connectors to restrict transient coupling.
z Minimize the path length between the LCDA15C-6
and the protected line.
z Minimize all conductive loops including power and
ground loops.
z The ESD transient return path to ground should be
kept as short as possible.
z Never run critical signals near board edges.
z Use ground planes whenever possible.
 2005 Semtech Corp.
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 compared 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.
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LCDA15C-6
PROTECTION PRODUCTS
Outline Drawing - SO-8
A
h
D
e
N
h
H
2X E/2
E1 E
1
0.25
L
(L1)
e/2
DETAIL
B
01
A
D
aaa C
SEATING
PLANE
A2 A
C
SEE DETAIL
A
.053
.069
.010
.004
.065
.049
.012
.020
.010
.007
.189 .193 .197
.150 .154 .157
.236 BSC
.050 BSC
.010
.020
.016 .028 .041
(.041)
8
8°
0°
.004
.010
.008
1.35
1.75
0.10
0.25
1.25
1.65
0.31
0.51
0.17
0.25
4.80 4.90 5.00
3.80 3.90 4.00
6.00 BSC
1.27 BSC
0.25
0.50
0.40 0.72 1.04
(1.04)
8
0°
8°
0.10
0.25
0.20
SIDE VIEW
A1
bxN
bbb
DIMENSIONS
INCHES
MILLIMETERS
MIN NOM MAX MIN NOM MAX
A
A1
A2
b
c
D
E1
E
e
h
L
L1
N
01
aaa
bbb
ccc
c
GAGE
PLANE
2
ccc C
2X N/2 TIPS
DIM
C A-B D
NOTES:
1.
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
4. REFERENCE JEDEC STD MS-012, VARIATION AA.
Land Pattern - SO-8
X
DIM
(C)
G
C
G
P
X
Y
Z
Z
Y
DIMENSIONS
INCHES
MILLIMETERS
(.205)
.118
.050
.024
.087
.291
(5.20)
3.00
1.27
0.60
2.20
7.40
P
NOTES:
1.
THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
2. REFERENCE IPC-SM-782A, RLP NO. 300A.
 2005 Semtech Corp.
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LCDA15C-6
PROTECTION PRODUCTS
Ordering Information
Part Number
Lead Finish
Qty per Reel
Reel Size
LCDA15C-6.TB
SnPb
500
7 Inch
LCDA15.C-6TBT
Pb Free
500
7 inch
SnPb
95/Tube
N/A
Pb Free
95/Tube
N/A
LCDA15C-6
LCDA15C-6.T
Note: Lead-free devices are RoHS/WEEE Compliant
Contact Information
Semtech Corporation
Protection Products Division
200 Flynn Rd., Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
 2005 Semtech Corp.
6
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