Semtech LCDA15.TB Low capacitance tvs diode array for high-speed data interface Datasheet

LCDA05 through LCDA24
Low Capacitance TVS Diode Array
For High-Speed Data Interfaces
PROTECTION PRODUCTS
Description
Features
The LCDA series of TVS arrays are designed to protect
sensitive electronics from damage or latch-up due to
ESD and other voltage-induced transient events. Each
device will protect two high-speed lines. They are
available with operating voltages of 5V, 12V, 15V and
24V. They are bidirectional devices and may be used on
lines where the signal polarities are above and below
ground.
TVS diodes are solid-state devices designed specifically
for transient suppression. They offer desirable characteristics for board level protection including fast response time, low operating and clamping voltage and
no device degradation. The LCDA series devices
feature low capacitance compensation diodes in series
with standard TVS diodes to provide an integrated, low
capacitance solution for use on high-speed interfaces.
The LCDA series devices may be used to meet the
immunity requirements of IEC 61000-4-2, level 4.
‹ 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) (8/20µs)*
Protects two I/O lines
Low capacitance for high-speed data lines
Working voltages: 5V, 12V, 15V and 24V
Low leakage current
Low operating and clamping voltages
Solid-state silicon avalanche technology
Mechanical Characteristics
‹
‹
‹
‹
JEDEC SO-8 package
Molding compound flammability rating: UL 94V-0
Marking : Part Number, Date Code
Packaging : Tape and Reel per EIA 481
Applications
‹
‹
‹
‹
‹
‹
‹
High-Speed Data Lines
Microprocessor Based Equipment
Universal Serial Bus (USB) Port Protection
Notebooks, Desktops, and Servers
Instrumentation
LAN/WAN Equipment
Peripherals
*See Electrical Characteristics Tables for Ipp
Circuit Diagram (Each Line Pair)
Schematic & PIN Configuration
Pin 1 and 2
1
8
2
7
3
6
4
5
Pin 7 and 8
SO-8 (Top View)
Revision 08/15/2006
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LCDA05 through LCDA24
PROTECTION PRODUCTS
Absolute Maximum Rating
R ating
Symbol
Value
Units
Peak Pulse Power (tp = 8/20µs)
Pp k
300
Watts
Lead Soldering Temperature
TL
260 (10 sec.)
°C
Operating Temperature
TJ
-55 to +125
°C
TSTG
-55 to +150
°C
Storage Temperature
Electrical Characteristics
LCDA05
Parameter
Symbol
Conditions
Minimum
Typical
Maximum
Units
5
V
Reverse Stand-Off Voltage
VRWM
Reverse Breakdown Voltage
V BR
It = 1mA
Reverse Leakage Current
IR
VRWM = 5V, T=25°C
20
µA
Clamp ing Voltage
VC
IPP = 1A, tp = 8/20µs
9.8
V
Clamp ing Voltage
VC
IPP = 5A, tp = 8/20µs
11
V
Maximum Peak Pulse Current
IP P
tp = 8/20µs
17
A
Junction Cap acitance
Cj
Between I/O Pins and
Ground
VR = 0V, f = 1MHz
5
pF
Symbol
Conditions
Maximum
Units
12
V
6
V
LCDA12
Parameter
Minimum
Typical
Reverse Stand-Off Voltage
VRWM
Reverse Breakdown Voltage
V BR
It = 1mA
Reverse Leakage Current
IR
VRWM = 12V, T=25°C
1
µA
Clamp ing Voltage
VC
IPP = 1A, tp = 8/20µs
19
V
Clamp ing Voltage
VC
IPP = 5A, tp = 8/20µs
24
V
Maximum Peak Pulse Current
IP P
tp = 8/20µs
12
A
Junction Cap acitance
Cj
Between I/O Pins and
Ground
VR = 0V, f = 1MHz
5
pF
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LCDA05 through LCDA24
PROTECTION PRODUCTS
Electrical Characteristics (continued)
LCDA15
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
1
µA
Clamp ing Voltage
VC
IPP = 1A, tp = 8/20µs
24
V
Clamp ing Voltage
VC
IPP = 5A, tp = 8/20µs
30
V
Maximum Peak Pulse Current
IP P
tp = 8/20µs
10
A
Junction Cap acitance
Cj
Between I/O Pins and
Ground
VR = 0V, f = 1MHz
5
pF
Symbol
Conditions
Maximum
Units
24
V
16.7
V
LCDA24
Parameter
Minimum
Typical
Reverse Stand-Off Voltage
VRWM
Reverse Breakdown Voltage
V BR
It = 1mA
Reverse Leakage Current
IR
VRWM = 24V, T=25°C
1
µA
Clamp ing Voltage
VC
IPP = 1A, tp = 8/20µs
43
V
Clamp ing Voltage
VC
IPP = 5A, tp = 8/20µs
55
V
Maximum Peak Pulse Current
IP P
tp = 8/20µs
5
A
Junction Cap acitance
Cj
Between I/O Pins and
Ground
VR = 0V, f = 1MHz
5
pF
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LCDA05 through LCDA24
PROTECTION PRODUCTS
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
Power Derating Curve
10
110
90
% of Rated Power or IPP
Peak Pulse Power - Ppk (kW)
100
1
0.1
80
70
60
50
40
30
20
10
0.01
0
0.1
1
10
100
0
1000
25
50
75
100
125
150
Ambient Temperature - TA (oC)
Pulse Duration - tp (µs)
Pulse Waveform
110
Waveform
Parameters:
tr = 8µs
td = 20µs
100
90
Percent of IPP
80
70
-t
e
60
50
40
td = IPP/2
30
20
10
0
0
5
10
15
20
25
30
Time (µs)
ESD Discharge Parameters Per IEC 61000-4-2
ESD Pulse Waveform (Per IEC 61000-4-2)
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Level
First
Peak
Current
(A )
Peak
Current
at 30ns
(A )
Peak
Current
at 60ns
(A )
Test
Test
Voltage
Voltage
(Contact
(A ir
Discharge) Discharge)
( kV )
(kV)
1
7.5
4
8
2
2
2
15
8
4
4
4
3
22.5
12
6
6
8
4
30
16
8
8
15
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LCDA05 through LCDA24
PROTECTION PRODUCTS
Applications Information
LCDA Connection Diagram
Device Connection for Protection of Two High-Speed
Data Lines
The LCDAxx is designed to protect up to two high-speed
data lines. The LCDAxx utilizes a low capacitance
compensation diode in series with, but in opposite
polarity to a TVS diode in each line. The resulting
capacitance is less than 5pF per line. Each line will
only suppress transient events in one polarity. Therefore, to achieve protection in both positive and negative polarity, a second TVS/rectifier pair is connected in
anti-parallel to the first. Pins 1, 2, 7, and 8 are used to
protect one data line. Pins 3, 4, 5, and 6 are used to
protect the second data line.
The device is connected as follows:
z
z
z
z
z
2
7
3
6
4
5
I/O 1
I/O 2
I/O Line Protection
Pins 1 and 2 are tied together and pins 7 and 8 are
tied together providing the protection circuit for
one I/O line. Pins 3 and 4 are tied together and
pins 5 and 6 are tied together providing the protection circuit for the second I/O line. Since the
device is electrically symmetrical, either side of the
connected pairs may be used to protect the lines.
The other side of the pair is used to make the
ground connection. 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.
Connection Options
To Protected
Device
Line 1
In/Out
Good circuit board layout is critical for the suppression
of ESD induced transients. The following guidelines are
recommended:
z
8
I/O 2
Circuit Board Layout Recommendations for Suppression of ESD.
z
1
I/O 1
Line 2
Ground
Place the TVS near the input terminals or connectors 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
8
2
7
3
6
4
5
Line 1
Ground
Line 2
In/Out
From Connector
To Protected
Device
Line 1
In/Out
1
8
2
7
3
6
Ground
4
Line 2
In/Out
5
From Connector
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LCDA05 through LCDA24
PROTECTION PRODUCTS
Applications Information (continued)
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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LCDA05 through LCDA24
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.
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LCDA05 through LCDA24
PROTECTION PRODUCTS
Ordering Information
Part
Number
Lead Finish
Qty per Reel
Reel Size
LCDA05.TB
SnPb
500
7 Inch
LCDA12.TB
SnPb
500
7 Inch
LCDA15.TB
SnPb
500
7 Inch
LCDA24.TB
SnPb
500
7 Inch
LCDA05.TBT
Pb Free
500
7 inch
LCDA12.TBT
Pb Free
500
7 inch
LCDA15.TBT
Pb Free
500
7 inch
LCDA24.TBT
Pb Free
500
7 inch
L C DA 0 5
SnPb
95/Tube
N/A
L C DA 1 2
SnPb
95/Tube
N/A
L C DA 1 5
SnPb
95/Tube
N/A
LCDA24
SnPb
95/Tube
N/A
LCDA05.T
Pb Free
95/Tube
N/A
LCDA12.T
Pb Free
95/Tube
N/A
LCDA15.T
Pb Free
95/Tube
N/A
LCDA24.T
Pb Free
95/Tube
N/A
Contact Information
Semtech Corporation
Protection Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
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