LC04-12TE [SEMTECH]
Dual Low Capacitance TVS Array for Telecom Line-Card Applications; 双低电容TVS阵列电信线卡应用
| 型号： | LC04-12TE |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | Dual Low Capacitance TVS Array for Telecom Line-Card Applications |
| 文件： | 总8页 (文件大小：201K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LC04-12
Dual Low Capacitance TVS Array
for Telecom Line-Card Applications
PROTECTION PRODUCTS
Features
Description
The LC04-12 has been specifically designed to protect
sensitive components which are connected to high-
speed telecommunications lines from over voltages
caused by lightning, ESD (electrostatic discharge), and
EFT (electrical fast transients).
u Transient protection for high-speed data lines to
Bellcore GR 1089 IPP=100A (2/10µs)
ITU K.20 IPP=100A (5/310µs)
IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact)
IEC 61000-4-5 (Lightning) IPP=100A (8/20µs)
u Protects two tip and ring line pairs
u Low capacitance for high-speed interfaces
u High surge capability
The device is in a JEDEC SO-16 NB package. It is
designed to provide metallic (Tip to Ring) or common
mode (Tip to Ground & Ring to Ground) surge protec-
tion for up to two Tip and Ring pairs. The low capaci-
tance topology means signal integrity is preserved on
high-speed lines. The high surge capability (600W,
tp=10/1000µs) makes the LC04-12 suitable for
telecommunications systems operating in harsh tran-
sient environments. The LC04-12 is designed to meet
the lightning surge requirements of Bellcore GR-
1089(intra-building), ITU K.20, and IEC 61000-4-5.
u Low clamping voltage
u Solid-state silicon avalanche technology
Mechanical Characteristics
u JEDEC SO-16 package
u Molding compound flammability rating: UL 94V-0
u Marking : Part number, date code, logo
u Packaging : Tube or Tape and Reel per EIA 481
The features of the LC04-12 are ideal for protecting
ADSL, RS-232, RS-423, RS-422, and V.90 interfaces.
Applications
u ADSL/HDSL
u RS-232 & RS-423
u V.90
u WAN/LAN Equipment
u Cable Modems
Circuit Diagram
Schematic & PIN Configuration
TIP
RING
SO-16 (Top View)
www.semtech.com
Revision 9/2000
1
LC04-12
PROTECTION PRODUCTS
Absolute Maximum Rating
Rating
Peak Pulse Power (tp = 10/1000µs)
Peak Pulse Current (tp = 10/1000 µs)
Peak Pulse Current (tp = 8/20µs)
Lead Soldering Temperature
Operating Temperature
Symbol
Ppk
Value
600
Units
Watts
A
IPP
25
IPP
100
A
TL
260 (10 sec.)
-55 to +125
-55 to +150
°C
TJ
°C
Storage Temperature
TSTG
°C
Electrical Characteristics
LC04-12
Parameter
Reverse Stand-Off Voltage
Reverse Breakdown Voltage
Reverse Leakage Current
Clamping Voltage
Symbol
Conditions
Minimum
Typical
Maximum
Units
VRWM
VBR
IR
12
V
V
It = 1mA
13.3
VRWM = 12V, T=25°C
2
µA
V
VC
IPP = 10A,
19.5
tp = 10/1000µs
Clamping Voltage
VC
Cj
IPP = 25A,
tp = 10/1000µs
24
15
V
Junction Capacitance
Each Line
pF
VR = 0V, f = 1MHz
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ã 2000 Semtech Corp.
2
LC04-12
PROTECTION PRODUCTS
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
Power Derating Curve
100
110
100
90
80
70
60
50
40
30
20
10
0
10
1
0.1
0
25
50
75
100
125
150
0.1
1
10
100
1000
Ambient Temperature - TA (oC)
Pulse Duration - tp (µs)
Pulse Waveform
Clamping Voltage vs. Peak Pulse Current
(tp=8/20ms)
110
25
20
15
10
5
Waveform
Parameters:
tr = 8µs
td = 20µs
100
90
80
70
60
50
40
30
20
10
0
e-t
td = IPP/2
Waveform
Parameters:
tr = 8 s
µ
td = 20 s
µ
0
0
5
10
15
20
25
30
0
20
40
60
80
100
120
140
160
Time (µs)
Peak Pulse Current - Ipp (A)
Clamping Voltage vs. Peak Pulse Current
(tp=10/1000ms)
30
25
20
15
10
5
Waveform
Parameters:
tr = 10µs
td = 1000µs
0
0
5
10
15
20
25
30
Peak Pulse Current - Ipp (A)
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ã 2000 Semtech Corp.
3
LC04-12
PROTECTION PRODUCTS
Applications Information
Device Connection Options
Figure 1 - Connection for Differential (Line-to-Line)
Protection of two Tip/Ring Line Pairs
The LC04-12 is designed to protect up to four high-
speed data lines (two differential pairs) from transient
over-voltages which result from lightning and ESD.
Differential protection of two line pairs is achieved by
connecting the device as follows (Figure 1): Pins 1-4
are connected to line 1 of the first pair (i.e. Tip 1) and
pins 13-16 are connected to line 2 of the first pair (i.e.
Ring 1). Pins 5-8 are connected to line 1 of the second
pair (i.e. Tip 2) and pins 9-12 are connected to line two
of the second pair (i.e. Ring 2).
TIP 1
RING 1
Common mode protection of one line pair is achieved
by connecting the device as shown in Figure 2. The
protected lines are connected at pins 1-4 and pins 9-
12. connection to ground is made at pins 5-8 and 13-
16. optionally, the lines may be connected at pins 1-4
and 5-8 with pins 9-16 being connected to ground.
RING 2
TIP 2
Figure 2 - Connection for Common Mode (Line-to-
Ground) Protection of one Tip/Ring Line Pair
All pins should be connected for best results. Minimize
parasitic inductance in the protection circuit path by
keeping the trace length between the protected line
and the LC04-12 as short as possible. Ground con-
nections should be made directly to the ground plane.
TIP
GND
ADSL Protection
Configuring The LC04-12 for Remote Terminal ADSL
Applications
A typical ADSL protection circuit for remote terminals is
shown in Figure 3. The LC04-12 is connected between
Tip & Ring on the transmit and receive line pairs. It
provides protection to common mode (line-to-ground)
lightning and ESD surges. It is designed to meet the
intra-building requirements of Bellcore GR-1089. To
complete the protection circuit, the LCDA12C-1 is
employed as the IC side protection element. This
device helps prevent the transceiver from latching up
by providing fine clamping of transients that are
coupled through the transformer.
RING
GND
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ã 2000 Semtech Corp.
4
LC04-12
PROTECTION PRODUCTS
Applications Information (Continued)
Configuring The LC04-12 for Central Office ADSL
Applications
For Central Office applications, the LC04-12 can be
configured for operation to 24V with the addition of
two external steering diodes. This is accomplished by
connecting two adjacent legs of the LC04-12 in series
and adding the steering diodes as shown in Figure 4.
Each of the TVS diodes has a working voltage of 12V.
Since the voltages are additive when series connected,
the device will have a working voltage of 24V. The
power rating of the device is effectively doubled since
the surge current capability remains unchanged.
During positive duration transients, the internal TVS
diodes of the LC04-12 will be reversed biased when
the line voltage exceeds 24V. Transient current will
flow through the LC04-12 to ground. For negative
duration transient, the external steering diodes (D1 &
D2) will be forward biased when the voltage exceeds
the forward voltage (VF) of the device.
The steering diodes are required to insure that the
internal compensation diodes of the LC04-12 are not
reverse biased as this would result in their destruction.
The ES1A ultrafast rectifiers have been found to work
well in this application. These devices will survive the
Bellcore 1089 (intra-building) and ITU K.20/K.21
surges and have a repetitive reverse voltage rating of
50V, and a typical junction capacitance of 10pF.
The total capacitance seen by the line will typically be
<25pF. This is determined by the sum of the capaci-
tance of the steering diode and 1/2 of the capacitance
of each line pair of the LC04-12.
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ã 2000 Semtech Corp.
5
LC04-12
PROTECTION PRODUCTS
Typical Applications
Figure 3 - ADSL Protection (Remote Terminal)
Component
Part
Description
Number
TVS
LC04-12
Low capacitance
TVS diode array
D1 & D2
ES1A
Ultrafast surface
mount rectifier
Figure 4- LC04-12 Configured for 24V Lines (ADSL Central Office)
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ã 2000 Semtech Corp.
6
LC04-12
PROTECTION PRODUCTS
Outline Drawing - SO-16
Land Pattern - SO-16
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ã 2000 Semtech Corp.
7
LC04-12
PROTECTION PRODUCTS
Ordering Information
Part
Number
Working
Voltage
Qty per
Reel
Reel Size
LC04-12.TB
LC04-12.TE
12V
12V
500
7 Inch
2500
13 Inch
Note:
(1) No suffix indicates tube pack.
Contact Information
Semtech Corporation
Protection Products Division
652 Mitchell Rd., Newbury Park, CA 91320
Phone: (805)498-2111 FAX (805)498-3804
www.semtech.com
ã 2000 Semtech Corp.
8
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