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LCDA24C-1
Low Capacitance TVS Array
PROTECTION PRODUCTS Description
The LCDA24C-1 is a low capacitance transient voltage suppressor (TVS) diode array. It is designed to protect sensitive CMOS ICs from the damaging effects of ESD and lightning. Each device will protect one line in common (line-to-ground) mode or one line pair in metallic (Line-to-line) mode. They are low capacitance (< 15pF) making them suitable for use on high-speed telecom and datacom interfaces without signal degradation. The configuration of the LCDA24C-1 has been optimized for easy layout on high density boards. The small SOT-143 package minimizes required board space. These devices will handle up to 10 Amps for an 8/20s lightning impulse. The low inductance construction minimizes voltage overshoot during high current surges. The LCDA24C-1 may be used to protect ADSL interfaces, multi-protocol serial transceivers, portable electronics, and wireless systems.
PRELIMINARY Features
Transient protection to high-speed data lines IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns) IEC 61000-4-5 (Lightning) 0.5kV, 10A (8/20s) Configuration optimized for easy board layout Protects one line pair Low capacitance (<10pF) for high-speed interfaces Low clamping voltage Low leakage current Operating voltage: 24V Solid-state silicon-avalanche technology
Mechanical Characteristics
JEDEC SOT-143 package Lead Finish: Matte Tin Molding compound flammability rating: UL 94V-0 Marking: Marking code Packaging: Tape and Reel per EIA 481
Applications
ADSL Interfaces RS-232, RS-422, V.90 Interfaces Multi-Protocol Serial Transceivers High-Speed Data Lines Portable Electronics WAN/LAN Equipment
Circuit Diagram
Schematic & PIN Configuration
SOT-143 (Top View)
Revision 04/07/2004 1 www.semtech.com
LCDA24C-1
PROTECTION PRODUCTS Absolute Maximum Rating
R ating Peak Pulse Power (tp = 8/20s) Peak Pulse Current (tp = 8/20s) Operating Temperature Storage Temperature Symbol Pp k IP P TJ TSTG Value 500 10 -55 to +125 -55 to +150 Units Watts Amps C C
Electrical Characteristics (T=25oC)
Parameter Reverse Stand-Off Voltage Reverse Breakdown Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Peak Pulse Current Junction Cap acitance Symbol VRWM V BR IR VC VC IP P Cj It = 1mA VRWM = 24V, T=25C IPP = 1A, tp = 8/20s IPP = 10A, tp = 8/20s tp = 8/20s Between I/O p ins and Ground VR = 0V, f = 1MHz 26.7 1 43 50 10 10 Conditions Minimum Typical Maximum 24 Units V V A V V A pF
2004 Semtech Corp.
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LCDA24C-1
PROTECTION PRODUCTS Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
10 Peak Pulse Power - Ppk (kW)
PRELIMINARY
Power Derating Curve
110 100 % of Rated Power or IPP 90 80 70 60 50 40 30 20 10 0
1
0.1
0.01 0.1 1 10 Pulse Duration - tp (s) 100 1000
0
25
50
75
100
125
150
Ambient Temperature - TA (oC)
Pulse Waveform
110 100 90 80 Percent of IPP 70 60 50 40 30 20
35 50 55
Clamping Voltage vs. Peak Pulse Current
e -t
Clamping Voltage - VC (V)
45
td = I PP /2
40
10 0 0 5 10 15 T im e (s) 20 25 30
30 0 1 2 3 4 5 6 7 8
Waveform: tr = 8s td = 20s
9 10
Peak Pulse Current - IPP (A)
Capacitance vs. Reverse Voltage
4.8
f - 1 MHz
4.7
Capacitance - Cj (pF)
4.6
4.5
4.4
4.3
4.2 0 5 10 15 20 25
Reverse Voltage - VR (V)
2004 Semtech Corp.
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LCDA24C-1
PROTECTION PRODUCTS Applications Information
Device Connection for Metallic Protection of HighSpeed Data Lines The LCDA24C-1 is designed to protect high-speed data lines from transient over-voltages which result from lightning and ESD. The device is designed to protect one line in common mode (Line-to-Ground) or one line pair in metallic (Line-to-Line) mode. For metallic mode protection, the input of line 1 is connected at pin 1 and the output is connected at pin 4. Likewise, the input of line 2 is connected at pin 2 and the output is connected at pin 3. For common mode protection, ground either pins 1 and 4 or pins 2 and 3. The ground connection should be made directly to the ground plane for best results. ADSL Protection A typical ADSL protection circuit is shown in Figure 3. A protection device with an operating voltage of 270 volts is connected on the line side of the circuit. A high voltage device is used due to the presence of the ring signal. Secondary IC side protection is achieved with low voltage TVS devices. The LCDA24C-1 is connected between to transmit line pairs. Since the LCDA24C-1 has a working voltage of 24 volts, it may be used on pairs with signal swings as high as +/-12 volts. The SD05C is used to protect the receive pairs. The signal swings on these lines can be as high as +/5 volts.
Line In 1 4 Line Out
Line In
2
3
Line Out
Figure 1 - Connection for Differential Protection (Line-to-Line)
Line Out
Line In
1
4
2
3
Figure 2 - Connection for Common Mode Protection (Line-to-Ground)
Figure 3 - Typical ADSL Protection Circuit
2004 Semtech Corp. 4 www.semtech.com
LCDA24C-1
PROTECTION PRODUCTS Outline Drawing - SOT-143 PRELIMINARY
Notes: (1) Controlling dimension: Inch (unless otherwise specified). (2) Dimension A and B do not include mold protrusions. Mold protrusions are .006" max.
Land Pattern - SOT-143
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LCDA24C-1
PROTECTION PRODUCTS Device Marking Ordering Information
Part Number Working Voltage 24V Qty per Reel 3,000 R eel Size 7 Inch
24L
LCDA24C-1.TCT
Contact Information
Semtech Corporation Protection Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
2004 Semtech Corp. 6 www.semtech.com

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