LCDA24C-1 Low Capacitance TVS Array PRELIMINARY PROTECTION PRODUCTS Description Features 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 8/20µs 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. 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 (8/20µs) 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 Circuit Diagram ADSL Interfaces RS-232, RS-422, V.90 Interfaces Multi-Protocol Serial Transceivers High-Speed Data Lines Portable Electronics WAN/LAN Equipment Schematic & PIN Configuration SOT-143 (Top View) Revision 04/07/2004 1 www.semtech.com LCDA24C-1 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 10 Amps Operating Temperature TJ -55 to +125 °C TSTG -55 to +150 °C Storage Temperature Electrical Characteristics (T=25oC) Parameter Symbol Conditions Minimum Typical Maximum Units 24 V 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 = 10A, tp = 8/20µs 50 V Peak Pulse Current IP P tp = 8/20µs 10 A Junction Cap acitance Cj Between I/O p ins and Ground VR = 0V, f = 1MHz 10 pF 2004 Semtech Corp. 2 26.7 V www.semtech.com LCDA24C-1 PRELIMINARY PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve 10 110 % of Rated Power or IPP Peak Pulse Power - Ppk (kW) 100 1 0.1 90 80 70 60 50 40 30 20 10 0 0.01 0.1 1 10 100 0 1000 25 50 75 100 125 150 Ambient Temperature - TA (oC) Pulse Duration - tp (µs) Pulse Waveform Clamping Voltage vs. Peak Pulse Current 110 55 100 90 50 Percent of IPP 70 Clamping Voltage - VC (V) 80 e -t 60 50 40 td = I PP /2 30 45 40 20 35 10 Waveform: tr = 8µs td = 20µs 0 0 5 10 15 20 25 30 30 0 T im e (µs) 1 2 3 4 5 6 7 8 9 10 Peak Pulse Current - IPP (A) Capacitance vs. Reverse Voltage 4.8 f - 1 MHz Capacitance - Cj (pF) 4.7 4.6 4.5 4.4 4.3 4.2 0 5 10 15 20 25 Reverse Voltage - VR (V) 2004 Semtech Corp. 3 www.semtech.com 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. Line In 1 Line In 2 4 Line Out 3 Line Out Figure 1 - Connection for Differential Protection (Line-to-Line) Line In 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. 1 2 4 Line Out 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 PRELIMINARY PROTECTION PRODUCTS Outline Drawing - SOT-143 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 2004 Semtech Corp. 5 www.semtech.com LCDA24C-1 PROTECTION PRODUCTS Device Marking Ordering Information 24L Part Number Working Voltage Qty per Reel R eel Size LCDA24C-1.TCT 24V 3,000 7 Inch 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