LCDA12C-1 & LCDA15C-1 Low Capacitance TVS Diode Array PRELIMINARY PROTECTION PRODUCTS Description Features u ESD protection to IEC 61000-4-2, Level 4 u Lightning protection per IEC 61000-4-5 The LCDAxxC-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 LCDAxxC-1 has been optimized for easy layout on high density boards. The small SOT143 package minimizes required board space. These devices will handle up to 20 Amps for an 8/20µs lightning impulse. The low inductance construction minimizes voltage overshoot during high current surges. The LCDAxxC-1 may be used to protect ADSL interfaces, multi-protocol serial transceivers, portable electronics, and wireless systems. u u u u u u u (20A, tp=8/20µs) Configuration optimized for easy board layout Protects one line pair Low capacitance (<15pF) for high-speed interfaces Low clamping voltage Low leakage current Operating voltage: 12V & 15V Solid-state silicon-avalanche technology Mechanical Characteristics u u u u JEDEC SOT-143 package Molding compound flammability rating: UL 94V-0 Marking : Marking code Packaging : Tape and Reel per EIA 481 Applications u u u u u u u Circuit Diagram ADSL Interfaces RS-232, RS-422, V.90 Interfaces Multi-Protocol Serial Transceivers High-Speed Data Lines Portable Electronics WAN/LAN Equipment Wireless Systems Schematic & PIN Configuration SOT-143 (Top View) Revision 9/2000 1 www.semtech.com LCDA12C-1 & LCDA15C-1 PROTECTION PRODUCTS Absolute Maximum Rating R ating Symbo l Value Units Peak Pulse Pow er (tp = 8/20µ s) Pp k 500 Watts Peak Pulse Current (tp = 8/20µ s) I PP 20 A Lead Sold ering 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 LCDA12C-1 Par ame te r Symbo l Co nd itio ns Minimum Typ ical Maximum Units 12 V Reverse Stand-Off Voltage VRWM Reverse Breakdow n Voltage V BR It = 1mA Reverse Leakage Current IR VRWM = 12V, T=25°C 5 µA Clamp ing Voltage VC IPP = 5A, tp = 8/20µs 19 V Clamp ing Voltage VC IPP = 20A, tp = 8/20µs 26.6 V Junction Cap acitance Cj Betw een I/O p ins and Gnd V R = 0V, f = 1MHz 8 15 pF Typ ical Maximum Units 15 V 13.3 V LCDA15C-1 Par ame te r Symbo l Co nd itio ns Minimum Reverse Stand-Off Voltage VRWM Reverse Breakdow n 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 24 V Clamp ing Voltage VC IPP = 15A, tp = 8/20µs 33 V Junction Cap acitance Cj Betw een I/O p ins and Gnd V R = 0V, f = 1MHz 15 pF ã 2000 Semtech Corp. 2 16.7 V 8 www.semtech.com LCDA12C-1 & LCDA15C-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 - P PP (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 Pulse Waveform 75 100 125 150 Clamping Voltage vs. Peak Pulse Current 110 28 Waveform Parameters: tr = 8µs td = 20µs 90 80 70 e 60 26 Clamping Voltage - VC (V) 100 Percent of IPP 50 Ambient Temperature - TA (oC) Pulse Duration - tp (µs) -t 50 40 td = IPP/2 30 20 24 LCDA15C-1 22 20 LCDA12C-1 18 16 Waveform Parameters: tr = 8µs td = 20µs 14 12 10 0 10 0 5 10 15 20 25 30 0 5 10 15 20 25 Peak Pulse Current - IPP (A) Time (µs) Variation of Capacitance vs. Reverse Voltage 9 Capacitance (pF) 8.5 8 7.5 f=1MHz 7 0 1 2 3 4 5 6 7 8 9 10 11 12 Reverse Voltage (V) ã 2000 Semtech Corp. 3 www.semtech.com LCDA12C-1 & LCDA15C-1 PROTECTION PRODUCTS Applications Information Device Connection for Metallic Protection of HighSpeed Data Lines The LCDAxxC-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 & 4 or pins 2 & 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. The LCDA12C-1 (or LCDA15C-1 for 15 volt drivers) is connected from each line to ground on the IC side of the line. They provide lightning and ESD protection for the sensitive line driver IC. 4 1 2 Line Out 3 Figure 2 - Connection for Common Mode Protection (Line-to-Ground) Figure 3 - ADSL Protection Circuit ã 2000 Semtech Corp. 4 www.semtech.com LCDA12C-1 & LCDA15C-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 ã 2000 Semtech Corp. 5 www.semtech.com LCDA12C-1 & LCDA15C-1 PROTECTION PRODUCTS Marking Codes Par t Numbe r Mar king Co d e LCDA12C-1 12L LCDA15C-1 15L Ordering Information Par t Numbe r Wo r king Vo ltage Qty p e r Reel R e e l Size LCDA12C-1.TC 12V 3,000 7 Inch LCDA15C-1.TC 15V 3,000 7 Inch Contact Information Semtech Corporation Protection Products Division 652 Mitchell Rd., Newbury Park, CA 91320 Phone: (805)498-2111 FAX (805)498-3804 ã 2000 Semtech Corp. 6 www.semtech.com