LCDA12C-8 & LCDA15C-8 Low Capacitance TVS Diode Array For Multi-mode Transceiver Protection PROTECTION PRODUCTS Description Features u Transient protection for high-speed data lines to The LCDAxxC-8 has been specifically designed to protect sensitive components which are connected to data and transmission lines from over voltages caused by ESD (electrostatic discharge), EFT (electrical fast transients), and lightning. The low capacitance array configuration of the LCDAxxC-8 allows the user to protect eight high-speed data or I/O lines. They may be used on systems operating from 5 to 15 Volts. The high surge capability (500W, tp=8/20µs) makes the LCDAxxC-8 suitable for telecommunications systems operating in harsh transient environments. The low inductance construction minimizes voltage overshoot during high current surges. The features of the LCDAxxC-8 are ideal for protecting multi-protocol transceivers in WAN applications such as Frame Relay systems, routers, and switches. u u u u u IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns) IEC 61000-4-5 (Lightning) 0.5kV, 12A (8/20µs) Protects eight I/O lines Low capacitance for high-speed interfaces High surge capability Low clamping voltage Solid-state silicon avalanche technology Mechanical Characteristics u u u u JEDEC SO-16 package Molding compound flammability rating: UL 94V-0 Marking : Part number, date code, logo Packaging : Tape and Reel per EIA 481 Applications u Multi-Mode Transceiver Protection u WAN Equipment: CSU/DSU Multiplexers Routers ISP Equipment Customer Premise Equipment u Protection for any of the following interfaces: RS-232 (V.28) RS-422 (V.11, X.21) RS-449 (V.11/V.10) Circuit Diagram Schematic & PIN Configuration SO-16 (Top View) Revision 9/2000 1 www.semtech.com LCDA12C-8 & LCDA15C-8 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-8 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 & Gnd V R = 0V, f = 1MHz 8 15 pF Symbo l Co nd itio ns Typ ical Maximum Units 15 V 13.3 V LCDA15C-8 Par ame te r 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 & Gnd V R = 0V, f = 1MHz 15 pF ã 2000 Semtech Corp. 2 16.7 V 8 www.semtech.com LCDA12C-8 & LCDA15C-8 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 - P PP (kW) 100 1 0.1 80 70 60 50 40 30 20 10 0 0.01 0.1 1 10 100 0 1000 25 50 100 125 150 175 Clamping Voltage vs. Peak Pulse Current Pulse Waveform 110 28 Waveform Parameters: tr = 8µs td = 20µs 90 80 70 e 60 26 Clamping Voltage - VC (V) 100 Percent of IPP 75 Ambient Temperature - TA (oC) Pulse Duration - tp (µs) -t 50 40 td = IPP/2 30 20 24 LCDA15C-8 22 20 LCDA12C-8 18 16 Waveform Parameters: tr = 8µs td = 20µs 14 12 10 0 10 0 5 10 15 20 25 30 0 Time (µs) ã 2000 Semtech Corp. 5 10 15 20 25 Peak Pulse Current - IPP (A) 3 www.semtech.com LCDA12C-8 & LCDA15C-8 PROTECTION PRODUCTS Applications Information Device Connection Device Connection Options for Protection of Eight High-Speed Data Lines The LCDAxxC-8 may be configured to protect up to eight I/O lines operating between 5 and 15V. It may be used to protect the most popular serial data interface standard lines making it ideal for use in equipment utilizing multi-mode transceivers. The LCDAxxC-8 is symmetrical so the data lines may be connected at pins 1-8 or 9-16. Pins 9-16 or 1-8 are connected to ground as shown. For best results, these pins should be connected directly to a ground plane on the board. The path length should be kept as short as possible to minimize parasitic inductance. Multi-Mode Transceiver Protection The LCDAxxC-8 may be used to protect multi-mode transceiver I/O lines with external connections. The LCDAxxC-8 adds a maximum loading capacitance of 15pF with a working voltage of 12V or 15V. This allows the transceiver to safely operate in all modes without clipping or degradation of the signal. With proper design and layout, the transceiver port can be protected to >15kV (HBM per IEC 61000-4-2). Circuit Board Layout Recommendations for Suppression of ESD. Good circuit board layout is critical for the suppression of fast rise-time transients such as ESD. The following guidelines are recommended: l l l l l l Place the LCDAxxC-8 near the input terminals or connectors to restrict transient coupling. Minimize the path length between the LCDAxxC-8 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. ã 2000 Semtech Corp. 4 www.semtech.com LCDA12C-8 & LCDA15C-8 PROTECTION PRODUCTS Outline Drawing - SO-16 Land Pattern - SO-16 ã 2000 Semtech Corp. 5 www.semtech.com LCDA12C-8 & LCDA15C-8 PROTECTION PRODUCTS Ordering Information Par t Numbe r Wo r king Vo ltage Qty p e r Reel R e e l Size LCDA12C-8.TE 12V 2,500 13 Inch LCDA15C-8.TE 15V 2,500 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 ã 2000 Semtech Corp. 6 www.semtech.com