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| Low Capacitance TVS Diode Array For Multi-mode Transceiver Protection PROTECTION PRODUCTS Description 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=8/20s) 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. LCDA12C-8 & LCDA15C-8 Features u Transient protection for high-speed data lines to 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 (8/20s) Protects eight I/O lines Low capacitance for high-speed interfaces High surge capability Low clamping voltage Solid-state silicon avalanche technology u u u u u u u u u Mechanical Characteristics 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 Peak Pulse Pow er (tp = 8/20 s) Peak Pulse Current (tp = 8/20 s) Lead Sold ering Temp erature Op erating Temp erature Storage Temp erature Symbo l Pp k I PP TL TJ TSTG Value 500 20 260 (10 sec.) -55 to +125 -55 to +150 Units Watts A C C C Electrical Characteristics LCDA12C-8 Par ame te r Reverse Stand-Off Voltage Reverse Breakdow n Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Junction Cap acitance Symbo l VRWM V BR IR VC VC Cj It = 1mA VRWM = 12V, T=25C IPP = 5A, tp = 8/20s IPP = 20A, tp = 8/20s Betw een I/O p ins & Gnd V R = 0V, f = 1MHz 8 13.3 5 19 26.6 15 Co nd itio ns Minimum Typ ical Maximum 12 Units V V A V V pF LCDA15C-8 Par ame te r Reverse Stand-Off Voltage Reverse Breakdow n Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Junction Cap acitance Symbo l VRWM V BR IR VC VC Cj It = 1mA VRWM = 15V, T=25C IPP = 1A, tp = 8/20s IPP = 15A, tp = 8/20s Betw een I/O p ins & Gnd V R = 0V, f = 1MHz 8 16.7 5 24 33 15 Co nd itio ns Minimum Typ ical Maximum 15 Units V V A V V pF a 2000 Semtech Corp. 2 www.semtech.com LCDA12C-8 & LCDA15C-8 PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time 10 110 100 Peak Pulse Power - P PP (kW) 90 % of Rated Power or IPP 80 70 60 50 40 30 20 10 0.01 0.1 1 10 Pulse Duration - tp (s) 100 1000 0 0 25 50 75 100 125 150 175 Ambient Temperature - TA (oC) 1 Power Derating Curve 0.1 Pulse Waveform 110 100 90 80 Percent of IPP 70 60 50 40 30 20 10 0 0 5 10 15 Time (s) 20 25 30 td = IPP/2 e -t Clamping Voltage vs. Peak Pulse Current 28 Waveform Parameters: tr = 8s td = 20s 26 Clamping Voltage - VC (V) 24 22 20 18 16 14 12 10 0 5 10 15 20 25 Peak Pulse Current - IPP (A) Waveform Parameters: tr = 8s td = 20s LCDA15C-8 LCDA12C-8 a 2000 Semtech Corp. 3 www.semtech.com LCDA12C-8 & LCDA15C-8 PROTECTION PRODUCTS Applications Information 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 Device Connection 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. a 2000 Semtech Corp. 4 www.semtech.com LCDA12C-8 & LCDA15C-8 PROTECTION PRODUCTS Outline Drawing - SO-16 Land Pattern - SO-16 a 2000 Semtech Corp. 5 www.semtech.com LCDA12C-8 & LCDA15C-8 PROTECTION PRODUCTS Ordering Information Par t Numbe r LCDA12C-8.TE LCDA15C-8.TE Wo r king Vo ltage 12V 15V Qty p e r Reel 2,500 2,500 R e e l Size 13 Inch 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 a 2000 Semtech Corp. 6 www.semtech.com |
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