LCDA12C-8 and LCDA15C-8 Low Capacitance TVS Diode Array For Multi-mode Transceiver Protection PROTECTION PRODUCTS Description Features The LCDAxxC-8 has been specifically designed to protect sensitive components which are connected to data and transmission lines from over voltages caused by electrostatic discharge (ESD), electrical fast transients (EFT), 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. 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 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 Multi-Mode Transceiver Protection WAN Equipment: CSU/DSU Multiplexers Routers ISP Equipment Customer Premise Equipment 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 Pin 1 Pin 16 SO-16 (Top View) Revision 01/15/03 1 www.semtech.com LCDA12C-8 and LCDA15C-8 PROTECTION PRODUCTS Absolute Maximum Rating R ating Symbol Value Units Peak Pulse Power (tp = 8/20s) Pp k 500 Watts Lead Soldering Temperature TL 260 (10 sec.) C Operating Temperature TJ -55 to +125 C TSTG -55 to +150 C Storage Temperature Electrical Characteristics LCDA12C-8 Parameter Symbol Conditions Minimum Typical Maximum Units 12 V Reverse Stand-Off Voltage VRWM Reverse Breakdown Voltage V BR It = 1mA Reverse Leakage Current IR VRWM = 12V, T=25C 5 A Clamp ing Voltage VC IPP = 5A, tp = 8/20s 19 V Clamp ing Voltage VC IPP = 20A, tp = 8/20s 26.6 V Peak Pulse Current IP P tp = 8/20s 20 A Junction Cap acitance Cj Between I/O p ins and Ground VR = 0V, f = 1MHz 8 15 pF Symbol Conditions Typical Maximum Units 15 V 13.3 V LCDA15C-8 Parameter Minimum Reverse Stand-Off Voltage VRWM Reverse Breakdown Voltage V BR It = 1mA Reverse Leakage Current IR VRWM = 15V, T=25C 5 A Clamp ing Voltage VC IPP = 1A, tp = 8/20s 24 V Clamp ing Voltage VC IPP = 15A, tp = 8/20s 33 V Peak Pulse Current IP P tp = 8/20s 15 A Junction Cap acitance Cj Between I/O p ins and Ground VR = 0V, f = 1MHz 15 pF 2003 Semtech Corp. 2 16.7 V 8 www.semtech.com LCDA12C-8 and 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 - Ppk (kW) 100 1 0.1 80 70 60 50 40 30 20 10 0.01 0 0.1 1 10 100 1000 0 25 50 125 150 175 28 110 W aveform Parameters: tr = 8 s td = 20 s 90 26 Clamping Voltage - VC (V) 100 80 Percent of IPP 100 Clamping Voltage vs. Peak Pulse Current Pulse Waveform 70 e -t 60 50 40 td = I PP /2 30 20 24 LCDA15C-8 22 20 18 LCDA12C-8 16 Waveform Parameters: tr = 8s td = 20s 14 12 10 10 0 0 0 5 10 15 20 25 5 10 30 15 20 25 Peak Pulse Current - IPP (A) T im e (s) LCDA12C-8 Capacitance vs. Reverse Voltage LCDA15C-8 Capacitance vs. Reverse Voltage 12 6 10 5 Capacitance - Cj (pF) Capacitance - Cj (pF) 75 Ambient Temperature - TA (oC) Pulse Duration - tp (s) 8 6 4 2 4 3 2 1 f = 1MHz f = 1MHz 0 0 2 4 6 8 10 0 12 0 Reverse Voltage - VR (V) 2003 Semtech Corp. 2 4 6 8 10 12 14 Reverse Voltage - VR (V) 3 www.semtech.com LCDA12C-8 and 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: z z z z z z 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. 2003 Semtech Corp. 4 www.semtech.com LCDA12C-8 and LCDA15C-8 PROTECTION PRODUCTS Outline Drawing - SO-16 Land Pattern - SO-16 2003 Semtech Corp. 5 www.semtech.com LCDA12C-8 and LCDA15C-8 PROTECTION PRODUCTS Ordering Information Part Number Working Voltage Qty per Reel R eel 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 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 2003 Semtech Corp. 6 www.semtech.com