LCDA15C-6 Low Capacitance TVS Diode Array For Multi-mode Tranciever Protection PROTECTION PRODUCTS Description Features The LCDA15C-6 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 LCDA15C-6 allows the user to protect six 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 LCDA15C-6 suitable for telecommunications systems operating in harsh transient environments. The low inductance construction minimizes voltage overshoot during high current surges. The features of the LCDA15C-6 are ideal for protecting multi-protocol transceivers in WAN applications such as Frame Relay systems, routers, and switches. u Transient protection for high-speed data lines to 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 six 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-8 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) RS-485 Circuit Diagram Schematic & PIN Configuration SO-8 (Top View) Revision 9/2000 1 www.semtech.com LCDA15C-6 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 15 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 LCDA15C-6 Par ame te r Symbo l Co nd itio ns Minimum Typ ical Maximum Units 15 V Reverse Stand -Off Voltage VRWM Reverse Breakd ow n Voltage V BR It= 1mA Reverse Leakage Current IR V RWM = 15V, T=25°C 5 µA Clamp ing Voltage VC IPP = 1A , tp = 8/20µ s 24 V Clamp ing Voltage VC IPP = 15A , tp = 8/20µ s 33 V Junction Cap acitance Cj Betw een I/O p ins and Gnd V R = 0V, f = 1MHz 8 15 pF Betw een I/O p ins V R = 0V, f = 1MHz 3 ã 2000 Semtech Corp. 2 16.7 V pF www.semtech.com LCDA15C-6 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 Pulse Waveform 100 125 150 175 Clamping Voltage vs. Peak Pulse Current 28 110 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 22 20 18 16 Waveform Parameters: tr = 8µs td = 20µs 14 12 10 10 0 0 5 10 15 20 25 0 30 ã 2000 Semtech Corp. 2 4 6 8 10 12 14 16 Peak Pulse Current - IPP (A) Time (µs) 3 www.semtech.com LCDA15C-6 PROTECTION PRODUCTS Applications Information Device Connection Options for Protection of Six HighSpeed Data Lines Device Connection The LCDA16C-6 may be configured to protect up to six 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. Data lines are connected at pins 1, 2, 3, 6, 7, and 8. Pins 4 and 5 are connected to ground. 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 A typical multi-mode transceiver protection circuit is shown. The LCDA15C-6 is used to protect I/O lines with external connections. The LCDA15C-6 adds a maximum loading capacitance of 15pF with a working voltage of 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). Multi-Mode Tranceiver Protection Example 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 Place the LCDA15C-6 near the input terminals or connectors to restrict transient coupling. l Minimize the path length between the LCDA15C-6 and the protected line. l Minimize all conductive loops including power and ground loops. l The ESD transient return path to ground should be kept as short as possible. l Never run critical signals near board edges. l Use ground planes whenever possible. ã 2000 Semtech Corp. 4 www.semtech.com LCDA15C-6 PROTECTION PRODUCTS Outline Drawing - SO-8 Land Pattern - SO-8 ã 2000 Semtech Corp. 5 www.semtech.com LCDA15C-6 PROTECTION PRODUCTS Ordering Information Par t Numbe r Wo r king Vo ltage Qty p e r R e e l R e e l Size LCDA15C-6.TB 15V 500 7 Inch LCDA15C-6.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