LCDA05 THRU LCDA24 Low Capacitance TVS Diode Array For High-Speed Data Interfaces PROTECTION PRODUCTS Description Features The LCDA series of TVS arrays are designed to protect sensitive electronics from damage or latch-up due to ESD and other voltage-induced transient events. Each device will protect two high-speed lines. They are available with operating voltages of 5V, 12V, 15V and 24V. They are bidirectional devices and may be used on lines where the signal polarities are above and below ground. TVS diodes are solid-state devices designed specifically for transient suppression. They offer desirable characteristics for board level protection including fast response time, low operating and clamping voltage and no device degradation. The LCDA series devices feature low capacitance compensation diodes in series with standard TVS diodes to provide an integrated, low capacitance solution for use on high-speed interfaces. The LCDA series devices may be used to meet the immunity requirements of IEC 61000-4-2, level 4. u Transient protection for high-speed data lines to u u u u u u IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact) IEC 61000-4-4 (EFT) 40A (tp = 5/50ns) IEC 61000-4-5 (Lightning) 24A (tp = 8/20µs) Protects two I/O lines Low capacitance for high-speed data lines Working voltages: 5V, 12V, 15V and 24V Low leakage current Low operating and clamping voltages Solid-state silicon avalanche technology Mechanical Characteristics u u u u JEDEC SO-8 (MS-012AA) small outline package Molding compound flammability rating: UL 94V-0 Marking : Part Number, Logo, Date Code Packaging : Tape and Reel per EIA 481 Applications u u u u u u u Circuit Diagram (Each Line Pair) High-Speed Data Lines Microprocessor Based Equipment Universal Serial Bus (USB) Port Protection Notebooks, Desktops, & Servers Instrumentation LAN/WAN Equipment Peripherals Schematic & PIN Configuration 1 8 2 7 3 6 4 5 SO-8 (Top View) Revision 9/2000 1 www.semtech.com LCDA05 THRU LCDA24 PROTECTION PRODUCTS Absolute Maximum Rating R ating Symbo l Value Units Peak Pulse Pow er (tp = 8/20µs) Pp k 300 Watts Lead Soldering 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 LCDA05 Par ame te r Reverse Stand -Off Voltage Reverse Breakd ow n Voltage Symbo l Co nd itio ns Minimum Typ ical V RWM Maximum Units 5 V V BR It = 1mA Reverse Leakage Current IR V RWM = 5V, T=25°C 20 µA Clamp ing Voltage VC IPP = 1A , tp = 8/20µ s 9.8 V Clamp ing Voltage VC IPP = 5A , tp = 8/20µ s 11 V Junction Cap acitance Cj Betw een I/O Pins and Gnd V R = 0V, f = 1MHz 5 pF Symbo l Co nd itio ns Maximum Units 12 V 6 V LCDA12 Par ame te r Reverse Stand -Off Voltage Reverse Breakd ow n Voltage Minimum V RWM Typ ical V BR It = 1mA Reverse Leakage Current IR V RWM = 12V, T=25°C 1 µA Clamp ing Voltage VC IPP = 1A , tp = 8/20µ s 19 V Clamp ing Voltage VC IPP = 5A , tp = 8/20µ s 24 V Junction Cap acitance Cj Betw een I/O Pins and Gnd V R = 0V, f = 1MHz 5 pF ã 2000 Semtech Corp. 2 13.3 V www.semtech.com LCDA05 THRU LCDA24 PROTECTION PRODUCTS Electrical Characteristics (continued) LCDA15 Par ame te r Symbo l Co nd itio ns Minimum Typ ical Maximum Units 15 V Reverse Stand-Off Voltage VRWM Reverse Breakdow n Voltage V BR It = 1mA Reverse Leakage Current IR VRWM = 15V, T=25°C 1 µA Clamp ing Voltage VC IPP = 1A, tp = 8/20µs 24 V Clamp ing Voltage VC IPP = 5A, tp = 8/20µs 30 V Junction Cap acitance Cj Betw een I/O Pins and Gnd V R = 0V, f = 1MHz 5 pF Symbo l Co nd itio ns Maximum Units 24 V 16.7 V LCDA24 Par ame te r Minimum Typ ical Reverse Stand-Off Voltage VRWM Reverse Breakdow n Voltage V BR It = 1mA Reverse Leakage Current IR VRWM = 24V, T=25°C 1 µA Clamp ing Voltage VC IPP = 1A, tp = 8/20µs 43 V Clamp ing Voltage VC IPP = 5A, tp = 8/20µs 55 V Junction Cap acitance Cj Betw een I/O Pins and Gnd V R = 0V, f = 1MHz 5 pF ã 2000 Semtech Corp. 3 26.7 V www.semtech.com LCDA05 THRU LCDA24 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 75 100 125 150 Ambient Temperature - TA (oC) Pulse Duration - tp (µs) Pulse Waveform 110 Waveform Parameters: tr = 8µs td = 20µs 100 90 Percent of IPP 80 70 e 60 -t 50 40 td = IPP/2 30 20 10 0 0 5 10 15 20 25 30 Time (µs) ESD Discharge Parameters Per IEC 61000-4-2 ESD Pulse Waveform (Per IEC 61000-4-2) ã 2000 Semtech Corp. 4 Level First Peak Current (A) Peak Current at 30ns (A) Peak Current at 60ns (A) Test Test Voltage Voltage (Contact ( A ir Discharge) Discharge) (kV) (kV) 1 7.5 4 8 2 2 2 15 8 4 4 4 3 22.5 12 6 6 8 4 30 16 8 8 15 www.semtech.com LCDA05 THRU LCDA24 PROTECTION PRODUCTS Applications Information LCDA Connection Diagram Device Connection for Protection of Two High-Speed Data Lines The LCDAxx is designed to protect up to two high-speed data lines. The LCDAxx utilizes a low capacitance compensation diode in series with, but in opposite polarity to a TVS diode in each line. The resulting capacitance is less than 5pF per line. Each line will only suppress transient events in one polarity. Therefore, to achieve protection in both positive and negative polarity, a second TVS/rectifier pair is connected in anti-parallel to the first. Pins 1, 2, 7, and 8 are used to protect one data line. Pins 3, 4, 5, and 6 are used to protect the second data line. The device is connected as follows: l l l l l 2 7 3 6 4 5 I/O 2 I/O 2 I/O Line Protection Pins 1 & 2 are tied together and pins 7 & 8 are tied together providing the protection circuit for one I/O line. Pins 3 & 4 are tied together and pins 5 & 6 are tied together providing the protection circuit for the second I/O line. Since the device is electrically symmetrical, either side of the connected pairs may be used to protect the lines. The other side of the pair is used to make the ground connection. The ground connections should be made directly to the ground plane for best results. The path length is kept as short as possible to reduce the effects of parasitic inductance in the board traces. Connection Options To Protected Device Line 1 In/Out Good circuit board layout is critical for the suppression of ESD induced transients. The following guidelines are recommended: l 8 I/O 1 Circuit Board Layout Recommendations for Suppression of ESD. l 1 I/O 1 Line 2 Ground Place the TVS near the input terminals or connectors to restrict transient coupling. Minimize the path length between the TVS 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. 1 8 2 7 3 6 4 5 Line 1 Ground Line 2 In/Out From Connector To Protected Device Line 1 In/Out 1 8 2 7 3 6 Ground 4 Line 2 In/Out 5 From Connector ã 2000 Semtech Corp. 5 www.semtech.com LCDA05 THRU LCDA24 PROTECTION PRODUCTS Outline Drawing - SO-8 Land Pattern - SO-8 ã 2000 Semtech Corp. 6 www.semtech.com LCDA05 THRU LCDA24 PROTECTION PRODUCTS Ordering Information P ar t Numbe r Wo r king Vo ltage Qty p e r Reel R e e l Size LCDA 05.TB 5V 500 7 Inch LCDA 05.TE 5V 2,500 13 Inch LCDA 12.TB 12V 500 7 Inch LCDA 12.TE 12V 2,500 13 Inch LCDA 15TB 15V 500 7 Inch LCDA 15.TE 15V 2,500 13 Inch LCDA 24.TB 24V 500 7 Inch LCDA 24.TE 24V 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. 7 www.semtech.com