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| Low Capacitance TVS Diode Array For High-Speed Data Interfaces PROTECTION PRODUCTS Description 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. LCDA05 THRU LCDA24 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 (tp = 5/50ns) IEC 61000-4-5 (Lightning) 24A (tp = 8/20s) 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 u u u u u u u u u u u u u u u u u Mechanical Characteristics 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 High-Speed Data Lines Microprocessor Based Equipment Universal Serial Bus (USB) Port Protection Notebooks, Desktops, & Servers Instrumentation LAN/WAN Equipment Peripherals Circuit Diagram (Each Line Pair) 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 Peak Pulse Pow er (tp = 8/20s) Lead Soldering Temp erature Op erating Temp erature Storage Temp erature Symbo l Pp k TL TJ TSTG Value 300 260 (10 sec.) -55 to +125 -55 to +150 Units Watts C C C Electrical Characteristics LCDA05 Par ame te r Reverse Stand -Off Voltage Reverse Breakd ow n Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Junction Cap acitance Symbo l V RWM V BR IR VC VC Cj It = 1mA V RWM = 5V, T=25C IPP = 1A , tp = 8/20 s IPP = 5A , tp = 8/20 s Betw een I/O Pins and Gnd V R = 0V, f = 1MHz 6 20 9.8 11 5 Co nd itio ns Minimum Typ ical Maximum 5 Units V V A V V pF LCDA12 Par ame te r Reverse Stand -Off Voltage Reverse Breakd ow n Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Junction Cap acitance Symbo l V RWM V BR IR VC VC Cj It = 1mA V RWM = 12V, T=25C IPP = 1A , tp = 8/20 s IPP = 5A , tp = 8/20 s Betw een I/O Pins and Gnd V R = 0V, f = 1MHz 13.3 1 19 24 5 Co nd itio ns Minimum Typ ical Maximum 12 Units V V A V V pF a 2000 Semtech Corp. 2 www.semtech.com LCDA05 THRU LCDA24 PROTECTION PRODUCTS Electrical Characteristics (continued) LCDA15 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 = 5A, tp = 8/20s Betw een I/O Pins and Gnd V R = 0V, f = 1MHz 16.7 1 24 30 5 Co nd itio ns Minimum Typ ical Maximum 15 Units V V A V V pF LCDA24 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 = 24V, T=25C IPP = 1A, tp = 8/20s IPP = 5A, tp = 8/20s Betw een I/O Pins and Gnd V R = 0V, f = 1MHz 26.7 1 43 55 5 Co nd itio ns Minimum Typ ical Maximum 24 Units V V A V V pF a 2000 Semtech Corp. 3 www.semtech.com LCDA05 THRU LCDA24 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 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 Waveform Parameters: tr = 8s td = 20s ESD Pulse Waveform (Per IEC 61000-4-2) ESD Discharge Parameters Per IEC 61000-4-2 Level First Peak Current (A) 7.5 15 22.5 30 Peak Current at 30ns (A) 4 8 12 16 Peak Current at 60ns (A) 8 4 6 8 Test Test Voltage Voltage (Contact ( A ir Discharge) Discharge) (kV) (kV) 2 4 6 8 2 4 8 15 1 2 3 4 a 2000 Semtech Corp. 4 www.semtech.com LCDA05 THRU LCDA24 PROTECTION PRODUCTS Applications Information 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 I/O 1 2 7 LCDA Connection Diagram 1 8 I/O 1 3 I/O 2 4 6 I/O 2 5 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 1 8 Circuit Board Layout Recommendations for Suppression of ESD. Good circuit board layout is critical for the suppression of ESD induced transients. The following guidelines are recommended: l l l l l l Line 1 In/Out 2 7 Line 1 Ground 3 6 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. Line 2 Ground 4 5 Line 2 In/Out From Connector To Protected Device Line 1 In/Out 1 8 2 7 Ground 3 6 4 Line 2 In/Out 5 From Connector a 2000 Semtech Corp. 5 www.semtech.com LCDA05 THRU LCDA24 PROTECTION PRODUCTS Outline Drawing - SO-8 Land Pattern - SO-8 a 2000 Semtech Corp. 6 www.semtech.com LCDA05 THRU LCDA24 PROTECTION PRODUCTS Ordering Information P ar t Numbe r LCDA 05.TB LCDA 05.TE LCDA 12.TB LCDA 12.TE LCDA 15TB LCDA 15.TE LCDA 24.TB LCDA 24.TE Wo r king Vo ltage 5V 5V 12V 12V 15V 15V 24V 24V Qty p e r Reel 500 2,500 500 2,500 500 2,500 500 2,500 R e e l Size 7 Inch 13 Inch 7 Inch 13 Inch 7 Inch 13 Inch 7 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. 7 www.semtech.com |
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