SMDA05 THRU SMDA24 Unidirectional TVS Array for Protection of Four Lines PROTECTION PRODUCTS Description Features u Transient protection for data lines to The SMDAxx series of TVS arrays are designed to provide undirectional protection for sensitive electronics from damage or latch-up due to ESD, lightning and other voltage-induced transient events. Each device will protect four data or I/O lines. They are available with operating voltages of 5V, 12V, 15V and 24V. u u u u u u u 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 low profile SO-8 package allows the user to protect up to four independent lines with one package. The SMDAxx series is suitable protection for sensitive semiconductors components such as microprocessors, ASICs, transceivers, transducers, and CMOS memory. IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns) IEC 61000-4-5 (Lightning) 12A (8/20µs) Undirectional protection Small SO-8 package Protects four I/O 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 package Molding compound flammability rating: UL 94V-0 Marking : Part number, date code, logo Packaging : Tube or Tape and Reel per EIA 481 Applications The SMDAxx series devices may be used to meet the ESD immunity requirements of IEC 61000-4-2, level 4 for air and contact discharge. u u u u u u u RS-232 data lines Microprocessor based equipment Notebooks, Desktops, & Servers Instrumentation LAN/WAN equipment Peripherals Serial and Parallel Ports Schematic & PIN Configuration 1 8 2 7 3 6 4 5 SO-8 (Top View) Revision 9/2000 1 www.semtech.com SMDA05 THRU SMDA24 PROTECTION PRODUCTS Absolute Maximum Rating R ating Peak Pulse Pow er (tp = 8/20µ s) Symbo l Value Units Pp k 300 Watts >25 kV ESD Voltage (HBM p er (IEC 61000-4-2) 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 SMDA05 Par ame te r Symbo l Co nd itio ns Minimum Typ ical Maximum Units 5 V Reverse Stand -Off Voltage VRWM Reverse Breakd ow n Voltage 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 Maximum Peak Pulse Current I PP tp = 8/20µ s 17 A Junction Cap acitance Cj V R = 0V, f = 1MHz 400 pF Symbo l Co nd itio ns Maximum Units 12 V 6 V SMDA12 Par ame te r Minimum Typ ical Reverse Stand -Off Voltage VRWM Reverse Breakd ow n Voltage 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 Maximum Peak Pulse Current I PP tp = 8/20µ s 12 A Junction Cap acitance Cj V R = 0V, f = 1MHz 150 pF ã 2000 Semtech Corp. 2 13.3 V www.semtech.com SMDA05 THRU SMDA24 PROTECTION PRODUCTS Electrical Characteristics (Continued) SMDA15 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 1 µA Clamp ing Voltage VC IPP = 1A , tp = 8/20µ s 24 V Clamp ing Voltage VC IPP = 5A , tp = 8/20µ s 30 V Maximum Peak Pulse Current I PP tp = 8/20µ s 10 A Junction Cap acitance Cj V R = 0V, f = 1MHz 100 pF Symbo l Co nd itio ns Maximum Units 24 V 16.7 V SMDA24 Par ame te r Minimum Typ ical Reverse Stand -Off Voltage VRWM Reverse Breakd ow n Voltage V BR It = 1mA Reverse Leakage Current IR V RWM = 24V, T=25°C 1 µA Clamp ing Voltage VC IPP = 1A , tp = 8/20µ s 43 V Clamp ing Voltage VC IPP = 5A , tp = 8/20µ s 55 V Maximum Peak Pulse Current I PP tp = 8/20µ s 5 A Junction Cap acitance Cj V R = 0V, f = 1MHz 60 pF ã 2000 Semtech Corp. 3 26.7 V www.semtech.com SMDA05 THRU SMDA24 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) IEC 61000-4-2 Discharge Parameters ESD Pulse Waveform (IEC 61000-4-2) Level ã 2000 Semtech Corp. 4 First Peak Current Peak Current at 30 ns Peak Current at 60 ns Test Test Voltage Voltage (Contact ( A ir Disch arge) Disch arge) (kV ) (kV ) (A) (A) (A) 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 SMDA05 THRU SMDA24 PROTECTION PRODUCTS Applications Information Device Connection for Protection of Four Data Lines Circuit Diagram The SMDAxx series devices are designed to protect up to four data lines. The devices are connected as follows: l The SMDAxx are unidirectional devices and are designed for use on lines where the normal operating voltage is above ground. Pins 1, 2, 3, and 4 are connected to the protected lines. Pins 5, 6, 7, and 8 are connected to ground. 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. Circuit Board Layout Recommendations for Suppression of ESD. 1 8 2 7 3 6 4 5 I/O Line Protection Good circuit board layout is critical for the suppression of ESD induced transients. The following guidelines are recommended: l l l l l l 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. Typical Connection To Protected Device 1 8 2 7 3 6 4 5 Ground From Connector ã 2000 Semtech Corp. 5 www.semtech.com SMDA05 THRU SMDA24 PROTECTION PRODUCTS Outline Drawing - SO-8 Land Pattern - SO-8 ã 2000 Semtech Corp. 6 www.semtech.com SMDA05 THRU SMDA24 PROTECTION PRODUCTS Ordering Information Par t Numbe r Wo r king Vo ltage Qty p e r Reel R e e l Size SMDA 05.TB 5V 500 7 Inch SMDA 12.TB 12V 500 7 Inch SMDA 15.TB 15V 500 7 Inch SMDA 24.TB 24V 500 7 Inch Note: (1) No suffix indicates tube pack. (2) Consult factory for availability of 13 Inch reels. 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