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| TVS Diode Array For ESD and Latch-Up Protection PROTECTION PRODUCTS Description The SMF series TVS arrays are designed to protect sensitive electronics from damage or latch-up due to ESD and other voltage-induced transient events. They are designed for use in applications where board space is at a premium. Each device will protect up to four lines. They are unidirectional devices and may be used on lines where the signal polarities are above ground. TVS diodes are solid-state devices designed specifically for transient suppression. They feature large cross-sectional area junctions for conducting high transient currents. They offer desirable characteristics for board level protection including fast response time, low operating and clamping voltage, and no device degradation. The SMF series devices may be used to meet the immunity requirements of IEC 61000-4-2, level 4. The small SC70 package makes them ideal for use in portable electronics such as cell phones, PDAs, notebook computers, and digital cameras. SMF05 AND SMF12 Features u Transient protection for data lines to u u u u u u u u u u u u u u u u u u IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns) Small package for use in portable electronics Protects four I/O lines Working voltage: 5V & 12V Low leakage current Low operating and clamping voltages Solid-state silicon-avalanche technology Mechanical Characteristics EIAJ SC70-5L package Molding compound flammability rating: UL 94V-0 Marking : Marking Code Packaging : Tape and Reel per EIA 481 Applications Cellular Handsets & Accessories Cordless Phones Personal Digital Assistants (PDAs) Notebooks & Handhelds Portable Instrumentation Digital Cameras Peripherals MP3 Players Circuit Diagram 1 3 4 5 Schematic & PIN Configuration 1 2 3 2 SC70-5L (Top View) Revision 9/2000 1 5 4 www.semtech.com SMF05 & SMF12 PROTECTION PRODUCTS Absolute Maximum Rating R ating Peak Pulse Pow er (tp = 8/20ms) Peak Pulse Current (tp = 8/20ms) Peak Forw ard Voltage (IF = 1A, tp =8/20ms) ESD p er IEC 61000-4-2 (Air) ESD p er IEC 61000-4-2 (Contact) Lead Soldering Temp erature Op erating Temp erature Storage Temp erature Symbo l Pp k I PP V FP V ESD TL TJ TSTG Value 200 12 1.5 20 15 260 (10 seconds) -55 to +125 -55 to +150 Units Watts A V kV o C C C o o Electrical Characteristics SMF05 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 = 5V, T=25C IPP = 1A, tp = 8/20s IPP = 12A, tp = 8/20s Betw een I/O p ins and Gnd V R = 0V, f = 1MHz 150 6 10 9.5 12.5 175 Co nd itio ns Minimum Typ ical Maximum 5 Units V V A V V pF SMF12 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 = 12V, T=25C IPP = 1A, tp = 8/20s IPP = 8A, tp = 8/20s Betw een I/O p ins and Gnd V R = 0V, f = 1MHz 2 Co nd itio ns Minimum Typ ical Maximum 12 Units V V 13.3 1 19 25 60 75 A V V pF a 2000 Semtech Corp. www.semtech.com SMF05 & SMF12 PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time 10 Power Derating Curve 110 100 Peak Pulse Power - P PP (kW) 90 % of Rated Power or I PP 80 70 60 50 40 30 20 10 0.01 0.1 1 10 Pulse Duration - tp (s) 100 1000 1 0.1 0 0 25 50 75 100 125 150 Ambient Temperature - TA (oC) 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 Clamping Voltage vs. Peak Pulse Current 30 Clamping Voltage - V C (V) Waveform Parameters: tr = 8s td = 20s 25 20 SMF12 15 10 5 0 0 2 4 6 8 10 12 14 16 Peak Pulse Current - IPP (A) Waveform Parameters: tr = 8s td = 20s SMF05 SMF05 ESD Clamping (8kV Contact per IEC 61000-4-2) SMF12 ESD Clamping (8kV Contact per IEC 61000-4-2) a 2000 Semtech Corp. 3 www.semtech.com SMF05 & SMF12 PROTECTION PRODUCTS Applications Information Device Connection for Protection of Four Data Lines The SMFxx is designed to protect up to four unidirectional data lines. The device is connected as follows: 1. Unidirectional protection of four I/O lines is achieved by connecting pins 1, 3, 4, and 5 to the data lines. Pin 2 is connected to ground. The ground connection 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. SMF Circuit Diagram 1 3 4 5 2 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 Place the SMFxx near the input terminals or connectors to restrict transient coupling. l Minimize the path length between the SMSxx 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. Protection of Four Unidirectional Lines a 2000 Semtech Corp. 4 www.semtech.com SMF05 & SMF12 PROTECTION PRODUCTS Typical Applications a 2000 Semtech Corp. 5 www.semtech.com SMF05 & SMF12 PROTECTION PRODUCTS Outline Drawing - SC70-5L Land Pattern - SC70-5L a 2000 Semtech Corp. 6 www.semtech.com SMF05 & SMF12 PROTECTION PRODUCTS Marking Codes Par t Numbe r SMF05 SMF12 Mar king Co d e F05 F12 Note: (1) Pin 1 Identified with a dot Ordering Information Par t Numbe r SMF05.TC SMF05.TG SMF12.TC SMF12.TG Wo r king Vo ltage 5V 5V 12V 12V Qty p e r R e e l 3,000 10,000 3,000 10,000 R e e l Size 7 Inch 13 Inch 7 Inch 13 Inch 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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