SLVDA2.8.TBT

SLVDA2.8 Low Voltage TVS Diode Array For ESD & Latch-Up Protection PROTECTION PRODUCTS Description Features The SLV series of transient voltage suppressors are designed to protect low voltage semiconductor components which are connected to data and transmission lines from transients caused by electrostatic discharge (ESD), lightning and other induced voltage surges. The devices are constructed using Semtech’s proprietary EPD process technology. The EPD process provides low standoff voltages with significant reductions in leakage currents and capacitance over silicon avalanche diode processes. The SLV series is specifically designed for protecting low voltage components such as microprocessors, ASICs, I/O transceivers, and high speed RAM. They provide ESD and latch-up protection for power and I/O ports, microprocessor bus interfaces, high speed data and video transmission lines, and low power portable and wireless systems. The SLV series TVS diodes will meet the surge requirements of IEC 61000-4-2, Level 4, “Human Body Model” for air and contact discharge. The low clamping voltage of the SLV minimizes the stress on the protected transceiver. The SO-8 package allows flexibility in the design of “crowded” circuit boards. u 300 watts peak pulse power (tp = 8/20µs) u Transient protection for data lines to u u 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) 12A (1.2/50µs) Protects up to four bidirectional lines Working Voltages: 2.8V & 3.3V Low leakage current for low power applications Low operating voltage ideal for latch-up protection Low capacitance Low clamping voltage Solid-state EPD TVS 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 u u u u u Circuit Diagram (Each Line) ESD and Latch-Up Protection Analog Inputs WAN/LAN Equipment Low Voltage ASICs Instrumentation Low Power Systems Schematic & PIN Configuration 1 8 2 7 3 6 4 5 S0-8 (Top View) Revision 9/2000 1 www.semtech.com SLVDA2.8 PROTECTION PRODUCTS Absolute Maximum Rating R ating Symbo l Value Units Peak Pulse Pow er (tp = 8/20µ s) Pp k 300 Watts Peak Pulse Current (tp = 8/20µ s) I PP 24 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 SLVDA2.8 Par ame te r Reverse Stand -Off Voltage Symbo l Co nd itio ns Minimum V RWM Typ ical Maximum Units 2.8 V Punch -Th rough Voltage V PT IPT = 2µ A 3.0 V Snap -Back Voltage V SB ISB = 50mA 2.8 V Reverse Leakage Current IR V RWM = 2.8V, T=25°C 1 µA Clamp ing Voltage VC IPP = 1A , tp = 8/20µ s 4.1 V Clamp ing Voltage VC IPP = 5A , tp = 8/20µ s 5.3 V Maximum Peak Pulse Current I PP tp = 8/20µ s 24 A Junction Cap acitance Cj Betw een I/O Pins and Gnd V R = 0V, f = 1MHz 100 pF ã 2000 Semtech Corp. 2 www.semtech.com SLVDA2.8 PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve 110 10 90 % of Rated Power or I PP 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. 3 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 SLVDA2.8 PROTECTION PRODUCTS Applications Information I/O Line Protection Device Connection for Protection of Four Data Lines The SLVDA series devices are designed to protect up to four data lines. The devices are connected as follows: l l LINE 1 LINE 2 LINE 3 LINE 4 Common mode protection of four data lines is achieved by connecting data lines at pins 1 - 4. Pins 5 - 8 are connected to ground (Device is symmetrical so connections may be reversed to serve a specific application). 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. Protecting 5V lines: The designer may take advantage of the superior reverse leakage and capacitance characteristics of the SLVDA2.8 to protect two 5V lines. This is achieved by connecting two lines of the device in series as shown. The series connection is made by shorting pins 5 & 6 together for the first line and pins 7 & 8 for the second line. Pins 1 & 4 are connected to the lines that are to be protected. Pins 2 & 3 are connected to ground. See application note SI96-14 for additional details. Typical Connection To Protected Device 1 8 Circuit Board Layout Recommendations for Suppression of ESD. 2 7 Good circuit board layout is critical for the suppression of ESD induced transients. The following guidelines are recommended: 3 6 4 5 l l l l l l 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. ã 2000 Semtech Corp. From Connector Optional Connection for Protecting 5V Lines 4 www.semtech.com SLVDA2.8 PROTECTION PRODUCTS Outline Drawing - SO-8 Land Pattern SOT 143 Land Pattern - SO-8 ã 2000 Semtech Corp. 5 www.semtech.com SLVDA2.8 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 SLV DA 2.8.TC 2.8V 500 7 Inch Note: Consult factory for availability of 13” 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. 6 www.semtech.com