LCDA15C-6_06 SEMTECH | Alldatasheet
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Technical content
1 www.semtech.com PROTECTION PRODUCTS LCDA15C-6 Low Capacitance TVS Diode Array For Multi-mode Tranciever Protection Description Features Circuit Diagram Schematic & PIN Configuration Revision 08/15/06 The LCDA15C-6 has been specifically designed to protect sensitive components which are connected to data and transmission lines from over voltages caused by electrostatic discharge (ESD), electrical fast tran- sients (EFT), and lightning. The low capacitance array configuration of the LCDA15C-6 allows the user to protect six high-speed data or I/O lines. They may be used on systems operating from 5 to 15 Volts. The high surge capability (500W, tp=8/20µs) makes the LCDA15C-6 suitable for telecommunications systems operating in harsh tran- sient environments. The low inductance construction minimizes voltage overshoot during high current surges. The features of the LCDA15C-6 are ideal for protecting multi-protocol transceivers in WAN applications such as Frame Relay systems, routers, and switches.
Applications
Mechanical Characteristics Multi-Mode Transceiver Protection WAN Equipment: CSU/DSU Multiplexers Routers ISP Equipment Customer Premise Equipment Protection for any of the following interfaces: RS-232 (V.28) RS-449 (V.11/V.10) RS-485 Transient protection for high-speed data lines to IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns) IEC 61000-4-5 (Lightning) 0.5kV, 12A (8/20µs) Protects six I/O lines Low capacitance for high-speed interfaces High surge capability Low clamping voltage Solid-state silicon avalanche technology JEDEC SO-8 package Molding compound flammability rating: UL 94V-0 Marking : Part number, date code, logo Packaging : Tape and Reel per EIA 481 SO-8 (Top View) Pin 1 Pin 4 and 5
2 2005 Semtech Corp. www.semtech.com PROTECTION PRODUCTSPROTECTION PRODUCTS LCDA15C-6 Absolute Maximum Rating
Electrical Characteristics
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3 2005 Semtech Corp. www.semtech.com PROTECTION PRODUCTS LCDA15C-6 Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve Pulse Waveform Clamping Voltage vs. Peak Pulse Current 100 110 0 5 10 15 20 25 30 Time (µs) Percent of IPP e td = IPP/2 Waveform Parameters: tr = 8µs td = 20µs 100 110 0 25 50 75 100 125 150 175 Ambient Temperature - T A (oC) % of Rated Power or IPP 0.01 0.1 0.1 1 10 100 1000 Pulse Duration - tp (µs) Peak Pulse Power - Ppk (kW) 02468 1 0 1 2 1 4 1 6 Peak Pulse Current - I PP (A) Clamping Voltage - VC (V) Waveform Parameters: tr = 8µs td = 20µs Capacitance vs. Reverse Voltage 7.5 8.5 0123456789 1 0 1 1 1 2 Reverse Voltage - VR (V) Capacitance - Cj (pF) f=1MHz Line-to-Ground
4 2005 Semtech Corp. www.semtech.com PROTECTION PRODUCTSPROTECTION PRODUCTS LCDA15C-6 Device Connection Multi-Mode Tranceiver Protection Example Device Connection Options for Protection of Six High- Speed Data Lines The LCDA15C-6 may be configured to protect up to six I/O lines operating between 5 and 15V. It may be used to protect the most popular serial data interface standard lines making it ideal for use in equipment utilizing multi-mode transceivers. Data lines are connected at pins 1, 2, 3, 6, 7, and 8. Pins 4 and 5 are connected to ground. For best results, these pins should be connected directly to a ground plane on the board. The path length should be kept as short as possible to minimize parasitic inductance. Multi-Mode Transceiver Protection A typical multi-mode transceiver protection circuit is shown. The LCDA15C-6 is used to protect I/O lines with external connections. The LCDA15C-6 adds a maximum loading capacitance of 15pF with a working voltage of 15V. This allows the transceiver to safely operate in all modes without clipping or degradation of the signal. With proper design and layout, the transceiver port can be protected to >15kV (HBM per IEC 61000-4-2). Circuit Board Layout Recommendations for Suppres- sion of ESD. Good circuit board layout is critical for the suppression of fast rise-time transients such as ESD. The following guidelines are recommended: z Place the LCDA15C-6 near the input terminals or connectors to restrict transient coupling. z Minimize the path length between the LCDA15C-6 and the protected line. z Minimize all conductive loops including power and ground loops. z The ESD transient return path to ground should be kept as short as possible. z Never run critical signals near board edges. z Use ground planes whenever possible. Applications Information Matte Tin Lead Finish Matte tin has become the industry standard lead-free replacement for SnPb lead finishes. A matte tin finish is composed of 100% tin solder with large grains. Since the solder volume on the leads is small com- pared to the solder paste volume that is placed on the land pattern of the PCB, the reflow profile will be determined by the requirements of the solder paste. Therefore, these devices are compatible with both lead-free and SnPb assembly techniques. In addition, unlike other lead-free compositions, matte tin does not have any added alloys that can cause degradation of the solder joint.
5 2005 Semtech Corp. www.semtech.com PROTECTION PRODUCTS LCDA15C-6 Land Pattern - SO-8 Outline Drawing - SO-8 bxN 2X N/2 TIPS SEATING aaa C E/22X N A D bbb C A-B D ccc C e/2 SEE DETAIL A SIDE VIEW A B C De DETAIL A c L (L1) 01 0.25 GAGE PLANE h h H PLANE 3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. -B- CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). DATUMS AND TO BE DETERMINED AT DATUM PLANE NOTES: 2. -A- -H- REFERENCE JEDEC STD MS-012, VARIATION AA.4. .050 BSC .236 BSC .010 .150 .189 .154 .193 .012 - 0.25
1.27 BSC
6.00 BSC
3.90 4.90 .157 .197 3.80 4.80 .020 0.31 4.00 5.00 0.51 (.041) .004 .008 .028 .016 .007 .049 .004 .053 8° 0° 0.20 0.10 - 8° 0.40 0.17 1.25 0.10 .041 .010 .069 .065 .010 1.35 (1.04) 0.72 1.04 0.25 - 1.75 1.65 0.25 N bbb aaa ccc A b D E L h e c DIM MIN MILLIMETERS NOM DIMENSIONS INCHES MIN MAX MAX NOM E (.205) (5.20) ZG Y P (C) 3.00.118 1.27.050 0.60.024 2.20.087 7.40.291 X INCHES DIMENSIONS Z P Y X DIM C G MILLIMETERS THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. NOTES: REFERENCE IPC-SM-782A, RLP NO. 300A.2.
6 2005 Semtech Corp. www.semtech.com PROTECTION PRODUCTSPROTECTION PRODUCTS LCDA15C-6 Contact Information Semtech Corporation Protection Products Division 200 Flynn Rd., Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
Ordering Information
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