LCDA12C-1 and LCDA15C-1 Low Capacitance TVS Diode Array PRELIMINARY PROTECTION PRODUCTS Description Features The LCDAxxC-1 is a low capacitance transient voltage suppressor (TVS) diode array. It is designed to protect sensitive CMOS ICs from the damaging effects of ESD and lightning. Each device will protect one line in common (line-to-ground) mode or one line pair in metallic (Line-to-line) mode. They are low capacitance (< 15pF) making them suitable for use on high-speed telecom and datacom interfaces without signal degradation. The configuration of the LCDAxxC-1 has been optimized for easy layout on high density boards. The small SOT-143 package minimizes required board space. These devices will handle up to 20 Amps for an 8/20µs lightning impulse. The low inductance construction minimizes voltage overshoot during high current surges. The LCDAxxC-1 may be used to protect ADSL interfaces, multi-protocol serial transceivers, portable electronics, and wireless systems. Transient protection to high-speed data lines 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) Configuration optimized for easy board layout Protects one line pair Low capacitance (<15pF) for high-speed interfaces Low clamping voltage Low leakage current Operating voltage: 12V and 15V Solid-state silicon-avalanche technology Mechanical Characteristics JEDEC SOT-143 package Molding compound flammability rating: UL 94V-0 Marking : Marking code Packaging : Tape and Reel per EIA 481 RoHS/WEEE Compliant Applications Circuit Diagram ADSL Interfaces RS-232, RS-422, V.90 Interfaces Multi-Protocol Serial Transceivers High-Speed Data Lines Portable Electronics WAN/LAN Equipment Wireless Systems Schematic & PIN Configuration Pin 1 and 4 Pin 2 and 3 SOT-143 (Top View) Revision 01/15/03 1 www.semtech.com LCDA12C-1 and LCDA15C-1 PROTECTION PRODUCTS Absolute Maximum Rating R ating Symbol Value Units Peak Pulse Power (tp = 8/20µs) Pp k 500 Watts Lead Soldering Temperature TL 260 (10 sec.) °C Operating Temperature TJ -55 to +125 °C TSTG -55 to +150 °C Storage Temperature Electrical Characteristics LCDA12C-1 Parameter Symbol Conditions Minimum Typical Maximum Units 12 V Reverse Stand-Off Voltage VRWM Reverse Breakdown Voltage V BR It = 1mA Reverse Leakage Current IR VRWM = 12V, T=25°C 5 µA Clamp ing Voltage VC IPP = 5A, tp = 8/20µs 19 V Clamp ing Voltage VC IPP = 20A, tp = 8/20µs 26.6 V Peak Pulse Current IP P tp = 8/20µs 20 A Junction Cap acitance Cj Between I/O p ins and Ground VR = 0V, f = 1MHz 8 15 pF Typical Maximum Units 15 V 13.3 V LCDA15C-1 Parameter Symbol Conditions Minimum Reverse Stand-Off Voltage VRWM Reverse Breakdown Voltage V BR It = 1mA Reverse Leakage Current IR VRWM = 15V, T=25°C 5 µA Clamp ing Voltage VC IPP = 1A, tp = 8/20µs 24 V Clamp ing Voltage VC IPP = 15A, tp = 8/20µs 33 V Peak Pulse Current IP P tp = 8/20µs 15 A Junction Cap acitance Cj Between I/O p ins and Ground VR = 0V, f = 1MHz 15 pF 2005 Semtech Corp. 2 16.7 V 8 www.semtech.com LCDA12C-1 and LCDA15C-1 PRELIMINARY PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve 10 110 % of Rated Power or PI P Peak Pulse Power - Ppk (kW) 100 1 0.1 90 80 70 60 50 40 30 20 10 0 0.01 0.1 1 10 100 0 1000 25 50 Pulse Waveform 100 125 150 Clamping Voltage vs. Peak Pulse Current 110 28 100 26 Clamping Voltage - VC (V) 90 80 Percent of IPP 75 Ambient Temperature - TA (oC) Pulse Duration - tp (µs) 70 e -t 60 50 40 td = I PP /2 30 20 24 LCDA15C-1 22 20 18 LCDA12C-1 16 Waveform Parameters: tr = 8µs td = 20µs 14 12 10 10 0 0 5 10 15 20 25 0 30 5 10 15 20 25 Peak Pulse Current - IPP (A) T im e (µs) Capacitance vs. Reverse Voltage Capacitance - Cj (pF) 9 8.5 8 7.5 f=1MHz 7 0 1 2 3 4 5 6 7 8 9 10 11 12 Reverse Voltage - VR (V) 2005 Semtech Corp. 3 www.semtech.com LCDA12C-1 and LCDA15C-1 PROTECTION PRODUCTS Applications Information Device Connection for Metallic Protection of HighSpeed Data Lines The LCDAxxC-1 is designed to protect high-speed data lines from transient over-voltages which result from lightning and ESD. The device is designed to protect one line in common mode (Line-to-Ground) or one line pair in metallic (Line-to-Line) mode. For metallic mode protection, the input of line 1 is connected at pin 1 and the output is connected at pin 4. Likewise, the input of line 2 is connected at pin 2 and the output is connected at pin 3. For common mode protection, ground either pins 1 and 4 or pins 2 and 3. The ground connection should be made directly to the ground plane for best results. Line In 1 Line In 2 4 3 Line Out Line Out Figure 1 - Connection for Differential Protection (Line-to-Line) Line In ADSL Protection A typical ADSL protection circuit is shown in Figure 3. The LCDA12C-1 (or LCDA15C-1 for 15 volt drivers) is connected from each line to ground on the IC side of the line. They provide lightning and ESD protection for the sensitive line driver IC. 1 2 4 Line Out 3 Figure 2 - Connection for Common Mode Protection (Line-to-Ground) Matte Tin Lead Finish 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. 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 compared to the solder paste volume that is placed on the land pattern of the PCB, the reflow profile will be Figure 3 - ADSL Protection Circuit 2005 Semtech Corp. 4 www.semtech.com LCDA12C-1 and LCDA15C-1 PRELIMINARY PROTECTION PRODUCTS Outline Drawing - SOT-143 D A e H e/2 DIM 4 3 GAUGE PLANE SEATING PLANE B 0.25 C 1 L L1 E E1 c 0 DETAIL A 2 bxN e1 bbb A2 C A B A SEE DETAIL A SIDE VIEW A A1 A2 b b1 c D E E1 e e1 L L1 N 0 aaa bbb ccc DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX .035 - 1.22 .048 0.80 0.15 .006 0.013 .042 0.75 0.90 1.07 .020 0.30 0.51 .037 0.76 0.94 .008 0.08 0.20 .114 .120 2.80 2.90 3.04 .093 .104 2.10 2.37 2.64 .051 .055 1.20 1.30 1.40 .075 1.92 BSC .008 0.20 BSC .015 .020 .024 0.40 0.50 0.60 (.021) (0.54) 4 4 0° 8° 0° 8° .006 0.15 .008 0.20 .004 0.10 .031 .000 .029 .011 .029 .003 .110 .082 .047 ccc C 4X SEATING PLANE A1 b1 aaa C C A B NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H- 3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 4. REFERENCE JEDEC STD TO-253, VARIATION D. Land Pattern - SOT-143 X1 X1 Y DIM Z C E1 G E2 Y X2 C E1 E2 G X1 X2 Y Z DIMENSIONS INCHES MILLIMETERS (.087) .076 .068 .031 .039 .047 .055 .141 (2.20) 1.92 1.72 0.80 1.00 1.20 1.40 3.60 X1 NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. REFERENCE IPC-SM-782A 2005 Semtech Corp. 5 www.semtech.com LCDA12C-1 and LCDA15C-1 PROTECTION PRODUCTS Marking Codes Part Number Marking Code LCDA12C-1 12L LCDA15C-1 15L Ordering Information Part Number Lead Finish Qty per Reel R eel Size LCDA12C-1.TC SnPb 3,000 7 Inch LCDA15C-1.TC SnPb 3,000 7 Inch LCDA12C-1.TCT Pb Free 3,000 7 Inch LCDA15C-1.TCT Pb Free 3,000 7 Inch Contact Information Semtech Corporation Protection Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 2005 Semtech Corp. 6 www.semtech.com