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| LCDA12C-1 and LCDA15C-1 Low Capacitance TVS Diode Array PROTECTION PRODUCTS Description 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 8/20s 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. PRELIMINARY Features 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 (8/20s) 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 ADSL Interfaces RS-232, RS-422, V.90 Interfaces Multi-Protocol Serial Transceivers High-Speed Data Lines Portable Electronics WAN/LAN Equipment Wireless Systems Circuit Diagram Pin 1 and 4 Schematic & PIN Configuration 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 Peak Pulse Power (tp = 8/20s) Lead Soldering Temperature Operating Temperature Storage Temperature Symbol Pp k TL TJ TSTG Value 500 260 (10 sec.) -55 to +125 -55 to +150 Units Watts C C C Electrical Characteristics LCDA12C-1 Parameter Reverse Stand-Off Voltage Reverse Breakdown Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Peak Pulse Current Junction Cap acitance Symbol VRWM V BR IR VC VC IP P Cj It = 1mA VRWM = 12V, T=25C IPP = 5A, tp = 8/20s IPP = 20A, tp = 8/20s tp = 8/20s Between I/O p ins and Ground VR = 0V, f = 1MHz 8 13.3 5 19 26.6 20 15 Conditions Minimum Typical Maximum 12 Units V V A V V A pF LCDA15C-1 Parameter Reverse Stand-Off Voltage Reverse Breakdown Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Peak Pulse Current Junction Cap acitance Symbol VRWM V BR IR VC VC IP P Cj It = 1mA VRWM = 15V, T=25C IPP = 1A, tp = 8/20s IPP = 15A, tp = 8/20s tp = 8/20s Between I/O p ins and Ground VR = 0V, f = 1MHz 2 Conditions Minimum Typical Maximum 15 Units V V 16.7 5 24 33 15 8 15 A V V A pF 2005 Semtech Corp. www.semtech.com LCDA12C-1 and LCDA15C-1 PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time 10 Peak Pulse Power - Ppk (kW) PRELIMINARY Power Derating Curve 110 100 % of Rated Power or PP I 90 80 70 60 50 40 30 20 10 0 1 0.1 0.01 0.1 1 10 Pulse Duration - tp (s) 100 1000 0 25 50 75 100 125 150 Ambient Temperature - TA (oC) Pulse Waveform 110 100 Clamping Voltage vs. Peak Pulse Current 28 26 Clamping Voltage - VC (V) 24 22 20 18 16 14 12 10 Waveform Parameters: tr = 8s td = 20s 0 5 10 15 20 25 LCDA12C-1 LCDA15C-1 90 80 Percent of IPP 70 60 50 40 30 20 10 0 0 5 10 15 T im e (s) 20 25 30 td = I PP /2 e -t Peak Pulse Current - IPP (A) Capacitance vs. Reverse Voltage 9 Capacitance - Cj (pF) 8.5 8 7.5 f=1M z H 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. 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. 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 compared to the solder paste volume that is placed on the land pattern of the PCB, the reflow profile will be Line In 1 4 Line Out Line In 2 3 Line Out Figure 1 - Connection for Differential Protection (Line-to-Line) Line In 1 4 Line Out 2 3 Figure 2 - Connection for Common Mode Protection (Line-to-Ground) 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. Figure 3 - ADSL Protection Circuit 2005 Semtech Corp. 4 www.semtech.com LCDA12C-1 and LCDA15C-1 PROTECTION PRODUCTS Outline Drawing - SOT-143 D e e/2 4 3 B A H PRELIMINARY DIM SEATING PLANE C GAUGE PLANE 0.25 L L1 DETAIL A 0 c DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX .031 .000 .029 .011 .029 .003 .110 .082 .047 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 .035 - E1 E 1 e1 2 bxN bbb CAB SIDE VIEW SEE DETAIL A A A1 A2 b b1 c D E E1 e e1 L L1 N 0 aaa bbb ccc A2 A 4X ccc C SEATING PLANE b1 aaa CAB A1 C NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -BTO BE DETERMINED AT DATUM PLANE -H3. 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 G E1 E2 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 Y X2 NOTES: X1 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 LCDA12C-1 LCDA15C-1 Marking Code 12L 15L Ordering Information Part Number LCDA12C-1.TC LCDA15C-1.TC LCDA12C-1.TCT LCDA15C-1.TCT Lead Finish SnPb SnPb Pb Free Pb Free Qty per Reel 3,000 3,000 3,000 3,000 R eel Size 7 Inch 7 Inch 7 Inch 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 |
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