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LCDA12C-1 & 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 SOT143 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
u ESD protection to IEC 61000-4-2, Level 4 u Lightning protection per IEC 61000-4-5 u u u u u u u u u u u
(20A, tp=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 & 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
Applications
u u u u u u u
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
Schematic & PIN Configuration
SOT-143 (Top View)
Revision 9/2000 1 www.semtech.com
LCDA12C-1 & LCDA15C-1
PROTECTION PRODUCTS Absolute Maximum Rating
R ating Peak Pulse Pow er (tp = 8/20 s) Peak Pulse Current (tp = 8/20 s) Lead Sold ering Temp erature Op erating Temp erature Storage Temp erature Symbo l Pp k I PP TL TJ TSTG Value 500 20 260 (10 sec.) -55 to +125 -55 to +150 Units Watts A C C C
Electrical Characteristics
LCDA12C-1 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 = 5A, tp = 8/20s IPP = 20A, tp = 8/20s Betw een I/O p ins and Gnd V R = 0V, f = 1MHz 8 13.3 5 19 26.6 15 Co nd itio ns Minimum Typ ical Maximum 12 Units V V A V V pF
LCDA15C-1 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 = 15V, T=25C IPP = 1A, tp = 8/20s IPP = 15A, tp = 8/20s Betw een I/O p ins and Gnd V R = 0V, f = 1MHz 8 16.7 5 24 33 15 Co nd itio ns Minimum Typ ical Maximum 15 Units V V A V V pF
a 2000 Semtech Corp.
2
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LCDA12C-1 & LCDA15C-1
PROTECTION PRODUCTS Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
10
110 100
PRELIMINARY
Power Derating Curve
Peak Pulse Power - P PP (kW)
% of Rated Power or IPP
90 80 70 60 50 40 30 20 10
1
0.1
0.01 0.1 1 10 Pulse Duration - tp (s) 100 1000
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
28
Waveform Parameters: tr = 8s td = 20s
26 Clamping Voltage - VC (V) 24 22 20 18 16 14 12 10 0 5 10 15 20 25 Peak Pulse Current - IPP (A) Waveform Parameters: tr = 8s td = 20s LCDA15C-1 LCDA12C-1
Variation of Capacitance vs. Reverse Voltage
9
8.5 Capacitance (pF)
8
7.5 f=1MHz 7 0 1 2 3 4 5 6 7 8 9 10 11 12 Reverse Voltage (V)
a 2000 Semtech Corp.
3
www.semtech.com
LCDA12C-1 & 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 & 4 or pins 2 & 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.
Line In 4 1 Line Out
Line In
2
3
Line Out
Figure 1 - Connection for Differential Protection (Line-to-Line)
Line Out
Line In
4 1
2
3
Figure 2 - Connection for Common Mode Protection (Line-to-Ground)
Figure 3 - ADSL Protection Circuit
a 2000 Semtech Corp. 4 www.semtech.com
LCDA12C-1 & LCDA15C-1
PROTECTION PRODUCTS Outline Drawing - SOT-143 PRELIMINARY
Notes: (1) Controlling dimension: Inch (unless otherwise specified). (2) Dimension A and B do not include mold protrusions. Mold protrusions are .006 max.
Land Pattern - SOT-143
a 2000 Semtech Corp.
5
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LCDA12C-1 & LCDA15C-1
PROTECTION PRODUCTS Marking Codes
Par t Numbe r LCDA12C-1 LCDA15C-1 Mar king Co d e 12L 15L
Ordering Information
Par t Numbe r LCDA12C-1.TC LCDA15C-1.TC Wo r king Vo ltage 12V 15V Qty p e r Reel 3,000 3,000 R e e l Size 7 Inch 7 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. 6 www.semtech.com

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