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Dual Low Capacitance TVS Array for Telecom Line-Card Applications
PROTECTION PRODUCTS Description
The LC05-6 has been specifically designed to protect sensitive components which are connected to highspeed telecommunications lines from over voltages caused by lightning, ESD (electrostatic discharge), and EFT (electrical fast transients). The device is in a JEDEC SO-16 NB package. It is designed to provide metallic surge protection for two tip & ring line pairs. The low capacitance topology means signal integrity is preserved on high-speed lines. The high surge capability (2000W, tp=8/20s) makes the LC05-6 suitable for telecommunications systems operating in harsh transient environments. The LC05-6 is designed to meet the lightning surge requirements of Bellcore GR-1089 (intra-building), ITU K.20, and IEC 61000-4-5. The features of the LC05-6 are ideal for protecting T1/E1 transceivers in WAN applications.
LC05-6
Features
u Transient protection for high-speed data lines to
Bellcore GR 1089 IPP=100A (2/10s) ITU K.20 IPP=40A (5/310s) IEC 61000-4-5 (Lightning) IPP=100A (8/20s) IEC 61000-4-2 (ESD) >25kV Protects two tip and ring line pairs Low capacitance for high-speed interfaces High surge capability Low clamping voltage Solid-state silicon avalanche technology
u u u u u u u u u
Mechanical Characteristics
JEDEC SO-16 package Molding compound flammability rating: UL 94V-0 Marking : Part number, date code, logo Packaging : Tube or Tape and Reel per EIA 481
Applications
u u u u u u u u
T1/E1 Line Cards Base Stations WAN Equipment CSU/DSU Multiplexers Routers ISP Equipment Customer Premise Equipment
Circuit Diagram
Schematic & PIN Configuration
TIP
RING
SO-16 (Top View)
Revision 9/2000 1 www.semtech.com
LC05-06
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 2000 100 260 (10 sec.) -55 to +125 -55 to +150 Units Watts A C C C
Electrical Characteristics
LC05-6 Par ame te r Reverse Stand -Off Voltage Reverse Breakd ow n Voltage Reverse Leakage Current Symbo l V RWM V BR IR It = 1mA V RWM = 6V, T=25C V RWM = 3V, T=25C Clamp ing Voltage Clamp ing Voltage Clamp ing Voltage Junction Cap acitance VC VC VC Cj IPP = 10A , tp = 10/1000 s IPP = 50A , tp = 8/20 s IPP = 100A , tp = 8/20 s Each Line V R = 0V, f = 1MHz 6.8 15 2 12.5 15 20 15 Co nd itio ns Minimum Typ ical Maximum 6 Units V V A A V V V pF
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LC05-06
PROTECTION PRODUCTS Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
100
Power Derating Curve
110 100
Peak Pulse Power - PPP (kW)
% of Rated Power or IPP
0.1 1 10 Pulse Duration - tp (s) 100 1000
90 80 70 60 50 40 30 20 10
10
1
0.1
0 0 25 50 75 100 125 Ambient Temperature - T A ( o C)
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
16
Waveform Parameters: tr = 8s td = 20s
14 Clamping Voltage - Vc (V) 12 10 8 6 4 2 0 0 20 40 60 80 100 Peak Pulse Current - Ipp (A) Waveform Parameters: tr = 8s td = 20s
Capacitance vs. Reverse Voltage
6 5 Capacitance (pF) 4 3 2 1 0 0 1 2 3 4 5 6 7 Reverse Voltage (V)
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LC05-06
PROTECTION PRODUCTS Applications Information
Device Connection Options for Protection of Two High-Speed Line Pairs The LC05-6 is designed to protect four high-speed data lines (two differential pairs) from transient over-voltages which result from lightning and ESD. Protection of two line pairs is achieved by connecting the device as follows: Pins 1-4 are connected to line 1 of the first pair (i.e. Tip 1) and pins 13-16 are connected to line 2 of the first pair (i.e. Ring 1). Pins 5-8 are connected to line 1 of the second pair (i.e. Tip 2) and pins 9-12 are connected to line two of the second pair (i.e. Ring 2). All pins should be connected for best results. Minimize parasitic inductance in the protection circuit path by keeping the trace length between the protected line and the LC05-6 as short as possible. T1/E1 Linecard Protection A typical T1/E1 linecard protection circuit is shown in Figure 2. The LC05-6 is connected between Tip & Ring on the transmit and receive line pairs. It provides protection to metallic (line-to-line) lightning and ESD surges. It is designed to meet the intra-building requirements of Bellcore GR-1089. This design takes advantage of the isolation of the transformer to suppress common mode surges. To complete the protection circuit, the SRDA05-4 (or SRDA3.3-4 for 3.3V supplies) is employed as the IC side protection element. This device helps prevent the transceiver from latching up by providing fine clamping of transients that are coupled through the transformer. Figure 1 - Connection for Differential (Line-to-Line) Protection of two Tip/Ring Line Pairs
TIP 1
RING 1
TIP 2
RING 2
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LC05-06
PROTECTION PRODUCTS Typical Applications
Figure 2 - T1 Line Card Protection
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LC05-06
PROTECTION PRODUCTS Outline Drawing - SO-16
Land Pattern - SO-16
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LC05-06
PROTECTION PRODUCTS Ordering Information
P ar t Numbe r LC05-6.TB LC05-6.TE Wo r king Vo ltage 6V 6V Qty p e r Reel 500 2500 R e e l Size 7 Inch 13 Inch
Note: (1) No suffix indicates tube pack.
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. 7 www.semtech.com

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