LCDA24C-1.TCT

LCDA24C-1 

Low Capacitance TVS Array PRELIMINARY 

## **PROTECTION PRODUCTS** 

## Description 

The LCDA24C-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 LCDA24C-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 10 Amps for an 8/20µs lightning impulse.  The low inductance construction minimizes voltage overshoot during high current surges. 

The LCDA24C-1 may be used to protect ADSL interfaces, multi-protocol serial transceivers, portable electronics, and wireless systems. 

## 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, 10A (8/20µs) 

- Configuration optimized for easy board layout 

- Protects one line pair 

- Low capacitance (<10pF) for high-speed interfaces 

- Low clamping voltage 

- Low leakage current 

- Operating voltage: 24V 

- Solid-state silicon-avalanche technology 

## Mechanical Characteristics 

- JEDEC SOT-143 package 

- Lead Finish: Matte Tin 

- Molding compound flammability rating: UL 94V-0 

- Marking: Marking code 

- Packaging: Tape and Reel per EIA 481 

## Applications 

- ADSL Interfaces 

- RS-232, RS-422, V.90 Interfaces 

- Multi-Protocol Serial Transceivers 

- High-Speed Data Lines 

- Portable Electronics 

- WAN/LAN Equipment 

## Circuit Diagram 

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## Schematic & PIN Configuration 

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SOT-143 (Top View) 

www.semtech.com 

Revision 04/07/2004 

1 

LCDA24C-1 

## **PROTECTION PRODUCTS** 

## Absolute Maximum Rating 

|**PROTECTION PRODUCTS**<br>Absolute Maximum Rating|**PROTECTION PRODUCTS**<br>Absolute Maximum Rating|**PROTECTION PRODUCTS**<br>Absolute Maximum Rating||||||||
|---|---|---|---|---|---|---|---|---|---|
|g<br>nit<br>a<br>R|||l<br>o<br>b<br>m<br>y<br>S||e<br>ul<br>a<br>V|||s<br>ti<br>n<br>U||
|t(<br>r<br>e<br>w<br>o<br>P<br>e<br>slu<br>P<br>k<br>a<br>e<br>P<br>p<br>)s<br>µ<br>0<br>2<br>/<br>8<br>=|||P k<br>p||0<br>0<br>5|||stt<br>a<br>W||
|t(<br>t<br>n<br>e<br>rr<br>u<br>C<br>e<br>slu<br>P<br>k<br>a<br>e<br>P<br>p<br>)s<br>µ<br>0<br>2<br>/<br>8<br>=|||I P<br>P||0<br>1|||s<br>p<br>m<br>A||
|e<br>r<br>u<br>t<br>a<br>r<br>e<br>p<br>m<br>e<br>T<br>g<br>nit<br>a<br>r<br>e<br>p<br>O|||TJ||5<br>2<br>1<br>+<br>o<br>t<br>5<br>5<br>-|||C<br>°||
|e<br>r<br>u<br>t<br>a<br>r<br>e<br>p<br>m<br>e<br>T<br>e<br>g<br>a<br>r<br>o<br>t<br>S|||T<br>G<br>T<br>S||0<br>5<br>1<br>+<br>o<br>t<br>5<br>5<br>-|||C<br>°||
|Electrical Characteristics (T=25oC)||||||||||
|||||||||||
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|e<br>g<br>a<br>tlo<br>V<br>ff<br>O<br>-<br>d<br>n<br>a<br>t<br>S<br>e<br>sr<br>e<br>v<br>e<br>R|V<br>M<br>W<br>R||||||4<br>2||V|
|e<br>g<br>a<br>tlo<br>V<br>n<br>w<br>o<br>d<br>k<br>a<br>e<br>r<br>B<br>e<br>sr<br>e<br>v<br>e<br>R|V R<br>B|It<br>A<br>m<br>1<br>=||7<br>.<br>6<br>2|||||V|
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|e<br>g<br>a<br>tlo<br>V<br>g<br>nip<br>m<br>alC|VC|I P<br>P<br>t<br>,<br>A<br>1<br>=<br>p<br>s<br>µ<br>0<br>2<br>/<br>8<br>=|||||3<br>4||V|
|e<br>g<br>a<br>tlo<br>V<br>g<br>nip<br>m<br>alC|VC|I P<br>P<br>t<br>,<br>A<br>0<br>1<br>=<br>p<br>s<br>µ<br>0<br>2<br>/<br>8<br>=|||||0<br>5||V|
|t<br>n<br>e<br>rr<br>u<br>C<br>e<br>slu<br>P<br>k<br>a<br>e<br>P|I P<br>P|tp<br>s<br>µ<br>0<br>2<br>/<br>8<br>=|||||0<br>1||A|
|e<br>c<br>n<br>a<br>tic<br>a<br>p<br>a<br>C<br>n<br>oitc<br>n<br>u<br>J|Cj|d<br>n<br>a<br>s<br>nip<br>O<br>/I<br>n<br>e<br>e<br>w<br>t<br>e<br>B<br>d<br>n<br>u<br>o<br>r<br>G<br>VR<br>z<br>H<br>M<br>1<br>=<br>f<br>,V<br>0<br>=|||||0<br>1||F<br>p|



www.semtech.com 

 2004 Semtech Corp. 

2 

LCDA24C-1 

PRELIMINARY 

**PROTECTION PRODUCTS** 

## Typical Characteristics 

## Non-Repetitive Peak Pulse Power vs. Pulse Time 

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**----- Start of picture text -----**<br>
10<br>1<br>0.1<br>0.01<br>0.1 1 10 100 1000<br>Pulse Duration - tp (µs)<br>Pulse Waveform<br>110<br>100<br>90<br>80<br>70<br>e [-t]<br>60<br>50<br>40 td = IPP/2<br>30<br>20<br>10<br>0<br>0 5 10 15 20 25 30<br>Tim e (µs)<br> (kW)<br>pk<br>Peak Pulse Power - P<br>PP<br>Percent of I<br>**----- End of picture text -----**<br>


## Power Derating Curve 

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**----- Start of picture text -----**<br>
110<br>100<br>90<br>80<br>70<br>60<br>50<br>40<br>30<br>20<br>10<br>0<br>0 25 50 75 100 125 150<br>Ambient Temperature - TA ( [o] C)<br>PP<br>% of Rated Power or I<br>**----- End of picture text -----**<br>


Clamping Voltage vs. Peak Pulse Current 

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**----- Start of picture text -----**<br>
55<br>50<br>45<br>40<br>35<br>Waveform:<br>tr = 8µs<br>td = 20µs<br>30<br>0 1 2 3 4 5 6 7 8 9 10<br>Peak Pulse Current - IPP (A)<br> (V)Clamping Voltage - VC<br>**----- End of picture text -----**<br>


Capacitance vs. Reverse Voltage 

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**----- Start of picture text -----**<br>
4.8<br>f - 1 MHz<br>4.7<br>4.6<br>4.5<br>4.4<br>4.3<br>4.2<br>0 5 10 15 20 25<br>Reverse Voltage - VR (V)<br> (pF)Capacitance - Cj<br>**----- End of picture text -----**<br>


www.semtech.com 

 2004 Semtech Corp. 

3 

LCDA24C-1 

## **PROTECTION PRODUCTS** 

## Applications Information 

## Device Connection for Metallic Protection of HighSpeed Data Lines 

The LCDA24C-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.  A protection device with an operating voltage of 270 volts is connected on the line side of the circuit.  A high voltage device is used due to the presence of the ring signal.  Secondary IC side protection is achieved with low voltage TVS devices.  The LCDA24C-1 is connected between to transmit line pairs.  Since the LCDA24C-1 has a working voltage of 24 volts, it may be used on pairs with signal swings as high as +/-12 volts.  The SD05C is used to protect the receive pairs. The signal swings on these lines can be as high as +/5 volts. 

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**----- Start of picture text -----**<br>
Line<br>Line 4 Out<br>1<br>In<br>Line 2 3 Line<br>In Out<br>**----- End of picture text -----**<br>


Figure 1 - Connection for Differential Protection (Line-to-Line) 

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**----- Start of picture text -----**<br>
Line<br>Line 4 Out<br>1<br>In<br>2 3<br>**----- End of picture text -----**<br>


Figure 2 - Connection for Common Mode Protection (Line-to-Ground) 

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Figure 3 - Typical ADSL Protection Circuit 

www.semtech.com 

 2004 Semtech Corp. 

4 

LCDA24C-1 

## **PROTECTION PRODUCTS** 

PRELIMINARY 

## Outline Drawing - SOT-143 

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**----- Start of picture text -----**<br>
  Notes:<br>**----- End of picture text -----**<br>


(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 

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www.semtech.com 

 2004 Semtech Corp. 

5 

LCDA24C-1 

## **PROTECTION PRODUCTS** 

## Device Marking 

24L 

## Ordering Information 

|r<br>e<br>b<br>m<br>u<br>N<br>tr<br>a<br>P|g<br>n<br>i<br>k<br>r<br>o<br>W<br>e<br>g<br>a<br>tl<br>o<br>V|r<br>e<br>p<br>y<br>t<br>Q<br>l<br>e<br>e<br>R|e<br>zi<br>S<br>l<br>e<br>e<br>R|
|---|---|---|---|
|T<br>C<br>T.<br>1<br>-<br>C<br>4<br>2<br>A<br>D<br>C<br>L|V<br>4<br>2|0<br>0<br>0<br>,<br>3|h<br>c<br>nI<br>7|



## Contact Information 

Semtech Corporation Protection Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111   FAX (805)498-3804 

www.semtech.com 

 2004 Semtech Corp. 

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