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LCDA12C-1 датащи(PDF) 4 Page - Semtech Corporation |
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LCDA12C-1 датащи(HTML) 4 Page - Semtech Corporation |
4 / 6 page 4 2005 Semtech Corp. www.semtech.com PROTECTION PRODUCTS PROTECTION PRODUCTS LCDA12C-1 and LCDA15C-1 Applications Information Device Connection for Metallic Protection of High- Speed 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 con- nected 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 com- pared 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 1 2 3 4 Line In Line In Line Out Line Out Figure 1 - Connection for Differential Protection (Line-to-Line) 1 2 3 4 Line In Line Out 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. |
Аналогичный номер детали - LCDA12C-1 |
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Аналогичное описание - LCDA12C-1 |
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