поискавой системы для электроныых деталей |
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LC03-6TBT датащи(PDF) 5 Page - Semtech Corporation |
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LC03-6TBT датащи(HTML) 5 Page - Semtech Corporation |
5 / 11 page 5 2008 Semtech Corp. www.semtech.com PROTECTION PRODUCTS LC03-6 Device Connection Options for Protection of Two High-Speed Data Lines The LC03-6 is designed to protect two high-speed data lines (one differential pair) from transient over-voltages which result from lightning and ESD. The device can be configured to protect in differential (Line-to-Line) and common (Line-to-Ground) mode. Data line inputs/ outputs are connected at pins 1 to 8, and 4 to 5 as shown. Pins 2, 3, 6, and 7 are connected to ground. These pins should be connected directly to a ground plane on the board for best results. The path length is kept as short as possible to minimize parasitic induc- tance. In applications where high common mode voltages are present, differential protection is achieved by leaving pins 2, 3, 6, and 7 not connected. T1/E1 Linecard Protection (Intra-Building) A typical T1/E1 linecard protection circuit is shown below. The LC03-6 is connected between Tip and Ring on the transmit and receive line pairs. It provides protection to metallic and common mode lightning surges per Bellcore 1089. This design takes advan- tage of the isolation of the transformer to suppress common mode surges. To complete the protection circuit, the RClamp3304N (or RClamp0504N for 5V supplies) is employed as the IC side protection ele- ment. This device helps prevent the transceiver from latching up by providing fine clamping of transients that are coupled through the transformer. For further information, reference Semtech application note AN97-10. T3/E3 and STS-1 Protection The LC03-6 can also be used to protect T3/E3 and STS-1 interfaces. The data lines from the BNC inter- face are run through the LC03-6 (i.e. enters at pin 1 and exits at pin 8) with the ground connection made at the other side of the device (pins 4 and 5). The center pins (2, 3, 6, and 7) are not connected. In this configu- ration, the LC03-6 adds less than 12pF of capacitance to each line and provides surge protection to 100A (tp=8/20 µs). Connection for Differential (Line-to-Line) and Common Mode Protection (Line-to-Ground) Connection for Differential Protection (Line-to-Line) Applications Information 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 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 - LC03-6TBT |
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Аналогичное описание - LC03-6TBT |
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