поискавой системы для электроныых деталей |
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LC04-6 датащи(PDF) 4 Page - Semtech Corporation |
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LC04-6 датащи(HTML) 4 Page - Semtech Corporation |
4 / 7 page 4 2005 Semtech Corp. www.semtech.com PROTECTION PRODUCTS LC04-6 Figure 1 - Connection for Differential (Line-to-Line) Protection of two Tip/Ring Line Pairs Device Connection Options for Protection of Two High-Speed Line Pairs The LC04-6 is designed to protect four high-speed data lines (two differential pairs) from transient over-volt- ages 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 LC04-6 as short as possible. T1/E1 Linecard Protection A typical T1/E1 linecard protection circuit is shown in Figure 2. The LC04-6 is connected between Tip and 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 re- quirements of Bellcore GR-1089. This design takes advantage of the isolation of the transformer to suppress common mode surges. The LC04-6 may also be configured to meet metallic surges of FCC Part68 when used in conjunction with a 5 Ω (minimum) PTC or line feed resistor (LFR). The PTC (or LFR + fuse) are required to meet the AC power cross requirements, but will also reduce the effective surge current to levels within the capability of the LC04-6 (Table 1). To com- plete 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. The versatility of the LC04-6 makes it ideal for use with combination long haul/short haul T1/E1 transceivers. TIP 1 TIP 2 RING 1 RING 2 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 - LC04-6 |
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Аналогичное описание - LC04-6 |
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