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SI1302DL Folha de dados(PDF) 6 Page - Vishay Telefunken |
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SI1302DL Folha de dados(HTML) 6 Page - Vishay Telefunken |
6 / 9 page AN813 Vishay Siliconix Document Number: 71236 12-Dec-03 www.vishay.com 1 Single-Channel LITTLE FOOTR SC-70 3-Pin and 6-Pin MOSFET Recommended Pad Pattern and Thermal Peformance INTRODUCTION BASIC PAD PATTERNS This technical note discusses pin-outs, package outlines, pad patterns, evaluation board layout, and thermal performance for single-channel LITTLE FOOT power MOSFETs in the SC-70 package. These new Vishay Siliconix devices are intended for small-signal applications where a miniaturized package is needed and low levels of current (around 350 mA) need to be switched, either directly or by using a level shift configuration. Vishay provides these single devices with a range of on-resistance specifications and in both traditional 3-pin and new 6-pin versions. The new 6-pin SC-70 package enables improved on-resistance values and enhanced thermal performance compared to the 3-pin package. PIN-OUT Figure 1 shows the pin-out description and Pin 1 identification for the single-channel SC-70 device in both 3-pin and 6-pin configurations. The pin-out of the 6-pin device allows the use of four pins as drain leads, which helps to reduce on-resistance and junction-to-ambient thermal resistance. SOT-323 SC-70 (3-LEADS) 1 2 3 Top View G S D SOT-363 SC-70 (6-LEADS) 6 4 1 2 3 5 Top View D D G FIGURE 1. For package dimensions see outline drawings: SC-70 (3-Leads) (http://www.vishay.com/doc?71153) SC-70 (6-Leads) (http://www.vishay.com/doc?71154) See Application Note 826, Recommended Minimum Pad Patterns With Outline Drawing Access for Vishay Siliconix MOSFETs, (http://www.vishay.com/doc?72286) for the basic pad layout and dimensions for the 3-pin SC-70 and the 6-pin SC-70. These pad patterns are sufficient for the low-power applications for which this package is intended. Increasing the pad pattern has little effect on thermal resistance for the 3-pin device, reducing it by only 10% to 15%. But for the 6-pin device, increasing the pad patterns yields a reduction in thermal resistance on the order of 35% when using a 1-inch square with full copper on both sides of the printed circuit board (PCB). The availability of four drain leads rather than the traditional single drain lead allows a better thermal path from the package to the PCB and external environment. EVALUATION BOARDS FOR THE SINGLE SC70-3 AND SC70-6 Figure 2 shows the 3-pin and 6-pin SC-70 evaluation boards (EVB). Both measure 0.6 inches by 0.5 inches. Their copper pad traces are the same as described in the previous section, Basic Pad Patterns. Both boards allow interrogation from the outer pins to 6-pin DIP connections, permitting test sockets to be used in evaluation testing. The thermal performance of the single SC-70 has been measured on the EVB for both the 3-pin and 6-pin devices, the results shown in Figures 3 and 4. The minimum recommended footprint on the evaluation board was compared with the industry standard of 1-inch square FR4 PCB with copper on both sides of the board. FIGURE 2. Front of Board SC70-3 Front of Board SC70-6 Back of Board, SC70-3 and SC70-6 ChipFETr ChipFETr vishay.com |
Nº de peça semelhante - SI1302DL |
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Descrição semelhante - SI1302DL |
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