| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | DM74S251 | TRI-STATE 1 of 8 Line Data Selector/Multiplexer | 124K |
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| 2 | DM74S251J/A+ | 8-Input Digital Multiplexer | 106K |
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| 3 | DM74S251N/A+ | 8-Input Digital Multiplexer | 106K |
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| 4 | DM74S251N/B+ | 8-Input Digital Multiplexer | 106K |
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