| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | M74HC257M1R | HC258QUAD 2CHANNEL MULTIPLEXER 3-STATE, INVERTING HC257 QUAD 2 CHANNEL MULTIPLEXER 3-STATE | 265K |
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| 2 | M74HC257M1R | QUAD 2 CHANNEL MULTIPLEXER (3-STATE) | 202K |
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| 3 | M74HC257M1R | QUAD 2 CHANNEL MULTIPLEXER (3-STATE) | 202K |
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