| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | 74HCT21 | Dual 4-input AND gate | 34K |
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| 2 | 74HCT21D | Dual 4-input AND Gate | 64K |
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| 3 | 74HCT21D-T | Dual 4-input AND Gate | 64K |
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| 4 | 74HCT21N | IC HIGH SPEED CMOS LOGIK N/DIP14 | 34K |
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