| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | 74VHC221AM | Dual Non-Retriggerable Monostable Multivibrator | 103K |
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| 2 | 74VHC221AMTC | Dual Non-Retriggerable Monostable Multivibrator | 103K |
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| 3 | 74VHC221AMTCX | Monostable Multivibrator | 103K |
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| 4 | 74VHC221AMX | Monostable Multivibrator | 103K |
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