| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | M74HC221A | DUAL MONOSTABLE MULTIVIBRATOR | 295K |
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| 2 | M74HC221AB1R | DUAL MONOSTABLE MULTIVIBRATOR | 295K |
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| 3 | M74HC221AC1R | DUAL MONOSTABLE MULTIVIBRATOR | 295K |
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| 4 | M74HC221AF1R | DUAL MONOSTABLE MULTIVIBRATOR | 295K |
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| 5 | M74HC221AM1R | DUAL MONOSTABLE MULTIVIBRATOR | 295K |
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