| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | SN74LS21D | DUAL 4-INPUT POSITIVE-AND GATES | 521K |
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| 2 | SN74LS21D | DUAL 4-INPUT AND GATE | 120K |
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| 3 | SN74LS21DE4 | DUAL 4-INPUT POSITIVE-AND GATES | 521K |
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| 4 | SN74LS21DR | DUAL 4-INPUT POSITIVE-AND GATES | 521K |
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| 5 | SN74LS21DRE4 | DUAL 4-INPUT POSITIVE-AND GATES | 521K |
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