| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 | 
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| 1 | PI74FCT521 | Fast CMOS 8-Bit Identity Comparator | 45K | 
		     
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| 2 | PI74FCT521 | Fast CMOS 8-Bit Identity Comparator | 45K | 
		     
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| 3 | PI74FCT521ATL | Identity Comparator | 194K | 
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| 4 | PI74FCT521ATP | Identity Comparator | 194K | 
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| 5 | PI74FCT521ATQ | Identity Comparator | 194K | 
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| 6 | PI74FCT521ATR | Identity Comparator | 194K | 
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| 7 | PI74FCT521ATS | Identity Comparator | 194K | 
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| 8 | PI74FCT521BTL | Identity Comparator | 194K | 
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| 9 | PI74FCT521BTP | Identity Comparator | 194K | 
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| 10 | PI74FCT521BTQ | Identity Comparator | 194K | 
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| 11 | PI74FCT521BTR | Identity Comparator | 194K | 
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| 12 | PI74FCT521BTS | Identity Comparator | 194K | 
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| 13 | PI74FCT521CTL | Identity Comparator | 194K | 
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| 14 | PI74FCT521CTP | Identity Comparator | 194K | 
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| 15 | PI74FCT521CTQ | Identity Comparator | 194K | 
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| 16 | PI74FCT521CTR | Identity Comparator | 194K | 
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| 17 | PI74FCT521CTS | Identity Comparator | 194K | 
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| 18 | PI74FCT521DTL | Identity Comparator | 194K | 
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| 19 | PI74FCT521DTP | Identity Comparator | 194K | 
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| 20 | PI74FCT521DTQ | Identity Comparator | 194K | 
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| 21 | PI74FCT521DTR | Identity Comparator | 194K | 
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| 22 | PI74FCT521DTS | Identity Comparator | 194K | 
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| 23 | PI74FCT521T | Fast CMOS 8-Bit Identity Comparator | 45K | 
		     
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| 24 | PI74FCT521T | Fast CMOS 8-Bit Identity Comparator | 45K | 
		     
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| 25 | PI74FCT521TL | Identity Comparator | 194K | 
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| 26 | PI74FCT521TP | Identity Comparator | 194K | 
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| 27 | PI74FCT521TQ | Identity Comparator | 194K | 
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| 28 | PI74FCT521TR | Identity Comparator | 194K | 
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| 29 | PI74FCT521TS | Identity Comparator | 194K | 
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