型号 厂家 批号 封装    
s-a  s-b  s-c  s-d  s-e  s-f  s-g  s-h  s-i  s-j  s-k  s-l  s-m  s-n  s-o  s-p  s-q  s-r  s-s  s-t  s-u  s-v  s-w  s-x  s-y  s-z  s-0  s-1  s-2  s-3  s-4  s-5  s-6  s-7  s-8  s-9   
 74LS255D  74LS253SC  74LS253PC  74LS253P  74LS253NA
 74LS253N  74LS253MX  74LS253M  74LS253J /WP-90964L3  74LS253J
 74LS253DR  74LS253DC  74ls253d  74LS253BI  74LS253
 74LS251PCQR  74LS251PC  74LS251P  74LS251NS  74LS251N
 74LS251M  74LS251DC  74LS251D  74LS251BI  74LS251
 74LS25  74LS249PC  74LS249P  74LS249N  74LS249D
 74LS249  74LS248PC  74LS248P  74LS248BP  74LS248A
 74LS248  74LS247PC  74LS247P  74LS247N  74LS247D
 74LS247  74LS246  74LS245WP  74LS245WMX-SMD(1K REEL) D/C93  74LS245WMX SMD-TA
 74LS245WMX  74LS245WM  74LS245-SMD(GD74LS245D) D/C95  74LS245-SMD(DM74LS245WM)D/C97  74LS245-SMD D/C87
 74LS245SJX  74LS245SJ  74LS245SC  74LS245RPEL  74LS245PC
 74LS245P  74LS245NSR/5.2MM  74LS245NSR  74LS245NS  74LS245N
 74LS245MEL  74LS245J  74LS245FPE  74LS245DWR2  74LS245DWR/7.2MM
 74LS245DWR/7.2  74LS245DWR  74LS245DW  74LS245DJ  74LS245DC
 74LS245DBR  74LS245DBLE  74LS245D  74LS245CN  74LS245BJ
 74LS245B1  74LS245ADWF  74LS245AD  74LS245A  74LS245/7.2
 74LS245/5.2  74LS245(SMDSN74LS245DW) D/C00  74LS245 SMD-TA  74LS245 SMD  74LS245 SMD
 74LS245  74LS244WMX  74LS244WM  74LS244W  74LS244SJ
 74LS244SC  74LS244RP-EL  74LS244RPEL  74LS244RP  74LS244PTR(SMD) D/C03
 74LS244PTR  74LS244PREL  74LS244PC  74LS244P  74LS244NSR/5.2MM
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