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型号	厂家	封装	描述	日期

SN74LS257B	TI		Quadruple 2-Line To 1-Line Data Selectors/Multiplexers With 3-State Outputs	20030913
SN74LS257B	TI		Quadruple 2-Line To 1-Line Data Selectors/Multiplexers With 3-State Outputs	20030913
SN74LS257BN	Texas Instruments Inc	DIP-16	2-Input Digital Multiplexer	20020807
SN74LS257BN	ON Semiconductor	DIP-16	2-Input Digital Multiplexer	20020807
SN74LS257BMEL	ON Semiconductor	SOP-16	2-Input Digital Multiplexer	20020807
SN74LS257BM	ON Semiconductor	SOP-16	2-Input Digital Multiplexer	20020807
SN74LS257BJ	Motorola Semiconductor Products Inc	DIP-16	2-Input Digital Multiplexer	20020807
SN74LS257BDR2	ON Semiconductor	SOP-16	2-Input Digital Multiplexer	20020807
SN74LS257BD	Texas Instruments Inc	SOP-16	2-Input Digital Multiplexer	20020807
SN74LS257BD	ON Semiconductor	SOP-16	2-Input Digital Multiplexer	20020807
SN74LS257B/D	Onsemi		Quad 2-Input Multiplexer with 3-State Outputs	20010820
T74LS257A	ST		[替换型号]SN74LS257B	20111231
T74LS257A	ST		[替换型号]SN74LS257B	20111231
SN74LS257B	TI		[替换型号]T74LS257A	20111231
SN74LS257B	TI		[替换型号]SN74LS257B	20111231
SN74LS257B	TI		[替换型号]SN74LS257A	20111231
SN74LS257B	TI		[替换型号]SL74LS257A	20111231
SN74LS257B	TI		[替换型号]NTE74LS257	20111231
SN74LS257B	TI		[替换型号]GD74LS257A	20111231
SN74LS257B	TI		[替换型号]DV74LS257B	20111231
SN74LS257B	TI		[替换型号]DM74LS257B	20111231
SN74LS257B	TI		[替换型号]DM74LS257	20111231
SN74LS257B	TI		[替换型号]DM74LS257	20111231
SN74LS257B	TI		[替换型号]74LS257	20111231
SN74LS257B	TI		[替换型号]74LS257	20111231
M74LS257AP			[替换型号]Replacement:8210040 443-802 74LS257 74LS257A 74LS257AN 74LS257APC 74LS257DC 74LS257N 74LS257PC 901521-57 9334DC 9334DM C74LS257P DM74LS257BN EAQOO-23600 ECG74LS257 HD74LS257 HD74LS257P HE-443-1037 HE-443-802 HEPC74LS257P M74LS257AP MB74LS257 MB74LS257M N74LS257AF N74LS257AN NTE74LS257 SK74LS257 SN74LS257 SN74LS257AJ SN74LS257AJD SN74LS257AJDS SN74LS257AJS SN74LS257AN SN74LS257AND SN74LS257ANDS SN74LS257ANS SN74LS257BN SN74LS257J SN74LS257N SN74LS257X T74LS257B1 TCG74LS257	20111231
ECG74LS257	Philips		[替换型号]SN74LS257BN	20111231
DM74LS257B	Fairchild		[替换型号]SN74LS257B	20111231
DM74LS257B	Fairchild		[替换型号]SN74LS257B	20111231
DM74LS257	NS		[替换型号]SN74LS257B	20111231
DM74LS257	NS		[替换型号]SN74LS257B	20111231
DM74LS257	Fairchild		[替换型号]SN74LS257B	20111231
74LS257A	Philips		[替换型号]SN74LS257B	20111231
74LS257A	Philips		[替换型号]SN74LS257B	20111231
74LS257	ST		[替换型号]SN74LS257B	20111231
74LS257	ST		[替换型号]SN74LS257B	20111231
SN74LS257B	TI		[替换型号]DIRECT Replacement with Renesas Technology Corp. HD74LS257	20060602
SN74LS257B	TI		[替换型号]DIRECT Replacement with On Semiconductor SN74LS257B	20060602
SN74LS257B	TI		[替换型号]DIRECT Replacement with Fairchild Semiconductor DM74LS257B	20060602
SN74LS257B	TI		[替换型号]DIRECT Replacement with Fairchild Semiconductor 74LS257A	20060602
SN54LS257B	TI		[替换型号]DIRECT Replacement with On Semiconductor SN74LS257B	20060602
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