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型号	厂家	封装	批号	描述	日期

HD74LS258	Renesas			Logic	20080504
HD74LS257	Renesas			Logic	20080504
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
HD74LS257	Hitachi				20030213
T74LS257B1	ST Microelectronics			Logic IC	20030127
SK74LS257	Thomson Consumer Electronics			Logic IC	20030127
NTE74LS257	NTE Electronics			Logic IC	20030127
DV74LS257BN	AVG Semiconductor			Logic IC	20030127
DV74LS257BD	AVG Semiconductor			Logic IC	20030127
T74LS257D1	ST Microelectronics	DIP-16		2-Input Digital Multiplexer	20020807
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
SN74LS257ANDS	Motorola Semiconductor Products Inc	DIP-16		2-Input Digital Multiplexer	20020807
SN74LS257AND	Motorola Semiconductor Products Inc	DIP-16		2-Input Digital Multiplexer	20020807
SN74LS257AN	Motorola Semiconductor Products Inc	DIP-16		2-Input Digital Multiplexer	20020807
SN74LS257AJD	Motorola Semiconductor Products Inc	DIP-16		2-Input Digital Multiplexer	20020807
SN74LS257AJ	Motorola Semiconductor Products Inc	DIP-16		2-Input Digital Multiplexer	20020807
SN74LS257ADR2	Motorola Semiconductor Products Inc	SOP-16		2-Input Digital Multiplexer	20020807
SN74LS257AD	Motorola Semiconductor Products Inc	SOP-16		2-Input Digital Multiplexer	20020807
M74LS257AP	Mitsubishi Electronics America Inc	DIP-16		2-Input Digital Multiplexer	20020807
HD74LS257P	Hitachi America	DIP-16		2-Input Digital Multiplexer	20020807
HD74LS257	Hitachi America	DIP-16		2-Input Digital Multiplexer	20020807
DN74LS257AS	Matsushita. Panasonic	SOP-16		2-Input Digital Multiplexer	20020807
DN74LS257A	Matsushita. Panasonic	DIP-16		2-Input Digital Multiplexer	20020807
DM74LS257N/B+	National Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
DM74LS257N/A+	National Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
DM74LS257J/A+	National Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
DM74LS257BN/B+	National Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
DM74LS257BN/A+	National Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
DM74LS257BN	National Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
DM74LS257BN	Fairchild Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
DM74LS257BMX	Fairchild Semiconductor Corp	SOP-16		2-Input Digital Multiplexer	20020807
DM74LS257BM	National Semiconductor Corp	SOP-16		2-Input Digital Multiplexer	20020807
DM74LS257BM	Fairchild Semiconductor Corp	SOP-16		2-Input Digital Multiplexer	20020807
DM74LS257AN/B+	National Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
DM74LS257AN/A+	National Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
74LS257APC	Rochester Electronics Inc	DIP-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
T74LS257A	ST			[替换型号]SN74LS257A	20111231
T74LS257A	ST			[替换型号]SL74LS257A	20111231
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