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型号	厂家	封装	批号	描述	日期

M74HC257	ST			QUAD 2 CHANNEL MULTIPLEXER (3-STATE)	20031102
M74HC257B1R				IC-74HC SERIES CMOS	20030108
MM74HC257N/B+	National Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
MM74HC257N/A+	National Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
MM74HC257N	Fairchild Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
MM74HC257M/A+	National Semiconductor Corp	SOP-16		2-Input Digital Multiplexer	20020807
MM74HC257J/A+	National Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
MM74HC257J	National Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
MM74HC257J	Fairchild Semiconductor Corp	DIP-16		2-Input Digital Multiplexer	20020807
M74HC257P	Mitsubishi Electronics America Inc	DIP-16		2-Input Digital Multiplexer	20020807
M74HC257M1R	ST Microelectronics	SOP-16		2-Input Digital Multiplexer	20020807
M74HC257M1	ST Microelectronics	SOP-16		2-Input Digital Multiplexer	20020807
M74HC257FP	Mitsubishi Electronics America Inc	SOP-16		2-Input Digital Multiplexer	20020807
M74HC257F1	ST Microelectronics	DIP-16		2-Input Digital Multiplexer	20020807
M74HC257DP	Mitsubishi Electronics America Inc	SOP-16		2-Input Digital Multiplexer	20020807
M74HC257C1R	ST Microelectronics	LDCC-20		2-Input Digital Multiplexer	20020807
M74HC257C1	ST Microelectronics	LDCC-20		2-Input Digital Multiplexer	20020807
M74HC257B1R	ST Microelectronics	DIP-16		2-Input Digital Multiplexer	20020807
M74HC257B1N	ST Microelectronics	DIP-16		2-Input Digital Multiplexer	20020807
M74HC257RM13TR	ST			[替换型号]Pin-to-Pin Replacement:Philips 74HC257D-T	20120119
M74HC257M1R	ST			[替换型号]Pin-to-Pin Replacement:Philips 74HC257D	20120119
M74HC257B1R	ST			[替换型号]Pin-to-Pin Replacement:Philips 74HC257N	20120119
TC74HC257AP	Toshiba			[替换型号]Pin-to-Pin Replacement:ST M74HC257B1R	20120118
TC74HC257AFN-ELP	Toshiba			[替换型号]Pin-to-Pin Replacement:ST M74HC257RM13TR	20120118
TC74HC257AFN	Toshiba			[替换型号]Pin-to-Pin Replacement:ST M74HC257M1R	20120118
SN74HC257N	TI			[替换型号]Pin-to-Pin Replacement:ST M74HC257B1R	20120118
SN74HC257DR	TI			[替换型号]Pin-to-Pin Replacement:ST M74HC257RM13TR	20120118
SN74HC257D	TI			[替换型号]Pin-to-Pin Replacement:ST M74HC257M1R	20120118
HD74HC257P	Renesas			[替换型号]Pin-to-Pin Replacement:ST M74HC257B1R	20120118
HD74HC257FPEL	Renesas			[替换型号]Pin-to-Pin Replacement:ST M74HC257RM13TR	20120118
HD74HC257FP	Renesas			[替换型号]Pin-to-Pin Replacement:ST M74HC257M1R	20120118
CD74HC257M96	TI			[替换型号]Pin-to-Pin Replacement:ST M74HC257RM13TR	20120118
CD74HC257M	TI			[替换型号]Pin-to-Pin Replacement:ST M74HC257M1R	20120118
CD74HC257E	TI			[替换型号]Pin-to-Pin Replacement:ST M74HC257B1R	20120118
74HC257N	Philips			[替换型号]Pin-to-Pin Replacement:ST M74HC257B1R	20120118
74HC257D-T	Philips			[替换型号]Pin-to-Pin Replacement:ST M74HC257RM13TR	20120118
74HC257D	Philips			[替换型号]Pin-to-Pin Replacement:ST M74HC257M1R	20120118
SN74HC257	TI			[替换型号]MM74HC257	20111231
MM74HC257	Fairchild			[替换型号]TC74HC257A	20111231
MM74HC257	Fairchild			[替换型号]SN74HC257	20111231
MM74HC257	Fairchild			[替换型号]NTE74HC257	20111231
MM74HC257	Fairchild			[替换型号]M74HC257	20111231
MM74HC257	Fairchild			[替换型号]GD74HC257	20111231
MM74HC257	Fairchild			[替换型号]DV74HC257	20111231
MM74HC257	Fairchild			[替换型号]CD74HC257	20111231
MM74HC257	Fairchild			[替换型号]74HC257	20111231
M74HC257P	ST			[替换型号]ECG74HC257	20111231
M74HC257B1N	ST			[替换型号]ECG74HC257	20111231
M74HC257B1	ST			[替换型号]ECG74HC257	20111231
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