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型号	厂家	封装	描述	日期

LF257				20040306
LF257	National			20040204
LF257H	National Semiconductor Corp		OP-AMP\|SINGLE\|BIPOLAR/JFET\|CAN\|8PIN\|METAL	20021223
LF257	ST		Wide Bandwidth Single J-Fet Operational Amplifiers(257.45 k)	20021222
LF257N	ST Microelectronics	DIP-8	Voltage-Feedback Operational Amplifier	20020807
LF257N	National Semiconductor Corp	DIP-8	Voltage-Feedback Operational Amplifier	20020807
LF257M	National Semiconductor Corp	SOP-8	Voltage-Feedback Operational Amplifier	20020807
LF257H	ST Microelectronics	CAN-8	Voltage-Feedback Operational Amplifier	20020807
LF257H	National Semiconductor Corp	CAN-8	Voltage-Feedback Operational Amplifier	20020807
LF257D	ST Microelectronics	SOP-8	Voltage-Feedback Operational Amplifier	20020807
LF257	RAYTHEON			20020807
LF257	NS		[替换型号]Pin-to-Pin Replacement:ADI OP17	20120117
OP17	ADI		[替换型号]Pin-to-Pin Replacement:National Semiconductor LF257	20120116
LF257	ST		[替换型号]LF257	20111231
LF257	NS		[替换型号]PM157	20111231
LF257	NS		[替换型号]LF257	20111231
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