The requested file:
https://pdf.datasheetcatalog.com/datasheet/nec/UPC4558C.pdf
is the data sheet for the following electronic components:

NEC

#	Part Name	Description
1	UPC4558	HIGH PERFORMANCE DUAL OPERATIONAL AMPLIFIER
2	UPC4558	Bipolar Analog Integrated Circuit
3	UPC4558C	Bipolar Analog Integrated Circuit
4	UPC4558C	HIGH PERFORMANCE DUAL OPERATIONAL AMPLIFIER
5	UPC4558G2	Bipolar Analog Integrated Circuit
6	UPC4558G2	HIGH PERFORMANCE DUAL OPERATIONAL AMPLIFIER

Select the part name and then you can download the datasheet in PDF format.