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

SGS Thomson Microelectronics

#	Part Name	Description
1	UC2842	CURRENT MODE PWM CONTROLLER
2	UC2843	CURRENT MODE PWM CONTROLLER
3	UC2844	CURRENT MODE PWM CONTROLLER
4	UC2845	CURRENT MODE PWM CONTROLLER
5	UC3842	CURRENT MODE PWM CONTROLLER
6	UC3843	CURRENT MODE PWM CONTROLLER
7	UC3844	CURRENT MODE PWM CONTROLLER
8	UC3845	CURRENT MODE PWM CONTROLLER

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