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

SGS Thomson Microelectronics

#	Part Name	Description
1	UC2842B	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
2	UC2843B	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
3	UC2844B	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
4	UC2845B	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
5	UC3842B	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
6	UC3843B	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
7	UC3844B	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
8	UC3845B	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

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