The requested file:
https://pdf.datasheetcatalog.com/datasheet/supertex/IRF511.pdf
is the data sheet for the following electronic components:

Supertex Inc

#	Part Name	Description
1	IRF510	N-Channel Enhancement-Mode Vertical DMOS Power FETs
2	IRF511	N-Channel Enhancement-Mode Vertical DMOS Power FETs
3	IRF512	N-Channel Enhancement-Mode Vertical DMOS Power FETs
4	IRF513	N-Channel Enhancement-Mode Vertical DMOS Power FETs

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