Electronics Terminology: SDF
In microelectronics, SDF stands for Standard Delay Format.

An SDF file is specific to a particular electronic circuit design and contains estimated timing delay information for all the logic gates, ("gate delay"), and associated interconnect, ("net delay"), in that design. SDF files are generated by analysis of the design netlist. There are two broad types of SDF:

This information, in conjunction with the design netlist itself, can be used to evaluate the timing performance of a design prior to manufacture. Such analysis can be conducted by "dynamic", (i.e. simulation), or "static", ("STA"), means.