Datasheet for the 2N5191 medium-power transistor, provided as a 217 KB PDF with an unexplained RE suffix. No manufacturer or revision is stated. Related part numbers 2N5194 and 2N5195 appear in the same index, which helps when looking for a complementary pair. The document should include maximum ratings, gain curves, switching data and the package outline showing lead and tab assignment. Use it to test the device, confirm pinout and choose a replacement; check the board footprint matches before soldering.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.