PDF datasheet for the 2N5306 transistor, 56.9 KB, with no manufacturer or revision stated in the name. It is the first number of the 2N5306 to 2N5308 group also catalogued here. Typical contents are pin identification, collector and emitter ratings, current gain data and thermal limits. Use it when tracing a fault to this device, setting up a correct meter test, or confirming that a replacement offers equal or better ratings. Check the physical package and its lead order before soldering anything in.
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.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.