Reference sheet for the 2SB1184, a part number in the Japanese JIS series where 2SB indicates a low-frequency PNP bipolar transistor. The 75.8 KB PDF is indexed as a schematic, but a component number like this normally points to a datasheet. Expect pin assignment, package outline, absolute maximum ratings and characteristic curves. Use it when testing a suspect transistor with a meter, identifying base, collector and emitter, or choosing an equivalent with matching voltage, current and power ratings.
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.