Part datasheet for the 1SV281, a 70.1 KB PDF filed as a schematic. Diodes numbered in the 1SV series are varactors, used where a reverse-biased junction acts as a voltage-controlled capacitor in tuners, PLLs and filters. Expect tables of capacitance against reverse voltage, maximum ratings and the mechanical drawing with marking. It helps identify an unmarked-looking SMD diode on an RF board and select a replacement with matching footprint, polarity and capacitance ratio.
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.