Datasheet for the LT1009, a 1.37 MB PDF from Linear Technology, now part of Analog Devices. The LT1009 is a 2.5 V precision shunt voltage reference behaving like a trimmable zener, used in measurement equipment, power supplies and other circuits needing a stable reference. The document describes pin connections, accuracy, temperature coefficient, trim adjustment and typical application circuits. Technicians use it to confirm the expected 2.5 V reading across the device and to check bias resistor values when a reference rail drifts.
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 @ic_mosfet_pdf_datasheets. 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.