OLB (.olb) is Cadence OrCAD's library file format for storing electronic component symbols used in schematic capture. It contains part definitions, graphical symbols, pin assignments and package information in a proprietary binary format based on Microsoft's Compound File Binary (CFB) structure.

DRA (.dra) is Cadence OrCAD/Allegro's drawing file format, storing the physical layout artwork for PCB components including padstacks, package outlines and silkscreen markings.

Are my OLB files uploaded?

No. Files you open from your device stay on your device and are parsed locally. Only the public sample file is requested from the server.

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OLB Viewer

Free online OLB viewer. Open and preview OrCAD library files (.olb, .dra) directly in your browser — no upload, no software.

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OrCAD-Bibliothek OLB

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OLB (.olb) is the library file format for Cadence OrCAD, one of the most widely used electronic design automation (EDA) tools for schematic capture and PCB design. OLB files store collections of component symbols — resistors, capacitors, ICs, connectors — with their graphical representation, pin definitions, and package data. The format uses Microsoft's Compound File Binary (CFB / OLE2) container. DRA (.dra) files store Allegro PCB Editor drawing data for physical footprints.

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