# OLB Viewer

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

> Каноническая страница: https://elysiatools.com/ru/viewers/olb

- **Категория:** Диаграммы

- **Поддерживаемые форматы:** .olb, .dra

## Обзор

This OLB viewer renders OrCAD library files directly in your browser. OLB (.olb) is Cadence OrCAD's symbol library format, storing electronic component symbols for schematic design. DRA (.dra) is the drawing format. Pick a sample library or choose your own .olb / .dra file to preview its contents instantly, with no upload.

## Когда использовать

- You received an .olb file from an OrCAD user and want to inspect it.
- You need a quick, private preview of component symbols.
- You want to check OrCAD library contents without the software.

## Как это работает

- Select a built-in sample library or choose your own .olb / .dra file.
- The viewer parses the OrCAD binary format in your browser — nothing is uploaded.
- Inspect the library parts, symbols and pin definitions.

## Сценарии использования

- Previewing OrCAD component libraries.
- Checking schematic symbols without OrCAD.
- Inspecting PCB design library exports.

## Примеры

- **Библиотека OrCAD OLB**: A OLB sample for in-browser preview

## Частые вопросы

### What is an OLB file?

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.

### What is a DRA file?

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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