All symbols are created with the Ultra Librarian software and are based on the ANSI Y32.2-1975 (Reaffirmed 1989) standard.
Our footprints are created through a template system and are consistent with the IPC-7351B standards where possible.
Your confidence in the accuracy of the Ultra Librarian CAD libraries is extremely important to us. As a result, all models are rigorously vetted before introduction into the library. To help ensure consistency across models we have chosen to utilize globally recognized industry standards from IPC and ASNI wherever possible. This not only helps ensure a common set of rules for library creation but also provides common naming conventions and guidelines that can be used by you and your downstream design and manufacturing partners.
On top of our standards-based process, our build methodology utilizes a single database structure. The data is stored in a vendor neutral format. This means that it stores all the relevant data from all the various CAD tools that we support, preventing any inconsistencies across CAD types.
Symbols and Footprints are built in English units (Mils) unless otherwise specified. Metric units are entered when appropriate (such as the pitch of metric pin spacing) but all dimensions are shown in Mils rounded to two decimal places. Actual locations are stored internally to 8 decimal place accuracy. Users can switch between metric and English units.
All components follow the IPC Padstack Naming Convention. Each footprint has the outline of the part to the max condition, and the pins and the Z height on the appropriate top assembly layer for the CAD tool.
Each pattern contains a silkscreen of the component on the top silkscreen layer. It avoids crossing pads where possible but depends on a silkscreen removal routine to completely remove silkscreen from pads.
Where applicable our parts are consistent with the IPC-7351B standard. We deviate from this standard in our naming conventions, and our use of English units of measure. However, all IPC driven parts have padstacks driven by the IPC formulas. Converting to mm will allow users to maintain the IPC naming. Through-hole footprints and footprints built to the manufacturer standards do not always meet IPC standards, but wherever possible we adhere to the IPC (such as the padstack naming, silkscreen widths, etc.). Converting to mm will allow users to maintain the IPC naming.
Footprints have dimensions on a separate layer to identify key features of the footprint. Both a silkscreen layer, which clearly identifies the part and any orientation, and an assembly layer containing data representing the exact size of the part. Each footprint contains a placement boundary if this information is available in the targeted CAD tool, and it contains test probe boundaries that change size based on the z axis or height of the footprint.
Did you know you Ultra Librarian Online Access allows you to search for component parts online? Not only can you get free symbols, footprints, and 3D models, but you can also search for component pricing, stock/inventory, and compliance specs all in one place. Access all the information you need to make smart component choices the first time around.