The IPC-7351A PCB Matrix LP Calculator is the library maintenance tool that will revolutionize the way you work. This software gives you access to options that will allow you to quickly and easily browse your PCB land pattern library to locate, view, construct and verify the mechanics of your PCB library design. What About Alternatives? 
Like nearly everything else, there are alternatives. However, this software stands above the other "maverick" calculators and land pattern generators out there.
The first and most important reason is that we alone did not determine how the outputs are generated. Instead, we worked with IPC as the IPC-7351A standard was developed to ensure the output of this software would comply with the new standard and be accepted by the industry. Unlike alternatives, this software was produced from the ground up based entirely on the IPC-7351A as this standard was developed, which means this software does not build parts to our standard, but the IPC-7351.
Another reason our software is superior is because it perfectly dovetails with the absolutely free library documentation provided by IPC. This documentation is rapidly growing and will continually add greater value to LP software users over time. Unlike other tools created independently of IPC, this tool will meet your company's long-term library documentation needs, and provide you unprecedented compatibility with what the rest of the industry is using.
The library documentation includes component dimensional data for over 2,700 standard surface mount parts available in the IPC-7351A three-tier format (over 6,000 parts)! Also included is information and weblinks to over 8,000 non-standard components and connectors.
LP Software The LP software product line consists of a number of products. The products are listed below:
• Viewer - easily search the library for the land patterns you need, and ability to view PDF and Web-linked datasheets plus on- screen graphic display for most standard SMD components
• Calculator - design PCB land patterns by simply entering the manufacturer’s component data; see the results of your design immediately in the Viewer window and evaluate Solder Joint Analysis
• Librarian - In addition to features of calculator, you can save, store, and reference component data to eliminate redundant work • Wizard - export features in addition to the Librarian features, you can export to Allegro, Altium Designer, Board Station, CADSTAR, CR5000, Eagle, Expedition, McCAD, OrCAD Layout, OrCAD Editor, Pantheon, PADS, PADS ASCII, P-CAD, Pulsonix, and Ultiboard in a snap! Other formats are being developed!
Future options are planned for:
• IPC-2581 Wizard - turn your calculations into a real IPC-2581 land pattern at the push of a button
The following are target conditions for Chip, Gull-Wing, and J-Lead components. For best CAD library accuracy and quality, use the LP Calculator to achieve the best land pattern results derived from your component dimentional data or our rapidly growing library documentation. If you want to maintain your own library documentation, get the LP Librarian (includes calculator), and if you want to build parts directly to your CAD tool in less time than it takes you to key in the component dimensions, just use the LP Wizard. Building the perfect CAD library parts can't get any easier than by using the IPC-7351A LP Wizard!
The IPC-7351A 3-Tier Library System Land patterns need an accurate Solder Joint Statistical Analysis. To help ensure that you have good solder joints regardless of what size tolerance (minimum, nominal or maximum) the components come in, use the LP Librarian. The solder joint analysis data is a must when it comes to DFA. Only the IPC-7351A LP Librarian provides you the solder joint analysis information that you need to ensure a perfect Land Pattern.
The IPC-7351A LP Calculator is in accordance with the new IPC-7351A specification. Different electronic products have different requirements for reliability, maintainability and board density. With the 3-tiered library construction concept built into the IPC-7351A LP Calculator, you can generate land patterns to meet different requirements by varying the pad and courtyard dimensions.
Three land pattern geometry variations are supplied for each of the device families; maximum land protrusion (Density Level A), median land protrusion (Density Level B) and minimum land protrusion (Density Level C). With the 3-tiered library construction concept built into the IPC-7351A LandWiz, you can generate land patterns to meet those different requirements by varying the pad and courtyard dimensions.
Here are the three different tiers and how and when you should use them:
Density Level A: Maximum (Most) Land Protrusion For low-density product applications, the 'maximum' land pattern condition has been developed to accommodate wave or flow solder of leadless chip devices and leaded gull- wing devices. The geometry furnished for these devices, as well as inward and “J”-formed lead contact device families, may provide a wider process window for reflow solder processes as well.
Density Level B: Median (Nominal) Land Protrusion Products with a moderate level of component density may consider adapting the 'median' land pattern geometry. The median land patterns furnished for all device families will provide a robust solder attachment condition for reflow solder processes and should provide a condition suitable for wave or reflow soldering of leadless chip and leaded gull-wing type devices.
Density Level C: Minimum (Least) Land Protrusion High component density typical of portable and hand-held product applications may consider the 'minimum' land pattern geometry variation. Selection of the minimum land pattern geometry may not be suitable for all product use categories. The use of classes of performance (1, 2, and 3) is combined with that of component density levels (A, B, and C) in explaining the condition of an electronic assembly. As an example, combining the description as Levels 1A or 3B or 2C, would indicate the different combinations of performance and component density to aid in understanding the environment and the manufacturing requirements of a particular assembly.