IPC Standards For PCB Design and CAD

IPC-7351B Requirements for Surface Mount Design and Land Pattern Standard

IPC-7351B includes both the standard and an IPC-7351B land pattern calculator on CD-ROM for accessing component and land pattern dimensional data. The calculator includes the document’s mathematical algorithms so users can build a land pattern for a corresponding surface mount part quickly and accurately.The tool also allows for modification of dimensional attributes of IPC approved land patterns.

This popular document covers land pattern design for all types of passive and active components, including resistors, capacitors, MELFs, SSOPs, TSSOPs, QFPs, BGAs, QFNs and SONs. The standard provides printed board designers with an intelligent land pattern naming convention, zero component rotations for CAD systems and three separate land pattern geometries for each component that allow the user to select a land pattern based on desired component density.

Revision B now includes land pattern design guidance and rules for component families such as resistor array packages, aluminum electrolytic capacitors, column and land grid arrays, flat lead devices (SOFL and SOTFL) and dual flat no-lead (DFN) devices. The revision also discusses the usage of thermal tabs and provides a new padstack naming convention that addresses the shape and dimensions of lands on different layers of printed boards.Purchasers also receive a 10-day trial of the IPC-7351 Land Pattern Wizard developed by Mentor Graphics, which is an advanced version of the IPC-7351B Land Pattern Calculator. The IPC-7351B Land Pattern Wizard tool enables users to not only save their land patterns within new land pattern library files, but also to instantly export land patterns to their preferred CAD format, such as Allegro, Board Station, Expedition, PADS, CADSTAR, OrCAD, Pantheon and P-CAD. 102 pages. Order and Download IPC Standard 7351B.

IPC-2221B Generic Standard on Printed Board Design

IPC-2221B is the foundation design standard for all documents in the IPC-2220 series and is included i the IPC-2220 series. It establishes the generic requirements for the design of printed boards and other forms of component mounting or interconnecting structures, whether single-sided, double-sided or multilayer. Among the many updates to Revision B are new criteria for conductor characteristics, surface finishes, via protection, board electrical test, dielectric properties, board housings, thermal stress, compliant pins, panelization and internal and external foil thicknesses. Appendix A provides new test coupon designs used for lot acceptance and quality conformance testing. Order and Download IPC Standard 2221B.

IPC-2220 Set of IPC Standards for PCB Design and CAD

The series is built around the IPC-2221B, Generic Standard on Printed Board Design, the base document that covers all generic requirements for printed board design, regardless of materials. From there, the designer chooses the appropriate sectional standard for a specific technology. IPC-2221B and all five sectional standards are included with the series: IPC-2222A, Sectional Design Standard for Rigid Organic Printed Boards; IPC-2223C, Sectional Design Standard for Flexible Printed Boards; IPC-2224, Sectional Standard for Design of PWBs for PC Cards; IPC-2225, Sectional Design Standard for Organic Multichip Modules (MCM-L) and MCM-L Assemblies; and IPC-2226, Sectional Design Standard for High Density Interconnect (HDI) Printed Boards. This series provides coverage on material and final finish selection, current carrying capacity and minimum electrical clearances, test specimen design, guidelines for V-groove scoring, dimensioning requirements and conductor thickness requirements. Order and Download IPC 2220 Family of Design Documents.


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