SMT, PCB Electronics Industry News
  • SMTnet
  • »
  • Industry News
  • »
  • IPC RELEASES NEW REVISION OF SURFACE MOUNT DESIGN AND LAND PATTERN STANDARD

IPC RELEASES NEW REVISION OF SURFACE MOUNT DESIGN AND LAND PATTERN STANDARD

Jul 22, 2010

BANNOCKBURN, IL — IPC — Association Connecting Electronics Industries® has released the B revision of IPC-7351, Generic Requirements for Surface Mount Design and Land Pattern Standard. The leading industry standard for surface mount land pattern design and layout, IPC-7351B provides designers and printed board fabricators with updated guidance on requirements of land pattern geometries used for the surface attachment of electronic components, as well as surface mount design recommendations for achieving the best possible solder joints.

"The new IPC-7351B standard introduces several new component families and lead forms that include micro-miniature flat-lead and no-lead components, and a new padstack standard naming convention," says Tom Hausherr, EDA library product manager, Mentor Graphics Corporation and member of the IPC 1-13 Land Pattern Subcommittee. "Overall, the IPC-7351B standard is a key publication in the electronics industry for accurate CAD library generation."

A major addition to IPC-7351B, the new padstack naming convention consists of combinations of letters and numbers that represent the shape or dimensions of lands on different layers of printed boards or documentation. The padstack naming convention enables a designer to convey all variations and dimensions of a padstack, employing it in combination with intelligent land pattern conventions also defined within the standard, according to design rules established in the IPC-2220 design series.

A popular document that covers land pattern design for all types of passive and active components, IPC-7351 directs users on an appropriate land pattern based on desired component density through the provision of three separate land pattern geometries for each component. The new B revision of the standard introduces land pattern design guidance and rules for new surface mount component families such as electrolytic aluminum capacitors (CAPAE); small outline diode, flat lead (SODFL) and small outline transistor, flat lead (SOTFL); and dual flat no-lead (DFN) devices.

Several device families, including DPAK, QFP (quad flat pack) and QFN (quad flat, no-lead), often feature thermal pads on the bottom of the packages that expose the die to the printed board surface, which maximizes the efficient heat transfer path when these devices are soldered to the printed board. The usage of such thermal pads, however, carries a risk of the component floating on top of the solder. Therefore, IPC-7351B now provides a default paste mask for those pads to allow the package body to settle.

The B revision of the standard also expands its lead free coverage with the addition of new solder alloys and presents thoughtful discussion on etch-factor compensations at the designer level as well as at printed board fabrication. In addition, IPC-7351 has been edited significantly by users of the standard to enhance its clarity and understanding.

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.

Purchasers also receive a 30-day free trial of the IPC-7351 Land Pattern Wizard™ developed by Mentor Graphics®. An advanced version of the IPC-7351B Calculator, the IPC-7351 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.

A half-day workshop on the updates to IPC-7351 will be held on September 29, 2010, at Electronics Midwest in Rosemont, Ill.

For more information or to purchase IPC-7351B, visit http://www.ipc.org/7351 or contact John Perry, IPC technical project manager, at JohnPerry@ipc.org or +1 847-597-2818.

IPC (www.IPC.org) is a global trade association based in Bannockburn, Ill., dedicated to the competitive excellence and financial success of its 2,700 member companies which represent all facets of the electronics industry, including design, printed board manufacturing, electronics assembly and test. A member-driven organization and leading source for industry standards, training, market research and public policy advocacy, IPC supports programs to meet the needs of an estimated $1.7 trillion global electronics industry. IPC maintains additional offices in Taos, N.M.; Arlington, Va.; Garden Grove, Calif.; Stockholm, Sweden; Moscow, Russia; and Shanghai and Shenzhen, China.

Jun 24, 2022 -

North American EMS Industry Up 9.4 Percent in May

Jun 24, 2022 -

IPC APEX EXPO 2023 Call for Participation Deadline Extended

Jun 24, 2022 -

IPC-1402, Standard for Green Cleaners Used in Electronics Manufacturing Now Open for Public Review

Jun 24, 2022 -

Industry Groups Urge U.S. Congress to Fix Weaknesses in Electronics Supply Chain

Jun 16, 2022 -

Registration Open for 4th Annual M-EXPO Wire Processing Technology Expo

Jun 16, 2022 -

Higher Costs Continue to Dominate Electronics Industry Narrative

Jun 02, 2022 -

IPC Issues Call for Participation for IPC E-Textiles 2023

Jun 02, 2022 -

North American EMS Industry up 4.3 Percent in April

Jun 02, 2022 -

North American PCB Industry Sales Up 2.1 Percent in April

Jun 02, 2022 -

AirBorn Inc. Requalifies for IPC/WHMA-A-620 Qualified Manufacturers Listing

1289 more news from Association Connecting Electronics Industries (IPC) »

Jul 06, 2022 -

Offline PCBA Cleaning Machine HJS-7100,rosin flux, non-clean flux,water-soluble flux cleaning machine

Jul 05, 2022 -

Semiconductor Spray Cleaning Machine HJS-9700,Semiconductor Wafer Cleaning Machine HJS-9700

Jul 04, 2022 -

Pneumatic Stencil Cleaner HJS-9000II,dual chamber stencil cleaning machine

Jul 03, 2022 -

Electric Stencil Cleaner HJS-9500, SMT Electric Stencil Cleaner HJS-9500

Jul 01, 2022 -

Screen Cleaning Machine HJS-4600, SMT Screen Cleaning Machine HJS-4600

Jun 30, 2022 -

Electric Fixture Cleaning Machine HJS-6700, SMT pallet cleaning machine, soldering pallet cleaning machine

Jun 29, 2022 -

Waste Water Treatment Machine RWT-1000, SMT Waste Water Treatment Machine RWT-1000

Jun 28, 2022 -

Gen3's Dr Chris Hunt, CTO submits an insightful paper to the journal of Surface Mount Technology

Jun 28, 2022 -

Squeegee Cleaning Machine HJS-3700,SMT Squeegee Cleaning Machine HJS-3700

Jun 27, 2022 -

Solderstar Celebrates 20 Years of Innovation

See electronics manufacturing industry news »

IPC RELEASES NEW REVISION OF SURFACE MOUNT DESIGN AND LAND PATTERN STANDARD news release has been viewed 532 times

  • SMTnet
  • »
  • Industry News
  • »
  • IPC RELEASES NEW REVISION OF SURFACE MOUNT DESIGN AND LAND PATTERN STANDARD
IPC Training & Certification - Blackfox

 Reflow System