This article shows how to calculate PTH (Plated Through-Hole) Hole and Pad Diameter sizes according to IPC, IPC and IPC standards in the . Check out page 39 of IPC (google: “IPC filetype:pdf” to find a free copy:)) Electrical clearance requirements are based on multiple. defined by the IPC generic standard: Level A: General Design Complexity. Level B: Moderate Design Complexity. Level C: High Design Complexity.
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Documents Flashcards Grammar checker. Existence of such Standards and Publications shall not in any respect preclude any member or nonmember of IPC from manufacturing or selling products not conforming to such Standards and Filetyep, nor shall the existence 2221q such Standards and Publications preclude their voluntary use by those other than IPC members, whether the standard is to be used either domestically or internationally.
Recommended Standards and Publications are adopted by IPC without regard to whether their adoption may involve patents on articles, materials, or processes. By such action, IPC does not assume any liability to any patent owner, nor do they assume any obligation whatever to parties adopting the Recommended Standard or Publication. Users are also wholly responsible for protecting themselves against all claims of liabilities for patent infringement.
When an IPC publication is updated and a new revision is published, it is the opinion of the TAEC that the use of the new revision as part of an existing relationship is not automatic unless required by the contract. The TAEC recommends the use of the latest revision. Your purchase of this document contributes to the ongoing development of new and updated industry standards and publications.
Standards allow manufacturers, customers, and suppliers to understand one another better. Standards allow manufacturers greater efficiencies when they can set up their processes to meet industry standards, allowing them to offer their customers lower costs.
There are many rounds of drafts sent out for review and the committees spend hundreds of hours in review and development. Therefore, the standards and publications revenue is necessary to complement dues revenue.
If your company buys IPC standards and publications, why not take advantage of this and filegype many other benefits of IPC membership as well? For more information on membership in IPC, please visit www. Thank you for your continued support. All rights reserved under both international and Pan-American copyright conventions.
Any copying, scanning or other reproduction of these materials without the prior written consent filety;e the copyright filettype is strictly prohibited and constitutes infringement under the Copyright Law of the United States. IPC – February Users of this publication are encouraged to participate in the development of future revisions. All aspects and details of the design requirements are addressed to the extent that they can be applied to the broad spectrum of those designs that use organic materials or organic materials in combination with inorganic materials metal, glass, ceramic, etc.
It is crucial that a decision pertaining to the choice of product types be made as early as possible. Once a component mounting and interconnecting technology has been selected the user should obtain the sectional document that provides the specific focus on the chosen technology. It may be more effective to consider alternative printed board construction types for the product being designed.
As an example the application of a rigid-flex printed wiring board may be more cost or performance effective than using multiple printed wiring boards, connectors and cables. In this regard document sets are used to provide the total information related to a particular electronic packaging topic.
A document set is identified by a four digit number that ends in zero 0. Included in the set is the generic information which is contained in the first document of the set and identified by the four digit set number.
The generic standard is supplemented by one or many sectional documents each of which provide 221a focus on one aspect of the topic or the technology selected. The user needs, as a minimum, the generic design document, the sectional of the chosen technology, and the engineering description of the final product.
As technology changes specific focus standards will be updated, or new filetyppe standards added to the document set. May IPCA Acknowledgment Any 22211a involving a complex technology draws material filetgpe a vast number of sources.
To each of them, the members of the IPC extend their gratitude. Naik Eagle Circuits Inc. Bowles, Sovereign Circuits Inc. Werner Engelmaier, Engelmaier Associates, L. Gandhi, Northrop Grumman Hue T. Kemp Rockwell Collins Frank Icp. Landolt, Cookson Electronics Michael G.
Malewicz, Siemens Medical Systems Inc.
IPC-2221A – University of Colorado at Boulder
Mansilla, Robisan Laboratory Inc. Martinez, Northrop Grumman Brian C. Reed, Upc Corporation Kelly M. Selk, Northrop Grumman Russell S. Wolf, Conductor Analysis Technology, Inc. Material Selection for Electrical Properties Material Selection for Environmental Properties Preimpregnated Bonding Layer Prepreg Adhesive Films ffiletype Sheets Solder Resist Solder Mask Coatings Board Geometries Size and Shape Component and Feature Location Mounting Over Conductive Fileyype B3—External Conductors, Uncoated, Over m [10, feet] Thermal Relief in Conductor Planes Lands for Flattened Round Leads Spacing of Adjacent Holes Conductor Width and Thickness Conductor Width and Spacing for Striplines, mm [in] The organic materials fi,etype be homogeneous, reinforced, or used in combination with inorganic materials; the interconnections may be single, double, or multilayered.
The requirements contained herein are intended to establish design principles and recommendations that shall be used in conjunction with the detailed requirements of a specific interconnecting structure sectional standard see 1.
This standard is not intended for use as a performance specification for finished boards nor as an acceptance document for electronic assemblies. The materials may be any combination able to perform the physical, thermal, environmental, and electronic function.
This standard identifies the generic physical design principles, and is supplemented by various sectional documents that provide details and sharper focus on specific aspects of printed board technology.
IPCA – University of Colorado at Boulder
The number IPC is for ordering purposes only and will include all documents which are a part of the set, whether released or in-process proposal format at the time the order is placed. All dimensions and tolerances in this standard are expressed in hard SI metric units and paren- 1. Users of this and the corresponding performance and qualification specifications are expected to use metric dimensions. Classification of producibility is related to complexity of the design and the precision required to produce the particular printed board or printed board assembly.
Any producibility level or producibility design characteristic may 222a applied to any end-product equipment category.
Saturn PCB Design Toolkit Version 7.06
Board types vary per technology and are thus classified in the design sectionals. It should be recognized that there may be an overlap of equipment between classes. The printed board user has filetypee responsibility to determine the class to which his product belongs. The contract shall specify the performance class required and indicate any exceptions to specific parameters, where appropriate. Class 1 General Electronic Products Includes consumer products, some computer and computer peripherals, as well as general military hardware suitable for applications where cosmetic imperfections are not important and the 1 IPCA major requirement is function of the completed printed board or printed board assembly.
Class 2 Dedicated Service Electronic Products Includes communications equipment, sophisticated business machines, instruments and military equipment where high performance and extended life is required, and for which uninterrupted service is desired but is fietype critical.
Certain cosmetic imperfections are allowed. Class 3 Filegype Reliability Electronic Products Includes the equipment for commercial and military ipd where continued performance or performance on demand is critical.
Equipment downtime cannot be tolerated, and must function when ic such as for life support items, or critical weapons systems.
Printed boards and printed board assemblies in this class are suitable for applications where high levels of assurance are required and service is essential. The use of one level for a specific feature does not mean that other features must be of the same level.
Selection should always be based on the minimum need, while recognizing that the precision, performance, conductive pattern density, equipment, assembly and testing requirements determine the design producibility level. The numbers listed within the numerous tables are to be used as a guide in determining what the level of producibility will be for any feature. The specific requirement for any feature that must be controlled on the end item shall be specified on the master drawing fioetype the printed board or the printed fipetype assembly drawing.
Changes to a figure or table are indicated by gray-shading of the Figure or Table header.
The tradeoff checklist see Table identifies the probable effect of changing each of the physical features or materials. The items in the checklist need to be considered if it is necessary to 2221s a physical feature or material from one of the established rules.
Cost can also be affected by these parameters as well as those in Table How to read Table As an example, the first row of the table indicates that if the dielectric thickness to ground is increased, the lateral crosstalk also increases and the resultant performance of the PCB is degraded because lateral crosstalk is not a desired property.
The master drawing or assembly drawing supplemented by an approved deviation list, if applicable. The approval of the layout by representatives of the affected disciplines will ensure that these production-related factors have been considered in the design. The success or failure of an interconnecting structure design depends on many interrelated considerations. From an end-product usage standpoint, the impact on the design by the following typical parameters should be considered.
Maintenance and serviceability requirements are important factors which need to be addressed during the design phase. Frequently, these factors affect layout and conductor routing. However, they all share a common attribute; they must route signals through conductors. There are also limits to how much routing each can accommodate. The factors that define the limits of their wire routing ability as a substrate are: In addition, the methods of producing blind and buried vias can facilitate routing by selectively occupying routing channels.
Vias that are routed completely through the printed board preclude any use of that space for routing on all conductor layers. These factors can be combined to create an equation that defines the wire routing ability of a technology.