1 SCOPEThis standard prescribes pra

1 SCOPEThis standard prescribes practices and requirements for the manufacture of soldered electrical and electronic assemblies. Historically,electronic assembly (soldering) standards contained a more comprehensive tutorial addressing principles and techniques. For a morecomplete understanding of this document’s recommendations and requirements, one may use this document in conjunction with IPCHDBK-001 and IPC-A-610.When IPC/EIA J-STD-001 is cited or required by contract, the requirements of IPC-A-610 do not apply unless separately orspecifically required. When IPC-A-610 is cited along with IPC/EIA J-STD-001, the order of precedence is to be defined in theprocurement documents.1.1 Purpose This standard describes materials, methods and acceptance criteria for producing soldered electrical and electronicassemblies. The intent of this document is to rely on process control methodology to ensure consistent quality levels during themanufacture of products. It is not the intent of this standard to exclude any procedure for component placement or for applying fluxand solder used to make the electrical connection. The methods used shall (D1 D2 D3) produce completed solder joints conforming tothe acceptability requirements described in this standard.The requirements for assembly, soldering, soldered connections, cleaning, coating/encapsulation, rework, and verification are definedin general terms.1.2 Classification This standard recognizes that electrical and electronic assemblies are subject to classifications by intended end-itemuse. Three general end-product classes have been established to reflect differences in producibility, complexity, functionalperformance requirements, and verification (inspection/test) frequency. It should be recognized that there may be overlaps ofequipment between classes.The user (see 3.2.11) is responsible for defining the product class. The product class should be stated in the procurementdocumentation package.CLASS 1 General Electronic Products Includes products suitable for applications where the major requirement is function of thecompleted assembly.CLASS 2 Dedicated Service Electronic Products Includes products where continued performance and extended life is required, andfor which uninterrupted service is desired but not critical. Typically the end-use environment would not cause failures.CLASS 3 High Performance Electronic Products Includes products where continued high performance or performance-on-demandis critical, equipment downtime cannot be tolerated, end-use environment may be uncommonly harsh, and the equipment mustfunction when required, such as life support or other critical systems.1.3 Measurement Units and Applications All dimensions and tolerances, as well as other forms of measurement (temperature,weight, etc.) in this standard are expressed in SI (System International) units (with Imperial English equivalent dimensions provided inbrackets). Dimensions and tolerances use millimeters as the main form of dimensional expression; micrometers are used when theprecision required makes millimeters too cumbersome. Celsius is used to express temperature. Weight is expressed in grams.1.3.1 Verification of Dimensions Actual measurement of specific part mounting and solder fillet dimensions and determination ofpercentages are not required except for referee purposes. For the purposes of determining conformance to this specification, allspecified limits in this standard are absolute limits as defined in ASTM E29.1.4 Definition of Requirements The word shall is used throughout this document whenever a requirement is intended to express aprovision that is binding.Where the word shall leads to a hardware defect for at least one class, the requirements for each class are annotated in text boxeslocated adjacent to that occurrence in the text. These boxes are summarized in Appendix A. Appendix A identifies each listedcondition for each class as either ‘‘Defect,’’ ‘‘Process Indicator,’’ ‘‘Acceptable,’’ or ‘‘No Requirement Specified.’’ In case of adiscrepancy between requirements in the text boxes and Appendix A, requirements listed in the text boxes take precedence.Line drawings and illustrations are depicted herein to assist in the interpretation of the written requirements of this standard. Whentables or figures provide details of the requirements, the tables or figures take precedence over the text of this standard.IPC-HDBK-001, a companion document to this specification, contains valuable explanatory and tutorial information compiled by IPCTechnical Committees that is relative to this specification. Although the Handbook is not a part of this specification, when there isconfusion over the specification verbiage, the reader is referred to the Handbook for assistance.