IEC 62435-3:2020 pdf download

IEC 62435-3:2020 pdf download.Electronic components – Long-term storage of electronic semiconductor devices
1 Scope
This part of IEC 62435 describes the aspects of data storage that are necessary for successful use of electronic components being stored after long periods while maintaining traceability or chain of custody. It defines what sort of data needs to be stored alongside the components or dies and the best way to do so in order to avoid losing data during the storage period. As defined in this document, long-term storage refers to a duration that can be more than twelve months for products scheduled for long duration storage. Philosophy, good working practice, and general means to facilitate the successful long-term-storage of electronic components are also addressed. NOTE In IEC 62435 (all parts), the term “components” is used interchangeably with dice, wafers, passives and packaged devices.
4 Data storage
4.1 General Data associated with the electronic components that are stored shall itself be stored securely without degradation in order to be available when required during the entire storage period or longer, if specified. Data not currently required may be archived for future use and reassessment.The data archive is generally stored on any medium, which may include non-volatile memory, optical disk or storage in redundant array disk servers. It is important to ensure the environment for media storage is low risk for degradation, and accidental or random events that could destroy or corrupt the data. The value of the parts is highly dependent upon the data without which the company might cease to function. See Table A.1 for critical data storage considerations. The physical and cyber security of the archive store are not mentioned further here, but should be a main consideration when planning its location and access. 4.2 Data storage options From the early 1960s onwards, media for storing data other than paper, have historically evolved towards magnetic, optical and other forms of solid-state media. It is common practice to ensure redundancy of storage within storage servers, across physical sites and geographies. Redundant array storage enables periodic back-up copies and checks to ensure longevity. Some printed data is effectively undecipherable without computer assistance (such as bar codes or matrix marks). It is conceivable to store enough information in the optical markings to satisfy business requirements for traceability. Similarly, printed data may be recovered from paper or from the part using optical character recognition and associated software. Other legacy storage media, such as microfiche, can also be in use. 4.3 Paper data storage concerns Paper storage with the components being stored is subject to many hazards that can be mitigated with regular intervention. Data and information stored on paper can be corrupted by aging of ink, moisture or water exposure or simple loss of the physical paper record and/or it’s facsimile. It is recommended that the stored paper be acid free to minimize the risk of brittle degradation. The permanence of the printed mark on the archival paper should also be considered for long-term storage of paper with components.4.4 Electronic data storage concerns Careful selection of the electronic medium is required, as there are many hazards in relying on this media that are not instantly apparent. It shall be remembered that data to be archived shall be retrievable, otherwise the purpose of archiving is negated. Data redundancy can be achieved by redundant array of independent disks (RAID) at a local or remote network host. Similarly redundant optical storage may also be used for network storage. Third party “data storage”/”data warehouse” companies exist, and these are often used as a suitable secondary location backup and repository for critical or sensitive data. Data security should be considered in any storage scheme to avoid loss of data upon retrieval, storage itself or during decoding. Data security measures should be in place upon data recording on the systems used to generate and store the data. Data to be stored should be checked prior to storage. Finally, upon retrieval, data extraction equipment should employ data security measures in additional to ensuring that older data formats are not miscategorised as unsafe for security.