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60 PCB007 MAGAZINE I SEPTEMBER 2019 first-phase convergence with IPC-1752A amend- ment 3 (April 2017) and IEC 62474 edition 2 (issued end of 2018); those standards now offer similar capabilities in terms of their use cases: • There are two main declaration types specified in IEC 62474 corresponding to IPC-1752 Class C (compliance) and Class D (composition) declarations • In addition, material classes may be declared; the material class concept is addressed by IPC 1752 by information for a Class B declaration • IEC 62474 also provides for the ability to use query lists (Figure 8) • IPC-1752A amendment 3 (amd3) has in- troduced a unique ID for all data used to establish their query lists and substances category lists. In Amendment 3, these data fields are optional to give time to solution providers to update their solutions; in the coming revision B, these fields would be- come mandatory • Although conformance to the IEC 62474 standard requires the reporting to the IEC 62474 declarable substance/substance group list (including reportable applica- tions and reporting thresholds), the sche- ma in IEC 62474 allows material declara- tion reporting to any DSL, as long as that list has a list identity • The IPC-1752 standard works with vari- ous regulatory substances lists (RoHS, JIG, REACH Candidate List and Restrictions List, IEC 62474) with their exemptions lists in various versions (RoHS, ELV) pro- vided in appendices in portable document format and also in XML formats, either IPC-1752 or IEC 62474; for substance fam- ilies with no CAS, non-exhaustive lists of substances with CAS from REACH details is also provided in portable document for- mat appendixes • With IEC 62474 Ed 2.0, IEC now main- tains exemption lists for RoHS Annex III and IV and for China RoHS. IEC has the capability to add exemption lists for any other IEC member country based on its established change request process. Additions or changes to the exemption lists should be able to be done within a 3–4-month period from notice of an intended change • The material class list referenced in IPC-1752 is currently maintained by IEC within the database maintenance process by the VT 62474 Now, it is quite easy to convert declarations from one standard to the other, and some com- panies collect either IPC-1752 declarations or IEC 62474 declarations then convert them. That could be considered as partial interoper- ability between those two standards. Figure 8: New structure of IEC 62474 Edition 2 standard.