Overview#
JIG-101 was the first widely-shared list of what to declare in electronics, and the direct ancestor of today's IEC 62474 list. The Joint Industry Guide was produced jointly by electronics-industry associations, including JEITA (the Japan Electronics and Information Technology Industries Association), which is why "JIG" is sometimes linked back to those bodies in older documents.
Why it still matters#
JIG-101 proved the model the whole industry now relies on: one agreed list of substances, with thresholds and the reason each one is listed. When IEC 62474 launched with a continuously-maintained database, JIG-101 was retired in its favour.
You'll still meet "JIG" in older supplier documents and templates. Treat it as historical. The live reference is the IEC 62474 Declarable Substance List.