STANDARDS

Audio standards

JEITA, CTIA, IEC, OMTP and other reference standards that govern audio connectors.

IEC (International Electrotechnical Commission) · 1992 (current revision 2009)

IEC 60603-11 — TRS/TRRS Connector Mechanical Standard

International Electrotechnical Commission standard 60603-11 establishes the mechanical and dimensional requirements for the 3.5 mm and 2.…
OMTP (Open Mobile Terminal Platform) · 2005

OMTP Legacy Headset Standard

Open Mobile Terminal Platform standard, predating CTIA's AHT by 5 years. Specifies 3.5 mm TRRS pin assignment with Microphone on ring 2 a…
CTIA (Cellular Telecommunications Industry Association) · 2010

CTIA AHT — Headset Pin-Assignment Standard

CTIA's accessory-headset-test (AHT) specification, published in 2010, establishes the 3.5 mm TRRS pin-assignment standard for smartphone-…
JEITA (Japan Electronics and Information Technology Industries Association) · 2016

JEITA RC-8141C — 4.4 mm Pentaconn Standard

Japan Electronics and Information Technology Industries Association standard RC-8141C, published in 2016, defines the mechanical and elec…