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![]() Wikipedia has a short overview for which device uses which standard. CTIA is by default required for Android device manufacturers. CTIA jacks have improved compatibility to support not only AHJ but also OMTP. CTIA, named after The Wireless Association, which replaced AHJ and has the same pinout.AHJ (American Headset Jack) with a pinout of Left Audio, Right Audio, Ground, Mic.The original OMTP configuration, which was created by Nokia and has a pinout of Left Audio, Right Audio, Mic, Ground.There have been different TRRS standards: Connectors for headphones with a mic have an additional ring which results in a 4-conductor TRRS configuration (Tip, Ring, Ring, Sleeve). ![]() The pinout for these connectiors is: Left Audio, Right Audio, Ground. Standard 3.5mm jack stereo headphones have a 3-conductor configuration of TRS (Tip, Ring, Sleeve). On the bottom you can see a 3-pin headphone connector. A headset connector needs to be using the same TRRS standard, or it will not function properly if at all. On the top you can see a 4-pin headset connector. Here is the visual comparison of Apple TRRS plug and a standard TRS plug.
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