3.5mm Jack (mini-jack)
TL;DR
The 3.5mm jack (also called mini-jack, 1/8-inch, aux) is the most common consumer audio connector - used for headphones, phones, and line-level audio. Modern phones increasingly drop the jack in favor of USB-C or Bluetooth.
The 3.5mm audio jack is the small round connector historically found on every phone, laptop, and audio device. Also called mini-jack, 1/8-inch, or aux jack.
Configurations
- TS (Tip-Sleeve) – mono, 2 conductors
- TRS – stereo, 3 conductors (standard headphones)
- TRRS – stereo + mic, 4 conductors (headset with microphone)
Modern relevance
iPhones dropped the 3.5mm jack in 2016 (iPhone 7). Many Android phones followed. Modern replacement: USB-C DAC dongles or Bluetooth.
In hi-fi
Many DACs have a 3.5mm aux output for connecting subwoofers or portable amps. The Fosi DS3 and most portable amps still use it.
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