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Comparing Audio Quality: 3.5mm Headphone Jack vs. USB-C on Smartphones
Key points
- 3.5mm jacks convert audio to analog inside the phone.
- USB-C typically sends digital audio for external conversion.
- Audio quality depends on the DAC and amplifier, internal or external.
- Neither port inherently guarantees superior audio quality.
Evolution of Smartphone Audio Ports
The 3.5mm headphone jack was a standard feature on smartphones for years, providing a simple analog audio connection. Apple initiated the shift away from the 3.5mm jack with the iPhone 7 in 2016, moving to Lightning. Google followed with the Pixel 2 in 2017, adopting USB-C, and Samsung made the change in 2019. EU regulations eventually led Apple to transition to USB-C for the iPhone 15.
While most manufacturers have moved to USB-C for audio, charging, and data, some devices like the Sony Xperia 1 VIII (due June 2026) and certain mid-tier/budget smartphones still retain the 3.5mm jack.
Technical Differences in Audio Handling
The fundamental difference between 3.5mm and USB-C audio lies in the location of the digital-to-analog conversion (DAC). With a 3.5mm jack, the phone's internal DAC converts the digital audio signal to analog before it exits the device. The quality of this internal DAC and the phone's headphone amplifier directly influence the sound output.
Conversely, USB-C typically transmits a digital audio signal from the phone. The DAC is then located externally, either within the earbuds, headphones, or a USB-C to 3.5mm adapter. Most smartphones require an 'active' adapter with a built-in DAC for this conversion. Some phones also support an 'Audio Accessory Mode' for analog passthrough via USB.
Factors Influencing Audio Quality
Neither the 3.5mm jack nor USB-C inherently provides superior audio quality. For 3.5mm connections, high-quality audio depends on the phone's internal DAC and amplifier. For USB-C, excellent audio is achievable if the external DAC and amplifier in the connected accessory are of high quality.
The choice between the two largely depends on the existing equipment and preferences of the user.
✨ This summary was generated by AI from the outlets' reporting listed below. It is not independently verified and may contain errors — check the original sources. How BrevFeed works →
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Reporting from
This article analyzes the audio quality differences between 3.5mm headphone jacks and USB-C ports on smartphones. The primary distinction lies in where the digital-to-analog conversion (DAC) occurs, impacting overall sound quality based on internal phone components or external accessories.