USB-C Headphone Adapter Not Working? It Likely Needs a Built-In DAC

Quick answer: Most silent USB-C to 3.5mm adapters are analog adapters with no DAC (digital-to-analog converter). Samsung says its newest Galaxy phones no longer support DAC directly and need an adapter with a built-in DAC. The analog adapter mode was also removed from the USB-C spec in October 2023, so phones are less likely to support it.

Last updated: November 4, 2026

Why the adapter gives no sound

A headphone jack needs an analog signal. Your phone's USB-C port can send audio two ways:

Adapter type	How it works	What happens on newer phones
Analog (passive)	The phone itself converts sound and sends analog audio through the USB-C pins	Often no sound or a "not supported" message
Digital (built-in DAC)	The phone sends digital audio, and a small chip in the adapter converts it	Works on phones with an audio-enabled USB-C port

Samsung's UK support page puts it plainly: newer Galaxy phones "no longer directly support DAC," so you need a USB-C to 3.5mm adapter with built-in DAC. If you buy one from another brand, Samsung says to make sure it is DAC compatible.

The USB standards group (USB-IF) made the same shift. In Release 2.3 of the USB Type-C spec (October 2023), it deprecated the "Audio Adapter Accessory Mode," the mode passive analog adapters rely on, and replaced it with Liquid Corrosion Mitigation Mode. USB-C digital audio follows the USB Audio Device Class specs instead.

Error messages and what they mean

What you see	Likely cause
"Connected USB device isn't supported" (Galaxy)	Analog adapter or analog USB-C earphones
"Not compatible" message (Galaxy)	Same cause
No message, no sound	Analog adapter, or the adapter isn't fully seated
Sound works but the mic or buttons don't	The adapter or headset doesn't support those functions

Samsung's support page says analog USB audio accessories can trigger a "Not-compatibility" or "Connected USB device isn't supported" error, and you will not hear any sound. It recommends USB-C earphones that support Digital Output.

Fix it in this order

Unplug and plug it back in firmly. A case can stop the plug from seating fully. Try with the case off.
Check the port. Lint in the USB-C port can block contact. Look with a light, and clear it gently with a wooden or plastic toothpick, never metal.
Try the adapter on another device. If it works on a laptop but not your phone, your phone likely needs a DAC adapter.
Check the box or listing for "DAC." If it doesn't say DAC or digital, assume it is analog.
Replace it with a DAC adapter from your phone maker or a brand that lists DAC support.

Which adapter to buy

Adapter	US price	DAC	Charge at the same time
Apple USB-C to 3.5 mm Headphone Jack Adapter	$9.00	Not listed on Apple's page	No (one plug)
Samsung USB-C to 3.5mm Headset Jack Adapter (EE-UC10J)	Varies by seller	Samsung says to use a built-in DAC adapter	No
Belkin RockStar 3.5mm Audio + USB-C Charge Adapter	$39.99	Built-in	Yes, up to 60W passthrough

For iPhone 15 and later: Apple's support page says to use the Apple USB-C to 3.5 mm Headphone Jack Adapter (or the Apple USB-C to Lightning Adapter for Lightning headphones) to play audio through the USB-C port.

Apple also notes that devices and cables that don't follow the USB-C standard "might not work as expected." Apple's own adapter is the safe pick on iPhone.

For Galaxy phones: buy Samsung's own adapter or another brand that clearly says built-in DAC.

If you need to charge while listening: a two-port adapter with a DAC, like Belkin's RockStar, lets you take calls and listen while passing through up to 60W. Belkin says full speed needs a USB Power Delivery or Quick Charge 2.0 charger and a compatible device, and actual charging speed depends on your phone and charger.

Using Lightning headphones on a USB-C iPhone

Old Lightning EarPods won't plug in directly. Apple's USB-C to Lightning Adapter supports power, data and audio, so your Lightning headphones work through it.

One more thing: USB-C accessories and Wi-Fi

Apple notes that some third-party USB-C accessories and cables can interfere with wireless connections. If Wi-Fi or cellular feels slower while the adapter is plugged in, it should return to normal once you unplug it.

Sources

Prices are as of November 4, 2026 in US dollars.