Dual 3.5mm Mono Male to 3.5mm Stereo Female Audio Adapter – Aviation Headset Y-Splitter Converter

Y-splitter adapter combining two 3.5mm mono TS male plugs into a single 3.5mm TRS stereo female jack — the standard adapter for connecting aviation-style headsets (which use separate mono plugs for microphone and headphone) to devices with a single 3.5mm TRRS or TRS stereo jack. Also used for combining two mono audio sources into a single stereo output, or for splitting a stereo signal into two mono channels.

Key Specifications

• Input: 2× 3.5mm mono TS male plugs (Tip = signal, Sleeve = ground)
• Output: 1× 3.5mm TRS stereo female jack (Tip = Left, Ring = Right, Sleeve = Ground)
• Wiring: Plug 1 (headphone) → Tip (Left) + Ring (Right); Plug 2 (microphone) → varies by application
• Body Material: Zinc alloy or ABS plastic
• Contact Material: Brass, gold-plated

Aviation Headset Connection — How This Adapter Works

General aviation headsets use two separate 3.5mm mono plugs: one for the headphone audio output and one for the microphone input. Modern intercom systems, smartphones, and computers use a single 3.5mm TRRS jack for both audio and microphone. This adapter combines the two mono plugs into a single stereo jack, allowing aviation headsets to connect to:

• Smartphone headphone jacks (for aviation apps, ForeFlight, Garmin Pilot)
• Laptop and tablet audio jacks (for flight simulation, online ATC)
• Portable intercoms and communication devices with 3.5mm stereo jacks
• Action cameras and recorders with 3.5mm stereo microphone inputs

Mono vs Stereo — Signal Routing

• Headphone plug (mono) → Stereo jack: The mono headphone signal is typically routed to both Left (Tip) and Right (Ring) channels of the stereo jack, providing audio in both ears. Some adapters route the mono signal to Left only — verify the adapter wiring if audio in both ears is required.
• Microphone plug (mono) → Stereo jack: The microphone signal is routed to the Ring channel (or Sleeve on TRRS jacks). The specific routing depends on the device’s TRRS standard (CTIA or OMTP).

Frequently Asked Questions

Will this adapter work with my smartphone for aviation apps?

Yes, for audio output (hearing the app’s audio through the headset). For microphone input (voice commands, push-to-talk), the adapter must route the microphone plug to the correct pin on the smartphone’s TRRS jack. Most modern smartphones use the CTIA standard (Sleeve = microphone). Verify the adapter’s wiring matches the CTIA standard before purchasing for microphone use.

Can I use this adapter in reverse — to split a stereo signal into two mono outputs?

Yes, electrically. Insert the stereo female jack onto a stereo source; the two mono male plugs will carry the Left and Right channels respectively. This is useful for sending Left and Right channels to separate mono inputs on a mixer or recording device.

What is the difference between CTIA and OMTP TRRS standards?

Both use a 4-pole 3.5mm TRRS plug but with different pin assignments: CTIA (Apple/Android standard): Tip = Left audio, Ring 1 = Right audio, Ring 2 = Ground, Sleeve = Microphone. OMTP (older standard, some older Nokia and Sony phones): Tip = Left, Ring 1 = Right, Ring 2 = Microphone, Sleeve = Ground. Using a CTIA adapter on an OMTP device (or vice versa) will result in no microphone signal or reversed ground/mic connections. Most modern devices use CTIA.

Typical Applications

• Aviation: Connecting general aviation headsets to smartphones and tablets for aviation apps
• Flight simulation: Connecting aviation headsets to PC/Mac for flight simulator audio and ATC
• Recording: Connecting aviation headsets to action cameras and portable recorders
• Audio splitting: Splitting a stereo source into two mono channels for mixing
• DIY audio: Custom audio routing adapters for mixed mono/stereo equipment

Package Contents

1× dual 3.5mm mono male to 3.5mm stereo female audio adapter.