3.5mm 4-Conductor (Female Jack) to 2.5mm 4-Conductor TRRS (Male Plug) Adapter

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3.5mm 4-Conductor (Female Jack) to 2.5mm 4-Conductor (Male Plug) Adapter • Part No. CRD-SML

Features of the CRD-SML Adapter:

  • Allows you to adapt a larger size 3.5mm 4-Conductor male plug to devices that accepts a smaller size 2.5mm 4-conductor plug.
  • The wiring is pin-for-pin the same, but just reduces the plug size.
  • Adapter will convert 4-conductor 3.5mm plug sizes to fit into 2.5mm size jacks
  • Enables users with a standard 4-conductor headset earphone to listen to music or other audio content from a device that has a 2.5mm audio jack
  • NOTE: As indicated in the FAQ's below, this adapter will NOT convert your earphone or headphone to work with desktop telephone or cordless telephones - If you are looking to connect an AHS Apple or CTIA compatible headset to a landline telephone, please view our Model AH2P HERE.

3.5mm 4-Conductor (Female Jack) to 2.5mm 4-Conductor (Male Plug) Adapter • Part No. CRD-SML

Part Number CRD-SML audio adapter

Our CRD-SML (cord-small) adapter accepts a 4-conductor 3.5mm male plug and will pass the signals through to a 4-conductor 2.5 mm plug

Here are some of the features of our CRD-SML 4-cond 3.5mm to 4-cond 2.5mm adapter:

  • 3.5mm female jack accepts a standard 4-conductor smart phone type of headset plug
  • Designed to connect with audio equipment that accept a 2.5mm 4-conductor male plug
  • Converter adapter is made for audio devices that have a 2.5mm size jack
    (NOTE: we recommend our AH2P or SH2P adapters for landline telephones as indicated in the FAQ's below)
  • TRRS 3.5mm female jack to TRRS 2.5mm male plug adapter 
  • Enables connection of many 3.5mm plug headset earphones to devices which have a 2.5mm headset jack
  • May be useful for older Motorola and Samsung phones that have a 2.5mm 4-conductor headset jack
  • Total length from plug tip to jack end is 5-inches or 12.5 cm
  • Black color
  • Connect 3.5mm plugs to 2.5mm jacks (no conversion)
  • Lightweight quick and easy installation
  • Brand new, packaged in zip plastic bags

If you have a 4-conductor headset plug and need to mate that with a 2.5mm 4-conductor audio jack, the CRD-SML adapter cable may be right for you. There is no conversion within the cable, and it is a straight 4-conductor 3.5mm to 4-conductor 2.5mm connection.

  • Simple connectivity - Allows you to use your favorite 3.5mm headset earphone with some 2.5mm jack mobile phones, PDA, IPAQ, MP3, MP4 players or audio player devices that have a 2.5mm jack
  • Many Motorola cell phones have a 2.5mm jack that is smaller in size than the standard 3.5mm plugs so it is often hard to find a headset earphone for those phones.
  • NOTE: The CRD-SML adapter is NOT compatible with most portable home telephones
    - We have a different adapters (model AH2P or SH2P) that can be used with cordless phones and landline phones in the home and office if they accept a 2.5mm headset jack.

Part Number CRD-SML Plug Connections

FAQ 1: Can I use the CRD-SML adapter to plug my Apple earphones into a cordless telephone or desktop office phone system 2.5mm headset jack?

Answer: No; If your earphone is the type that has an inline microphone and is an Apple or CTIA compatible 4-conductor plug earphone (or wired headset) you could use our AH2P adapter with your landline phone. The diagram below shows that the AH2P adapter fits between your earphone plug and the jack on the telephone.

Adapter Connects Wired Apple Earphones to Landline Phone

FAQ 2: Can I use the CRD-SML adapter with my old Samsung or Android OTMP wired earphone to plug into my Desktop Telephone or Portable Cordless Telephone?

Answer: No; Unfortunately the CRD-SML adapter is not compatible with the 2.5mm headset jack on most telephones.  Many older cell phone earphones had a 4-conductor plug that would fit into Android phones, including the Samsung cell phones and tablets, however they used a wiring configuration known as OTMP. The OTMP compatible wired earphones can use our SH2P Adapter to connect to desktop or portable cordless telephones. As you can see from the diagram below, the original Samsung compatible earphones had microphone and ground connections that were reversed from the Apple configuration.

Samsung OTP Earphone Adapter for Cordless and Desk Phones

FAQ 3: What adapter would I need if I wanted to connect my old iPhone earphones or iPhone compatible wired earphones to my cordless phone or desktop telephone?

Answer: You would need our Model AH2P Apple Compatible Earphone Adapter for Landline Telephones. To use the AH2P adapter, your Apple compatible wired earphones must be the type that have an inline microphone. The AH2P adapter can enable you to communicate easily without having to hold your handset or portable phone. Great for working from home.

NOTE: We recommend our AH2P or SH2P adapters for home and office style telephones, like desk phones or cordless telephones similar to those shown below:

Desktop Telephones Thumbnail Image    Portable Cordless Telephone with 2.5mm Plug

Jack Type
3.5mm 4-Cond
Plug Type
2.5mm 4-Cond
Plug Plating
Plug Style
90-Degree Slim

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