2.5mm 4-Pole TRRS to Four 4.0mm Gold-Plated Female Snap Electrode Lead Wire
Four snap electrode connections, one compact 2.5mm device plug. This custom lead wire uses a 2.5mm four-pole (TRRS) male connector at the equipment end and branches into four 4.0mm female snap terminations for compatible TENS, EMS and physiotherapy systems. The gold-plated snap contacts are a distinguishing part of this connector configuration.
The cable is intended for equipment whose electrode wiring has already been defined—not as a universal audio adapter or a universal replacement for every 2.5mm device. Heymed Medical can develop the lead arrangement, connector contacts, cable dimensions and identification details around the approved controller and electrode interfaces.
Why the Four-Pole Plug Matters
A TRRS plug has four separate contact positions—tip, ring 1, ring 2 and sleeve. On an electrode lead wire, the function of those contacts comes from the host-device pinout. The plug shape is similar to a four-pole audio connector, but that does not make its electrode wiring interchangeable with consumer audio equipment.
When a new cable is made from a reference sample, the first check is the device-side contact mapping: which TRRS contact goes to which snap lead, whether any contacts are shared, and whether the equipment requires a particular lead sequence. Four physical leads should not automatically be described as four independently driven stimulation channels.
For equipment that instead uses a two-contact 2.5mm connector and only two snap outputs, the 2.5mm Mono to Dual 4.0mm Female Snap Electrode Cable is a different interface arrangement, not a plug-in equivalent to this TRRS design.
Gold-Plated Female Snaps at the Electrode End
Each of the four outgoing leads finishes in a 4.0mm female snap connector intended to engage with a matching male electrode stud. The reference product specifies gold-plated contacts, which may be selected where the project requires that contact finish. The snap housings, contact finish and lead identification can be specified together for a consistent assembly.
The actual snap fit still needs to be checked against the mating electrodes. The nominal 4.0mm designation is useful for selecting a connector family, but retention, stud profile and contact engagement should be confirmed with the intended electrode pad or physical sample.
Cable Routing for Four Electrode Positions
In a practical TENS or EMS equipment setup, four snap leads may need to reach separate electrode pads while the controller stays at a convenient distance. The main cable, breakout point and individual lead lengths should therefore be considered as one layout rather than chosen from a single overall length.
The lead grouping and any color or printed identifiers can follow the controller's wiring scheme. For a replacement lead, matching the existing pinout and electrode connections is more important than matching the outer appearance alone. Other connector and electrode formats are available in our TENS & EMS Cables & Electrode Accessories range.
Configuration to Confirm Before Sampling
Device interface: 2.5mm four-pole (TRRS) male plug.
Electrode end: Four 4.0mm female snap connectors with gold-plated contact specification.
Wiring: Tip/ring/ring/sleeve assignment and each lead's function follow the approved equipment diagram.
Cable layout: Main cable length, breakout location and four branch lengths to be confirmed.
Construction: Wire gauge, jacket material, molded transitions and strain relief selected for the project.
Identification: Lead colors or labels, snap housing color and packaging according to the customer specification.
Developing the Right Cable from a Controller or Electrode Sample
Heymed Medical can start from the original lead wire, a 2.5mm four-pole connector drawing, a pin-assignment table or samples of the matching snap electrodes. The engineering review focuses on connector fit, continuity from the TRRS contacts to each lead, the gold-plated snap specification and the finished cable routing.
Once a sample and drawing are approved, the same definition can guide connector assembly, overmolding, lead identification, electrical inspection and OEM/ODM production. Projects requiring a different device connector or custom lead count can be reviewed through our Custom Medical Cable Assemblies capability.
For an accurate quotation, please provide the intended equipment interface, four-lead pinout, matching electrode type, desired cable and branch lengths, material requirements and estimated order quantity.
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