Precision Manufacturing

3-Pin Magnetic Charging Cables for OEM Devices

When a device needs power, ground and one additional signal or detection contact, Magtor develops the full three-contact cable assembly around its requirements. Contact assignments, head geometry, cable length and USB-A, USB-C, terminal or bare-wire ends can be specified for the project.

Three-contact USB-C magnetic cable bundle and separate three-pad device receptacle.

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Factory-direct manufacturing combines industry experience with advanced production lines.

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Adapt contact assignments, connector shape and cable terminations to the device.

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Develop power and signal paths for demanding environments, with performance verified for the configuration.

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Engineering support covers rapid prototypes, tooling and production preparation.

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Magnetic Cable Connector
3 Pin Magnetic Charging Cable

3 Pin Magnetic Cable Options

Complete three-contact USB-A magnetic cable with wide rear-entry head and separate three-pad receptacle.

3 Pin Magnetic Charging Cable USB-A

The complete USB-A assembly suits consumer electronics, smart devices, charging docks and portable equipment needing a charging interface. Charging speed depends on the circuit and approved electrical design, rather than the USB-A end alone.

Three-contact bare-wire magnetic cable with two silver end magnets and a separate three-pad device plate.

3 Pin Magnetic Connector Cable Open

An open-ended cable can be developed for customer-specific terminal integration and mating connectors.

Three-contact black capsule mating connectors with circular end magnets on the pin half.

3 Pin Magnetic Connector

The matched device-side male and female parts use magnetic guidance and keyed geometry for rapid attachment. Rear sealing and custom protection ratings can be developed for the selected smart-device interface.

View 3 Pin Connectors

Example 3 Pin Magnetic Cable Configuration

These specifications describe one example with a terminal/open end. Other models and project requirements can use different values.

Magnetic cable dimension views and original three-row wire list.

Reference Specifications

Structure	3 Pin Magnetic Head + Open
Voltage / Current	DC12V / 3A Max
Cable Length	1000 mm
Wire	28AWG × 1C
Jacket	Black TPE
Working Stroke	1.00 mm
Mechanical Life	10,000 cycles

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What Is a 3 Pin Magnetic Charging Cable?

Built-in magnets align and retain the cable head. Three spring-loaded pogo contacts form its electrical interface.

The three contacts provide independent electrical paths between the source and device. A working system includes both the cable assembly and its matching device-side connector.

Three contacts do not define a universal pinout. Match the assignments to the approved OEM device schematic.

Three-contact magnetic head above a matching PCB interface with discrete spring contacts.

What Does the Third Pin Do?

The device schematic and approved contact map determine the role of the third contact. V+ and GND are typical power assignments; the remaining contact can serve one of the functions below.

ID

Power + Ground + ID

ID: allow the charger or host to identify the connected hardware version.

Det

Power + Ground + Detect

Detection: identify docking or attachment so software can change charging mode or display connection status.

Ctrl

Power + Ground + Control

Control: provide an enable or charging-control path for the battery management circuit.

Sig

Custom Development

Custom function: engineers define the three contacts around the device requirements.

White device housings showing two original three-contact magnetic interfaces.

How Do I Know If a 3 Pin Magnetic Charger Is Compatible?

Contact count is only one compatibility check. Different OEM devices do not share a universal three-contact charger standard.

Before specifying a replacement or custom cable, you must confirm:

Pin pitch (spacing)
Connector geometry & housing
Magnetic polarity (N/S)
Electrical polarity (+/-)
Pin assignment & function
Working height / compression
Voltage / Current rating
Device-side connector match

Choose the Cable End for Your Device

Select the end around the connection method used by the host system or power source for power and signals.

USB-A

For conventional USB supplies, charging adapters and standard accessories.

USB-C

For a USB-C power input; the connector does not by itself establish USB PD support.

Open Cable

Develop the required terminal arrangement around the equipment connection.

Three-contact T-shaped magnetic cable head with two coplanar end magnets and red, black and white stripped wires.

Three-contact magnetic connector pair, two magnets, matching exploded components and complete USB charging cable.

Custom 3 Pin Magnetic Charging Cable for OEM Devices

Once an enclosure, PCB and charging recess are fixed, a standard cable can have the wrong pitch, reversed polarity or an incompatible termination.

Magtor reviews the enclosure and PCBA drawings together. Mechanical dimensions and electrical paths can then be adapted to fit the recess and match the battery layout.

Customizable Parameters:

Connector dimensions
Pin pitch & assignment
Cable length & wire gauge
Cable OD & color
Overmolding design
Magnetic & electrical polarity
Cable outlet direction
USB / terminal / bare wire

What Should You Confirm Before Ordering?

Prepare these details for engineering review before approving the sample design.

Parameter	Why It Matters	Information to Provide
Device Application	Select materials for the operating environment.	Device type, usage scenario.
Pin Assignment & 3rd Pin Function	Define the required paths, such as V+, GND and detection.	Wiring diagram or sequence.
Pin Pitch & Connector Dimensions	Match the connector to the mating geometry.	2D/3D enclosure drawing.
Voltage & Current	Select conductor size and the internal contact structure.	Max voltage (V) and current (A).
Polarity (Magnetic & Electrical)	Check polarity and the intended mating direction to address short-circuit risk.	N/S magnet position, +/- pinout.
Cable Specs (Length, AWG, OD)	Plan flexibility, voltage drop and cable routing.	Length (mm), AWG size, OD limit.
Termination Type	Define the connection to the power source or PCB.	USB-A/C, specific terminal, or bare wire.
Device-side Connector	Match the opposing device-side magnetic interface.	Part number or drawing of mating part.

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Applications for 3 Pin Magnetic Charging Cables

Smartwatches & Wearables

Design constraint: a small wearable housing needs charging plus detection or ID in a compact interface.

Black smartwatch on its charging cradle; application concept.

Smart Glasses

Design constraint: a thin wearable housing has little interface space. Design approach: a compact three-contact cable with a USB end.

Charging Docks

Design constraint: docking without visual alignment plus connection detection. Design approach: assign the third contact to detection or ID.

Custom 5-Pin Magnetic Interfaces and Cable Options illustration.

Handheld Electronics

Design constraint: portable terminals charge frequently and need service access. Design approach: use a replaceable external cable.

Handheld barcode scanner in a logistics setting.

IoT Devices

Design constraint: a small sensor enclosure has limited space. Design approach: integrate terminal or bare-wire ends internally.

Smart home lighting, speaker, camera and control display; application concept.

Medical Electronics

Design constraint: an interface that can be cleaned and connected repeatedly. Design approach: a custom three-contact connection for compact medical electronics, validated as part of the device.

Patient and clinical monitoring equipment; application concept.

3 Pin vs 2 Pin Magnetic Charging Cable

Feature	2 Pin	3 Pin
Typical basic function	Power + Ground	Power + Ground + additional function
ID / Detection	Limited without extra contact	Can use third contact
Interface size	Can be smaller	Adds one electrical path
Typical use	Charging-only	Charging + ID / Detect / Control

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Choose contact count around the electrical functions the device needs. These examples are typical design choices, rather than universal contact standards.

Explore alternatives: 2 Pin Magnetic Charging Cable | Magnetic Cable Connector

2 Pin Magnetic Charging Cable Magnetic Cable Connector

Two original magnetic charging cable and connector examples with three-contact and two-contact interfaces.

Laboratory operators checking connector samples.

Testing and Manufacturing Support for OEM Cable Projects

After sample approval, batch consistency still needs inspection. Check conductor sequence, polarity, connector position, cable length and spring-contact performance during volume production.

Cable continuity / wire testing
Open / short verification
Contact resistance
Spring force
Plating thickness
Dimensional inspection
Mating-cycle testing
ROHS material checking

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Frequently Asked Questions

What is the third pin used for on a magnetic charging cable?

The third contact adds one path to power and ground. According to the schematic, it can serve device ID, attachment detection, charging control or a single signal channel.

Are all 3 pin magnetic charging cables interchangeable?

No. Match the contact pitch, geometry, electrical and magnetic polarity, and pin assignments. A cable for one smartwatch design may not fit or operate with another OEM device.

Can a 3 pin magnetic charging cable support data?

A three-contact interface can carry a single signal, such as 1-Wire or basic sensor data, alongside power and ground. It does not directly provide the four paths required for a standard USB 2.0 connection: VBUS, D-, D+ and GND.

Can a 3 pin magnetic cable use USB-C?

A USB-C source end can connect to a suitable modern adapter. This routes the supply through a USB-C connector; it does not automatically provide USB PD fast-charging capability.

What is the difference between a terminal cable and bare-wire cable?

A terminal cable uses a pre-crimped mating connector, such as a JST or GH series, for a matching PCB header. Bare-wire ends are stripped and tinned for direct soldering or integration into a custom harness.

How do I measure the pin spacing on my existing charger?

Measure adjacent pogo pin centers with digital calipers. The center-to-center distance is the pitch; 2.54mm and 3.0mm are examples rather than fixed series dimensions.

Can Magtor match a three-contact cable from a drawing or sample?

A sample or detailed 2D/3D drawing allows engineers to review dimensions, magnetic strength and pogo pin stroke and develop a matching custom assembly.

What information is needed to customize a 3 pin magnetic charging cable?

Start with contact pitch, rated voltage and current, cable length, termination type and the device-side connector drawing. Those inputs establish the physical and electrical compatibility requirements.

Request a Custom Engineering Quote

Share your cable project with Magtor for engineering review. Our team evaluates the requirements for prototypes and production at scale.

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