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LOW-PIN-COUNT POWER CABLE GUIDE

1 Pin vs 2 Pin Magnetic Power Cable Selection Guide

CTP supplies custom 1-2 pin power cables for OEM and ODM device programs. Pin layout, geometry, materials, electrical requirements, sealing and validation are.

Compare 1 Pin and 2 Pin Browse Current 2 Pin Catalog
DIRECT SELECTION RULE

Should the Power Cable Use 1 Pin or 2 Pin?

Begin with the complete supply and return path. The connector should be selected only after both sides of the power circuit have been clearly identified.

Choose a 1 Pin structure only when another intentional and validated conductive return path already exists elsewhere in the device. Choose 2 Pin when both supply and return should pass through the magnetic cable assembly.
1P

1 Pin: Special Shared-Return Architecture

A single-contact cable should be treated as a system-level engineering project rather than a standard one-wire replacement.

The external return path is clearly identified
The return component is intentionally conductive
Polarity and mating state are controlled
The complete device circuit is available for review
Route: submit the complete circuit and device structure for a special 1 Pin engineering review.
2P

2 Pin: Dedicated Supply and Return

A two-contact cable is the clearer starting point when both conductive paths must travel through the magnetic connector and cable.

One contact is assigned to each required path
Polarity is documented at both ends
Cable length and conductor requirements are defined
The device-side input requirement is known
Route: continue to the current 2 Pin Magnetic Cable Connector catalog after specifications are confirmed.
COMPLETE POWER PATH

Review the Entire Power Loop, Not Only the Magnetic Head

The magnetic cable is one part of a complete electrical path. Selection should include the source, cable, connector, device input and return path.

01

Power Source

Define the actual output voltage, operating conditions and source-side interface.

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02

Cable & Conductors

Define cable length, conductor paths, routing and mechanical movement.

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03

Magnetic Interface

Define contact assignment, polarity, orientation and mating position.

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04

Device Input

Define the required input voltage, device circuit and acceptance conditions.

The return path must complete the loop

In a 2 Pin cable, the two contacts can provide two dedicated conductive paths through the magnetic interface. In a 1 Pin design, the second side of the circuit must be intentionally provided elsewhere and included in the engineering review.

POLARITY & MIS-MATING REVIEW

How Will the Cable Prevent an Incorrect Power Connection?

A low-pin-count power cable needs a clearly documented electrical assignment and mating strategy.

CONTACT ASSIGNMENT

Define the Function of Each Contact

Document the source-side and device-side assignment instead of relying only on wire colors or product appearance.

MATING ORIENTATION

Confirm Every Possible Mating Position

Review whether the connector can mate in one orientation, multiple orientations or a rotational position.

MECHANICAL LOCATION

Define the Locating Structure

Confirm how the housing, shape, magnet arrangement or device geometry guides the mating sides.

DEVICE RESPONSE

Define Behavior During Wrong or Partial Contact

Review the expected device state during partial mating, offset contact, disconnection and unintended orientation.

SOURCE LABELING

Keep Documentation Consistent

Use the same contact IDs, viewing direction and polarity definition across drawings, wiring and inspection documents.

VALIDATION

Test More Than the Intended Mating State

Sample review should include the intended connection and any reasonably possible offset or reversed mating state.

Connector geometry alone should not be treated as proof of electrical protection. The complete source, cable, connector and device circuit should be reviewed together.
POWER CABLE DESIGN RELATIONSHIPS

Cable Length Cannot Be Selected Independently

Cable length, current, voltage, conductor structure and device requirements should be reviewed as one system.

Design Input Why It Matters Related Decisions Information to Provide
Source Voltage Defines the electrical condition supplied to the complete cable and device interface. Device input, polarity, source interface and acceptance limits. Nominal voltage and allowable operating range.
Operating Current Influences conductor, contact allocation and thermal evaluation. Conductor requirement, cable length, contact structure and test conditions. Normal current, peak current and duty condition.
Cable Length Affects resistance, routing, user handling and the complete voltage delivered to the device. Conductor, jacket, strain relief and installation path. Required length and acceptable tolerance.
Conductor Structure Must support the required electrical and mechanical operating conditions. Flexibility, cable diameter, repeated movement and termination. Fixed, occasionally bent or repeatedly moved.
Device Input Requirement Determines whether the delivered electrical condition is compatible with the device. Source selection, cable design and device-side power management. Device specification or circuit information.
Environmental Condition Temperature, moisture, abrasion and chemicals influence cable and overmolding evaluation. Jacket material, strain relief, connector housing and validation. Operating environment and test requirements.
This table describes design relationships rather than fixed performance limits. Final specifications should be validated against the complete project conditions.
SPECIAL 1 PIN REVIEW

A 1 Pin Power Cable Requires a Complete-System Review

A single visible pogo contact is not a complete explanation of the electrical architecture. The external return path must be identified and reviewed.

DO NOT START FROM APPEARANCE

“One Wire” Does Not Automatically Mean “One Contact”

The project should not move into mechanical development until the complete conductive loop, polarity, connected-state behavior and external return component have been documented.

Return path identified

Name the exact component or structure that completes the circuit outside the pogo contact.

Conductive function intentional

Confirm that the return component was designed for electrical use rather than assumed to be conductive.

Mating sequence understood

Define the electrical state during approach, partial contact, full connection and separation.

Device protection reviewed

Provide the device circuit information needed to assess unintended or incomplete contact states.

2 Pin alternative evaluated

Confirm whether routing both conductive paths through a dedicated 2 Pin cable would simplify integration.

TWO-PIN SPECIFICATION WORKSHEET

Define the Complete 2 Pin Power Cable

A 2 Pin requirement is not complete until the electrical assignment, cable and mechanical conditions are documented.

Contact P1 Function
State the source-side and device-side connection.
Contact P2 Function
State the source-side and device-side connection.
Source Voltage
Nominal and allowable operating range.
Operating Current
Normal, peak and duty condition.
Cable Length
Required total length and tolerance.
Source-Side Interface
Plug, bare wire or customer-defined termination.
Cable Outlet Direction
Straight, side, angled or drawing-defined.
Mating Orientation
Fixed, reversible, rotational or mechanically keyed.
Installation Space
Available length, width, height and routing area.
Movement Condition
Fixed, occasional bending or repeated movement.
Operating Environment
Temperature, moisture, abrasion and exposure.
Expected Quantity
Prototype and production quantity estimate.
When these inputs are available, the project can move from a broad “2 Pin power cable” request to a defined cable assembly and product-category review.
POWER SYSTEM RESPONSIBILITY

What the Magnetic Power Cable Does—and Does Not Define

Separate the cable assembly from the functions provided by the power source and the customer device.

POWER SOURCE

Source-Side Responsibility

The source defines the electrical output supplied to the cable. Its output conditions should be provided as part of the project input.

CABLE ASSEMBLY

Cable-Side Responsibility

The cable provides the defined conductive and mechanical path between the source-side interface and the magnetic connection.

CUSTOMER DEVICE

Device-Side Responsibility

The device circuit determines how the incoming electrical condition is received, managed and used by the equipment.

“2 Pin power cable” does not automatically define voltage regulation, battery charging control, communication protocol or device-side protection. Those functions depend on the complete source and device system.
SAMPLE VALIDATION PLAN

What Should Be Checked on a 1–2 Pin Power Cable Sample?

Sample approval should confirm the electrical path, polarity and mechanical integration—not only whether the cable can power on the device once.

01
Contact Assignment

Verify that every source-side and device-side contact matches the approved drawing.

02
Polarity

Confirm the intended connection and every reasonably possible alternative mating position.

03
Delivered Electrical Condition

Review the electrical condition at the device under the agreed source, cable and load conditions.

04
Temperature Condition

Review the cable and connector under the agreed operating and test conditions.

05
Partial or Offset Mating

Observe the system behavior during approach, incomplete alignment and separation.

06
Cable Routing

Confirm outlet direction, bending space, strain relief and device interference.

07
Mating Retention

Confirm that the selected mating behavior is appropriate for the actual device use condition.

08
Documentation Match

Ensure contact IDs, wire assignment, dimensions and viewing direction match the sample.

09
Device-Level Operation

Complete the final review inside the actual customer device or representative assembly.

CURRENT PRODUCT CATALOG

Continue to the Current 2 Pin Magnetic Cable Catalog

Use this guide while the power path, polarity and cable requirements are still being defined. Enter the current product catalog after the supply and return paths are confirmed.

Browse 2 Pin Magnetic Cable Connectors All Magnetic Cable Connectors Return to Magnetic Cable Selection Guide Need a 2 Pin Connector Only? Need a Round Cable Structure? Request a 1 Pin Project Review
1–2 PIN POWER CABLE FAQ

Low-Pin-Count Magnetic Power Cable Questions

What is the difference between a 1 Pin and 2 Pin magnetic power cable?
A 2 Pin cable can provide two dedicated conductive paths through the magnetic interface. A 1 Pin structure requires another intentional conductive return path elsewhere in the complete device system.
When should I choose a 2 Pin magnetic power cable?
Choose 2 Pin as the starting category when both the supply and return paths should pass through the magnetic connector and cable assembly.
Can a 1 Pin magnetic cable complete a power circuit?
A one-contact interface can only be evaluated when the second side of the circuit is intentionally provided through another defined conductive structure.
Does a 2 Pin cable automatically support fast charging?
No. Two contacts describe the physical conductive-path count. Charging behavior depends on the source, device circuit, cable design and complete electrical requirements.
Does a shorter cable always carry more current?
Cable length is only one design input. Current capability and delivered electrical performance depend on the conductor, contacts, temperature, source and complete operating conditions.
How should polarity be defined for a 2 Pin cable?
Define the function of each contact from a stated viewing direction and use the same assignment on the source-side, device-side, PCB, wiring and inspection documents.
What information is required for a 2 Pin power cable?
Provide contact assignment, source voltage, normal and peak current, cable length, source-side interface, installation space, mating orientation, cable outlet, environment, expected quantity and available drawings.
POWER PATH & CABLE REVIEW

Need Help Choosing 1 Pin or 2 Pin?

Send the complete supply and return path, source voltage, current, cable length, polarity and available drawings. The project can then be routed to the current 2 Pin cable category or a special 1 Pin engineering review.