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CONTACT ALLOCATION SELECTION GUIDE

4 Pin vs 5 Pin Magnetic Connector Selection Guide

Use this 4 Pin vs 5 Pin magnetic connector selection guide to determine whether four independent electrical contacts are sufficient or whether a fifth defined contact is required. The guide explains contact allocation, possible fifth-contact functions, protocol and current misconceptions, mechanical design impact, and how to continue to the current 4 Pin or 5 Pin magnetic connector catalog.

Compare 4 Pin and 5 Pin Browse Current Categories
DIRECT SELECTION RULE

Should You Choose a 4 Pin or 5 Pin Magnetic Connector?

The decision should be based on the number of independent electrical paths required by the complete circuit—not on which connector appears more advanced.

Choose 4 Pin when four defined contacts cover every required electrical function. Choose 5 Pin only when the fifth contact has a clear and necessary circuit role.
4P

Choose 4 Pin When Four Contacts Are Complete

A four-contact connector is appropriate when every required power, return, control, detection or signal path can be clearly assigned within four contacts.

All four contact functions are defined
No necessary fifth independent path exists
The PCB and housing support the selected layout
Selection result: do not add a fifth contact only for appearance or an undefined future possibility.
5P

Choose 5 Pin When a Fifth Function Is Defined

A five-contact connector is appropriate when the project requires one additional independent conductive path beyond the four already assigned contacts.

The fifth contact has a documented function
The circuit and PCB include the extra channel
The housing can accommodate the required layout
Selection result: the fifth contact should solve a real circuit requirement, not simply increase pin count.
CONTACT ALLOCATION WORKSHEET

Assign a Function to Every Contact Before Selecting Pin Count

Write down the function of each conductive path. When the fifth position has no necessary function, the project may not require a 5 Pin connector.

4 Pin Allocation

FOUR DEFINED PATHS
P1
Contact Function 1 Define its exact circuit role.
P2
Contact Function 2 Define its exact circuit role.
P3
Contact Function 3 Define its exact circuit role.
P4
Contact Function 4 Define its exact circuit role.
When all required functions fit into these four documented paths, continue to the 4 Pin catalog.

5 Pin Allocation

FIVE DEFINED PATHS
P1
Contact Function 1 Define its exact circuit role.
P2
Contact Function 2 Define its exact circuit role.
P3
Contact Function 3 Define its exact circuit role.
P4
Contact Function 4 Define its exact circuit role.
P5
Required Fifth Function Document why this extra path is necessary.
Continue to the 5 Pin catalog only when P5 has a defined electrical purpose in the complete system.
The contact labels above are intentionally blank. Power, return, control, detection, signal and identification assignments vary by project and should not be assumed from pin count alone.
FIFTH-CONTACT REQUIREMENT

What Can Justify the Fifth Contact?

The following are possible engineering reasons for an additional contact. They are examples—not standardized 5 Pin assignments.

DETECTION

Connected-State Detection

A fifth path may participate in a customer-defined circuit that detects whether the connector is in the intended mating state.

IDENTIFICATION

Accessory Identification

An additional contact may support identification of a charger, module, accessory or customer-defined device.

CONTROL

Enable or Control Path

A separate control or enable circuit may require an independent fifth conductive path.

SIGNAL

Additional Signal Channel

The fifth contact may carry another defined signal when four contacts cannot support all required paths.

REFERENCE

Separated Reference or Return

The complete circuit may require a separately defined return, reference or ground-related path.

RESERVED

Documented Future Function

A reserved contact may be considered when its future function is already documented in the product roadmap, PCB and mechanical design.

An undefined “backup pin” is not automatically a reason to select 5 Pin. The additional contact still affects the PCB, housing, inspection and mating structure.
KEEP THE CONTACT COUNT PURPOSEFUL

When Is 4 Pin the More Appropriate Choice?

Five contacts are not automatically better than four. A connector should contain the number of paths required by the system—without unnecessary contact positions.

Four functions are already complete

Every required conductive path can be assigned and validated within four contacts.

The fifth function is still undefined

The project has no documented need for detection, control, identification or another signal path.

Installation space is restricted

Adding another contact may require changes to pitch, housing width, PCB pads or the overall layout.

The existing PCB uses four defined paths

A fifth contact should not be added without an associated PCB connection and circuit purpose.

Compatibility is based on a four-contact interface

The project may need to remain compatible with an established four-contact mating or accessory system.

The extra position creates no measurable function

A contact that has no circuit role still occupies structural and production resources.

PIN-COUNT MISCONCEPTIONS

What 4 Pin and 5 Pin Do Not Automatically Mean

Pin count describes the number of physical electrical contacts. It does not, by itself, define a protocol, data rate, current rating or finished cable function.

Myth: 4 Pin automatically means USB data

Four contacts may be assigned in many different ways. USB or another interface function must be confirmed through the complete wiring and protocol requirements.

Myth: 5 Pin automatically provides faster data

Adding one physical contact does not define signal type, communication protocol, data rate or signal integrity.

Myth: 5 Pin always carries more current

Current capability depends on the assigned power contacts, contact structure, material, temperature and complete electrical design—not simply the total pin count.

Myth: The fifth contact can be added without consequences

Even an unused position can affect the connector layout, PCB pads, housing dimensions, mating structure and inspection.

Myth: The same pin count guarantees compatibility

Two connectors with the same contact count may use different pitch, polarity, assignment, dimensions and magnetic arrangements.

Myth: 5 Pin is always a newer or higher-grade solution

The appropriate solution is the one that matches the required circuit and structure. More contacts are not automatically evidence of a better design.

STRUCTURAL IMPACT

What Changes When Moving from 4 Pin to 5 Pin?

Adding a fifth contact is not only an electrical change. The complete connector and device structure may require review.

Design Area Possible Change Question to Confirm Required Input
Contact Layout The connector may require a revised single-row, double-row, circular or custom arrangement. Can five contacts fit while maintaining the required pitch and mating structure? Pin layout and available connector area.
Housing Dimensions Overall width, length or internal support structure may need adjustment. Does the device housing allow the revised size? Available length, width and height.
PCB Layout An additional pad, trace or routing path may be required. Is the fifth contact connected to a real circuit? PCB drawing and contact assignment.
Mating Orientation Contact symmetry, polarity control or locating features may require reevaluation. Can the connector mate only in the intended state? Mating direction and mechanical locating method.
Magnetic Structure Contact placement may interact with magnet position and the available internal space. Can contact and magnet locations coexist within the required geometry? Connector shape and magnetic arrangement.
Testing & Inspection The additional path must be included in electrical verification and contact-assignment checks. What condition confirms that P5 is functioning correctly? Circuit definition and acceptance criteria.
FIVE-STEP DECISION PATH

Confirm 4 Pin or 5 Pin Before Reviewing Products

Follow the steps in order. Do not begin with a product image and then try to force the circuit into its existing pin count.

01

List Every Required Path

Document power, return, control, detection, identification and signal requirements.

02

Assign P1–P4

Determine whether four contacts already cover the complete electrical system.

03

Define P5

When a fifth path is required, document its exact circuit function and connected-state behavior.

04

Check Structure

Confirm pitch, PCB area, housing dimensions, connector shape and mating orientation.

05

Choose the Catalog

Continue to 4 Pin when four paths are complete; continue to 5 Pin when P5 is necessary.

CURRENT PRODUCT CATEGORIES

Continue to the 4 Pin or 5 Pin Product Catalog

Use this comparison page while contact allocation is still being defined. Continue to the current product categories after the required number of independent paths is confirmed.

Browse 4 Pin Magnetic Connectors Browse 5 Pin Magnetic Connectors All Magnetic Connectors Return to Connector Selection Guide Need a 4 Pin Cable Assembly? Need a 5 Pin Cable Assembly? Request Pin Allocation Review
4 PIN VS 5 PIN FAQ

4 Pin and 5 Pin Magnetic Connector Questions

What is the main difference between a 4 Pin and a 5 Pin magnetic connector?
The physical difference is one additional electrical contact. The engineering difference depends on whether that fifth contact has a necessary function in the complete circuit.
When is a 4 Pin magnetic connector sufficient?
Four contacts are sufficient when every required conductive path can be clearly assigned within P1 through P4 and no additional independent detection, identification, control, signal or reference path is required.
What can the fifth contact be used for?
The fifth contact may be assigned to a customer-defined detection, identification, control, signal, reference, return or reserved function. There is no universal standardized fifth-contact assignment.
Does 4 Pin automatically support USB data?
No. Pin count alone does not define protocol support. The required signal, data, power and wiring arrangement must be confirmed for the complete interface.
Does a 5 Pin connector support more current?
Not automatically. Current capability depends on contact allocation, contact structure, materials, temperature and the complete electrical design.
Can the same housing be used for both 4 Pin and 5 Pin?
It depends on the existing pitch, internal space, PCB pads, housing dimensions, magnetic arrangement and mating structure. The complete drawing should be reviewed before assuming that one housing supports both layouts.
What information is required to choose between 4 Pin and 5 Pin?
Provide the function of every contact, voltage, operating and peak current, signal requirements, installation space, connector shape, mating orientation, expected quantity and any available PCB or device drawings.
CONTACT ALLOCATION REVIEW

Need Help Choosing 4 Pin or 5 Pin?

Send the required electrical functions, contact assignment, installation space and available drawings. The project can then be routed to the current 4 Pin or 5 Pin magnetic connector category.