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Pin Map and Contact Functions
Define the function of each power, return, signal, control or detection contact.
CTP 4 Pin Waterproof Ring Magnetic Pogo Pin Connector is a paired magnetic interface featuring four inline contacts, a metal housing, a spring-loaded pogo pin side and a flat target side. The perimeter sealing structure can be integrated into project-specific charging, power, detection and signal interfaces. The final Pin Map, voltage, current, working stroke, magnetic retention, mating life and ingress protection must be confirmed for the selected connector and complete customer device.
Product specifications should be reviewed together with the customer device, PCB, electrical assignment and mechanical mating conditions.
Define the function of each power, return, signal, control or detection contact.
Provide voltage, continuous current, peak current and required signal conditions.
Provide available length, width, height, PCB area and required mating orientation.
Provide application, expected quantity, environment and customer validation requirements.
Review the product-specific description, technical parameters, contact arrangement, mechanical structure and project conditions below.
Engineering Summary: The CTP 4 Pin Waterproof Ring Magnetic Pogo Pin Connector is a paired magnetic contact interface with four inline electrical contacts, a metal housing, a spring-loaded pogo pin side and a flat target side. The visible perimeter sealing structure can support integration into a project-specific sealed interface, but the final electrical ratings, working stroke, magnetic performance, mating life and ingress protection must be confirmed for the complete connector and customer device assembly.
This 4 pin magnetic pogo pin connector is designed for custom devices that require a removable power, charging, detection or signal connection without using a conventional plug-and-receptacle structure.
The connector pair combines four electrical contact positions with magnet-assisted mating. One side contains spring-loaded contacts, while the opposing side provides flat mating targets.
The surrounding metal housing and perimeter sealing structure can be integrated into an enclosure, dock, cable head or removable accessory. Final suitability depends on the complete customer product rather than the connector appearance alone.
| Connector Element | Primary Function | Engineering Requirement |
|---|---|---|
| Four pogo pin contacts | Provide compliant electrical contact against the mating targets | Define the Pin Map, working stroke, force and electrical load |
| Four flat target contacts | Provide the opposing mating surfaces | Define target material, finish, flatness and support structure |
| Permanent magnets | Assist connector capture and retention | Define capture, seated retention and removal requirements |
| Metal housing | Supports the connector structure and mating geometry | Define mounting, insulation, grounding and enclosure integration |
| Perimeter sealing structure | May support a sealed connector-to-device interface | Define compression, sealing land and complete enclosure test conditions |
| PCB or other termination | Connects the interface to the customer circuit | Confirm PCB, FPC, wire or project-specific termination |
The four conductive contacts can be assigned in different ways according to the host device, accessory and circuit architecture.
| Example Pin Allocation | Possible Function | Required Confirmation |
|---|---|---|
| Pin 1 | Power input or output | Voltage, continuous current, peak current and power-enable state |
| Pin 2 | Power return | Return-path capacity, PCB routing and protection |
| Pin 3 | Detection, identification or project-specific signal | Logic voltage, circuit type and contact sequence |
| Pin 4 | Control, sensing or project-specific signal | Protocol, reference path and electrical protection |
The allocation above is an example only. A 4 pin magnetic connector does not automatically support USB, UART, I2C or another communication protocol.
The complete circuit, controller, return path, PCB routing and protection components must support the required function.
| Architecture | Example Allocation | Primary Engineering Focus |
|---|---|---|
| Charge-only interface | Two power contacts and two detection or identification contacts | Current, voltage drop, temperature rise and power sequencing |
| Power and low-speed signal | Power, return and two project-specific signal contacts | Logic levels, return path, interference and fault handling |
| Parallel power contacts | Two positive and two return contacts | Current sharing, contact-force variation and individual temperature rise |
| Detection and accessory identification | Power, return, detection and identification | Partial mating, wrong accessory and power-enable logic |
| Project-specific communication | Power pair plus defined communication contacts | Physical layer, PCB routing and complete channel validation |
| Parameter | Product Definition |
|---|---|
| Product Type | 4 pin waterproof ring magnetic pogo pin connector pair |
| Contact Count | 4 inline electrical contacts |
| Mating Structure | Spring-loaded pogo pin side with flat target side |
| Housing | Metal housing with project-specific mounting and insulation structure |
| Sealing Structure | Perimeter ring or gasket structure integrated according to the customer enclosure |
| Pin Map | Project-specific power, return, detection, identification or signal allocation |
| Overall Dimensions | Confirm using the approved product drawing |
| Contact Pitch | Confirm using the approved product drawing |
| Working Stroke | Confirm minimum, nominal and maximum compression |
| Contact Force | Report at a defined pogo pin working stroke |
| Voltage | Model- and circuit-specific |
| Continuous Current | Confirm per contact through voltage-drop and temperature-rise testing |
| Contact Resistance | Report with test current, working stroke, mating target and measurement method |
| Magnetic Performance | Capture, seated retention and separation force are measured separately |
| Mating Life | Confirm under defined stroke, load, speed, target and environmental conditions |
| Contact Finish | Confirm separately for pogo pin, target and termination |
| Ingress Protection | Applies only to a defined and tested connector or complete device assembly |
| Environmental Testing | Test standard, exposure, sample state and acceptance criteria must be defined |
| Termination | PCB, FPC, wire or project-specific integration |
The visible perimeter ring can form part of a sealed interface, but it should not be treated as independent proof of waterproof performance.
The complete sealing path may include:
Any ingress-protection statement should identify the exact tested assembly, the mated or unmated condition and the applicable test procedure.
The final sealing condition should be controlled by the product geometry and mechanical stops rather than by magnetic force alone.
Sealing compression may vary because of:
The gasket compression and pogo pin working stroke must remain within their approved ranges at the same final seated position.
Permanent magnets can help draw the two connector halves together. The final electrical alignment should still be established by the housings, locating features and mechanical stops.
| Interface Function | Recommended Control |
|---|---|
| Initial capture | Magnet arrangement and approach geometry |
| Polarity control | Asymmetric housing, keyed geometry and magnet arrangement |
| Final alignment | Housing guides, mating faces and mechanical datums |
| Pogo pin compression | Mechanical stops and the complete dimensional stack |
| Sealing compression | Defined sealing land and final assembled gap |
| Retention | Magnets, housing support or a separate latch where required |
| Removal | Defined pull direction and release-force requirement |
A simplified working-stroke calculation is:
S = Hfree - Hseated
where:
The tolerance calculation should include:
| Stroke Condition | Possible Result |
|---|---|
| Insufficient compression | Intermittent contact, unstable detection or increased resistance |
| Approved working stroke | Intended contact force and electrical condition |
| Excessive compression | Spring bottoming, target indentation, housing load or PCB stress |
| Unequal compression | Different contact resistance and uneven current distribution |
Magnetic attraction may hold the connector close to the mating position before all four contacts and the sealing ring are fully seated.
| Partial-Mating State | Possible Risk | Required Review |
|---|---|---|
| One side contacts first | Unexpected electrical contact sequence | Housing approach and contact-height tolerance |
| Laterally offset connection | A pogo pin reaches an adjacent target | Target spacing and maximum credible offset |
| Magnetically retained but not fully seated | False detection or unstable power | Independent seating verification |
| Incomplete sealing-ring compression | Environmental protection is not established | Mechanical stop and gasket compression |
| Conductive contamination | Short circuit or leakage between contacts | Power control and fault protection |
| Removal under load | Transient voltage, arcing or communication interruption | Power-disable sequence and powered-mating validation |
The current capability of the connector cannot be determined from the pin count or contact diameter alone.
A simplified electrical path is:
Rpath = Rhost-PCB + Rtermination1 + Rpogo + Rinterface + Rtarget + Raccessory-PCB
The voltage drop is:
Vdrop = I × Rpath
The resistive loss is:
Ploss = I² × Rpath
The project should define:
When two contacts are connected in parallel, they may not share current equally.
Current sharing can be affected by:
Individual contact current and temperature should be evaluated when contacts are paralleled.
The additional contacts may support project-specific control, detection, identification or communication functions.
The design should define:
Four contacts and low contact resistance do not automatically establish USB, high-speed data or video compatibility.
| Application | Possible Connector Role | Primary Design Focus |
|---|---|---|
| Outdoor electronic equipment | Charging, power or removable accessory connection | Sealing, contamination and cable pull |
| Smart-home equipment | Docking, charging, detection or accessory identification | Frequent mating, cleaning and exposed-contact safety |
| Charging base or dock | Power, return and project-specific control contacts | Alignment, working stroke and power sequencing |
| Portable device accessory | Removable power and signal interface | Retention, release and accessory identification |
| Industrial handheld device | Docking, charging or service connection | Dust, vibration, mechanical support and durability |
| Custom sealed electronics | Flush or shallow external electrical interface | Complete feedthrough and enclosure protection |
These applications are examples. Final suitability depends on the complete electrical, mechanical and environmental requirements.
| Requirement | Recommended Evaluation |
|---|---|
| Pin Map | Confirm the function and electrical state of all four contacts |
| Working Stroke | Verify minimum, nominal and maximum assembled compression |
| Contact Force | Measure the force-versus-stroke response |
| Contact Resistance | Measure with a defined current, target, stroke and sample condition |
| Voltage Drop | Measure the complete power path at intended current |
| Temperature Rise | Evaluate contacts, terminations, PCB and surrounding housing |
| Magnetic Capture | Evaluate approach and self-guiding behaviour |
| Retention and Release | Measure force in the intended use and removal directions |
| Partial Mating | Test offset, tilted and magnetically retained but unseated states |
| Short Circuit | Evaluate moisture, metal objects and adjacent-contact bridging |
| Sealing Compression | Verify minimum, nominal and maximum final gap |
| Ingress Protection | Test the defined connector or complete customer enclosure |
| Mechanical Endurance | Use defined stroke, speed, target and acceptance criteria |
| Powered Endurance | Evaluate mating and removal under the intended electrical state |
| Environmental Exposure | Test representative dust, humidity, moisture and cleaning conditions |
| Production Variation | Evaluate contacts, targets, housings, magnets and sealing-ring tolerances |
| Input | Information to Provide |
|---|---|
| Pin Map | Function of all four contacts |
| Electrical Conditions | Voltage, continuous current, peak current and signal type |
| Mechanical Space | Maximum length, width, height and restricted regions |
| Mating Direction | Approach, final seating and removal direction |
| Working Stroke | Minimum, nominal and maximum compression |
| Termination | PCB, FPC, wire or other connection |
| Magnetic Requirement | Capture, retention and release-force conditions |
| Sealing Requirement | Test assembly, mated state, IP target and environmental condition |
| Environment | Temperature, humidity, dust, vibration and cleaning exposure |
| Durability | Mating frequency, powered removal and acceptance criteria |
| Project Files | 2D drawing, 3D model, schematic, PCB layout or device assembly |
| Commercial | Prototype quantity, annual forecast and project stage |
The product image shows a paired structure consisting of a spring-loaded pogo pin side and a flat target side. The final supplied scope should be confirmed in the quotation and approved drawing.
They can be assigned to project-specific power and signal functions. The final Pin Map, return paths, protocol and electrical conditions must be defined by the customer circuit.
No. Pin count alone does not establish USB compatibility. The complete controller, PCB routing, protection and connector channel must support the required USB specification.
No universal rating should be assumed. Current and voltage depend on the selected contact structure, working stroke, termination, PCB routing and thermal environment.
No. The ring can form part of a sealing structure, but an IP rating must apply to a defined and tested connector or complete device assembly.
This depends on whether the device-side contact insert is independently sealed. Mated and unmated protection should be defined and tested separately.
Initial capture, seated retention and separation force should be specified separately in their defined measurement directions.
Customization can be reviewed according to the available installation space, electrical requirements, tooling feasibility, project quantity and validation scope.
Provide the four-contact Pin Map, voltage, current, signal type, available space, working stroke, sealing requirement and any available 2D or 3D drawings.
Review additional custom magnetic connector components for different pin counts and mechanical structures.
Submit the device model, Pin Map, electrical conditions, sealing requirements and available drawings through the Get Quote & Samples page .
CTP can review the four-contact layout, pogo pin working stroke, mating target, magnetic arrangement, sealing interface, housing structure and PCB, FPC or wire termination. Final electrical ratings, ingress protection, mating life and complete device performance must be confirmed through approved drawings and project-specific validation.
This product page presents a CTP magnetic connector configuration for engineering reference. Final dimensions, electrical ratings, materials, magnet structure, sealing level and reliability targets are not universal values; they are confirmed against the approved drawing, installation condition and model-specific validation plan.
CTP reviews the application and prepares a drawing or specification for approval before sample production. Test scope, acceptance criteria and report format should identify the model, sample status, method, conditions, result and review date.
Yes. Customization can cover geometry, contact layout, materials, cable construction, magnetic structure, sealing and appearance. Feasibility depends on the application and approved specification.
No. Current, voltage, resistance, temperature rise and ingress-protection claims apply only to the identified model and stated test conditions.
Timing is confirmed after the drawing, materials, tooling, sample quantity, validation scope and production requirements have been reviewed.
Submit your Pin Map, electrical requirements, available space, mating structure and project quantity for connector selection or custom development review.
Use the following engineering guides to compare contact count, contact allocation and connector layout before confirming the final product or customized design.
Review the complete selection path from contact count and electrical functions to connector shape.
View Main Guide →Compare one-contact special structures, complete two-contact circuits and third-contact functions.
Compare Low-Pin Designs →Determine whether four contacts are sufficient or whether a defined fifth electrical path is required.
Compare 4 Pin and 5 Pin →Calculate the contact budget and compare six-contact, multi-row and customized contact-array structures.
Compare High-Pin Designs →
