01
Pin Map and Contact Functions
Define the function of each power, return, signal, control or detection contact.
CTP 3 Pin Round Waterproof Magnetic Pogo Pin Connector Pair combines three electrical contacts, a spring-loaded pogo pin side, a mating target side and a compact circular housing for sealed-device integration. The three contacts can be assigned to power, return, detection, identification or project-specific control functions according to the customer Pin Map. Waterproof performance depends on the complete sealing boundary, connector-to-device interface and tested mating condition. Final dimensions, working stroke, current, voltage, magnetic retention, ingress protection and mating life must be confirmed using the approved drawing and complete customer assembly.
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 3 Pin Round Waterproof Magnetic Pogo Pin Connector Pair combines three electrical contacts, a spring-loaded pogo pin side, a mating target side and a compact circular housing for sealed-device integration. The three contacts can be assigned to project-specific power, return, detection, identification or control functions. Waterproof performance depends on the complete sealing boundary, connector installation, mating state and customer enclosure. Final dimensions, working stroke, electrical ratings, magnetic retention, ingress protection and mating life must be confirmed using the approved drawing and complete customer assembly.
This 3 pin waterproof magnetic pogo pin connector is designed for electronic equipment that requires a removable three-contact electrical interface while maintaining a project-specific environmental sealing strategy.
The connector uses a compact round structure with three electrical contact positions. One side contains spring-loaded pogo pin contacts, while the opposing side provides corresponding mating targets.
Magnetic attraction can assist connector capture and attachment, while the housing geometry, sealing surfaces and mechanical stops should control the final mating position.
Waterproof performance should not be attributed to the pogo pins alone. The complete protection boundary includes the connector housing, connector-to-device joint, sealing components, termination area and customer enclosure.
| Connector Element | Product Structure | Engineering Requirement |
|---|---|---|
| Contact Count | Three electrical contacts | Define the function and electrical state of every contact |
| Pogo Pin Side | Three spring-loaded conductive contacts | Define free height, working stroke and contact force |
| Target Side | Three corresponding mating targets | Define target material, finish, dimensions and flatness |
| Connector Shape | Compact round interface | Confirm diameter, height and installation envelope |
| Magnetic Structure | Magnet-assisted circular mating structure | Define capture, seated retention and separation requirements |
| Sealing Structure | Project-specific connector and enclosure sealing interface | Define gasket, compression, potting or other required sealing method |
| Termination | Board-side or project-specific conductive terminals | Confirm PCB, FPC, wire or solder termination by drawing |
A three-contact magnetic connector offers more flexibility than a basic two-wire power interface while remaining compact.
Possible contact functions include:
| Architecture | Example Contact Allocation | Primary Engineering Review |
|---|---|---|
| Power + Detection | Power, return and device detection | Power-enable timing and seating detection |
| Power + Identification | Power, return and accessory identification | Identification tolerance and wrong-accessory response |
| Power + Control | Power, return and project-specific control | Logic voltage and fault protection |
| Detection Interface | Detection, reference and control contact | Detection threshold and partial-mating behaviour |
These are example architectures only. The final three-contact Pin Map must be defined according to the customer schematic.
A waterproof magnetic connector should be treated as part of a complete enclosure system rather than as an isolated waterproof component.
The protection boundary may include:
An ingress-protection rating should therefore apply to a defined and tested connector or complete customer assembly under stated test conditions.
A connector may behave differently when the two mating halves are fully connected, disconnected or partially seated.
| Connector State | Required Waterproof Review |
|---|---|
| Fully Mated | Verify the intended sealing surfaces and compression condition |
| Unmated | Determine whether each connector half must independently resist water ingress |
| Partially Mated | Evaluate leakage paths before final gasket or housing compression is reached |
| After Repeated Mating | Evaluate seal wear, contamination and compression-set effects |
The project specification should clearly state which connector states are required to meet the environmental protection target.
In a sealed magnetic connector, the final mating position may simultaneously determine both pogo pin compression and gasket compression.
This creates two mechanical requirements that must remain inside their approved ranges.
| Mechanical Variable | Too Low | Correct Range | Too High |
|---|---|---|---|
| Pogo Pin Compression | Intermittent electrical contact | Stable contact force | Spring bottoming or target damage |
| Seal Compression | Possible leakage path | Intended sealing condition | Excessive gasket stress or compression set |
Final housing dimensions and mechanical stops should therefore control both conditions rather than relying on magnetic force alone.
A simplified working-stroke relationship is:
S = Hfree - Hseated
where:
The dimensional stack may include:
Magnetic attraction may help pull the connector halves together, but the magnets should not be used as the only method for determining gasket compression or pogo pin working stroke.
| Mating Function | Recommended Control |
|---|---|
| Initial Capture | Magnet layout and approach geometry |
| Orientation | Housing geometry and magnetic polarity |
| Final Alignment | Mechanical datums and mating surfaces |
| Pogo Pin Compression | Defined mechanical stop |
| Seal Compression | Housing geometry and controlled gasket compression |
| Seated Retention | Magnetic structure and customer mechanical support |
The presence of moisture around exposed conductive contacts creates additional electrical states that should be considered at system level.
The project should evaluate:
Circuit-level current limiting, detection or power-enable logic may be required depending on the final product architecture.
Magnetic attraction can hold the connector near its final position before all three contacts and sealing surfaces are fully seated.
| Condition | Possible Risk | Required Review |
|---|---|---|
| One Contact Touches First | Unexpected detection or power sequence | Pin Map and approach angle |
| Two Contacts Touch First | Incomplete circuit state | Contact-height and target-position tolerance |
| Captured but Not Fully Seated | Electrical contact without full sealing compression | Independent full-seating detection where required |
| Laterally Offset | Contact reaches an unintended conductive region | Target dimensions and maximum credible offset |
| Removal Under Load | Transient voltage or contact arcing | Power-disable sequence and powered-endurance testing |
A sealed connector may dissipate heat differently from an open connector. Current capability should therefore be evaluated in the representative customer assembly.
A simplified complete-path resistance is:
Rpath = Rhost-PCB + Rtermination + Rpogo + Rinterface + Rtarget + Rdevice-PCB
The voltage drop is:
Vdrop = I × Rpath
The resistive loss is:
Ploss = I² × Rpath
The test should define:
For this reason, an 8 A rating or another current value should only be assigned to the exact tested connector configuration.
A waterproof connector may experience dimensional and surface changes during normal use.
Where relevant, validation should consider:
| Parameter | Product Definition |
|---|---|
| Product Type | 3 pin round waterproof magnetic pogo pin connector pair |
| Contact Count | Three electrical contacts |
| Connector Shape | Compact round magnetic interface |
| Mating Structure | Spring-loaded pogo pin side with corresponding target side |
| Pin Map | Project-specific power, return, detection, identification or control |
| Overall Dimensions | Confirm using the approved drawing |
| Contact Arrangement | Confirm contact positions and spacing using the approved drawing |
| Working Stroke | Confirm minimum, nominal and maximum compression |
| Seal Structure | Project-specific gasket, potting, overmolding or enclosure interface |
| Seal Compression | Define according to the selected sealing material and housing design |
| Voltage | Model- and circuit-specific |
| Continuous Current | Confirm through voltage-drop and temperature-rise testing |
| Contact Resistance | Report with test current, target, stroke and measurement method |
| Magnetic Performance | Capture, seated retention and separation force are specified separately |
| Mating Life | Defined by working stroke, load and acceptance criteria |
| Ingress Protection | Applies only to a defined and tested connector or complete customer assembly |
| Application | Possible Connector Role | Primary Engineering Focus |
|---|---|---|
| Outdoor Electronics | Power, charging or detection interface | Rain, contamination and enclosure sealing |
| Smart-Home Equipment | Removable power or control interface | Moisture, cleaning and repeated mating |
| Portable Electronics | Power, detection or accessory connection | Compact size and exposed-contact protection |
| Personal Care Devices | Charging or removable module interface | Moisture, cleaning and complete-device sealing |
| Industrial Handheld Devices | Charging, detection or control connection | Ingress, vibration and contamination |
| Custom Sealed Electronics | Project-specific removable electrical interface | Complete sealing boundary and mating-state validation |
These applications are examples. Final suitability depends on the required protection level, electrical load, Pin Map and complete equipment design.
| Requirement | Recommended Evaluation |
|---|---|
| Pin Map | Confirm the function of all three contacts |
| Working Stroke | Verify minimum, nominal and maximum pogo pin compression |
| Seal Compression | Verify the sealing structure across dimensional tolerances |
| Contact Resistance | Measure with defined target, stroke and test current |
| Voltage Drop | Measure the complete power path under intended load |
| Temperature Rise | Evaluate inside the representative sealed assembly |
| Magnetic Capture | Evaluate connector approach and alignment |
| Retention and Separation | Measure in intended use and removal directions |
| Fully Mated Ingress | Test the defined complete assembly in its final seated state |
| Unmated Ingress | Test where independent protection is required |
| Partial Mating | Evaluate electrical contact before complete sealing engagement |
| Mating Endurance | Repeat mechanical cycles before re-evaluating sealing performance |
| Environmental Exposure | Evaluate required moisture, temperature, contamination and cleaning conditions |
| Input | Information to Provide |
|---|---|
| Pin Map | Function of all three contacts |
| Electrical Conditions | Voltage, continuous current, peak current and signal type |
| Ingress Requirement | Required protection condition and connector mating state |
| Mechanical Space | Maximum diameter, height and restricted areas |
| Working Stroke | Minimum, nominal and maximum pogo pin compression |
| Sealing Structure | Gasket, potting, overmolding or customer-enclosure sealing method |
| Mating Direction | Approach, final seating and removal direction |
| Magnetic Requirements | Capture, seated retention and separation conditions |
| Environment | Water, humidity, condensation, dust and cleaning exposure |
| Termination | PCB, FPC, wire or project-specific connection |
| Project Files | 2D drawing, 3D model, schematic, PCB layout or device assembly |
It is a magnetic spring-contact connector with three electrical contact positions that can be integrated into a project-specific sealed device interface.
They can be assigned to power, return, detection, identification, control or other project-specific electrical functions according to the customer Pin Map.
No. An ingress-protection rating must apply to a defined and tested connector or complete customer assembly under stated test conditions.
It can be designed for an unmated protection requirement, but this must be specifically defined and validated. A connector that is protected when fully mated is not automatically protected to the same level when unmated.
The final seated position may simultaneously determine electrical contact compression and gasket compression. Both must remain within their approved mechanical ranges.
No universal 8 A capability should be assumed. Current depends on contact geometry, working stroke, targets, termination, PCB routing, ambient temperature and the thermal behaviour of the sealed assembly.
Capture force, seated retention and separation force should be specified and measured separately under defined conditions.
Outdoor equipment is a possible application, but final suitability depends on the complete enclosure, sealing boundary, operating environment and project-specific validation.
Provide the three-contact Pin Map, voltage, current, required ingress protection condition, available space, working stroke, sealing structure and available project drawings.
Review additional custom magnetic connector components for different contact counts, waterproof structures and mating layouts.
Submit the three-contact Pin Map, ingress requirement, electrical conditions, available space and drawings through the Get Quote & Samples page .
CTP can review the three-contact layout, pogo pin working stroke, mating targets, round magnetic structure, sealing interface and PCB, FPC or wire termination. Final electrical ratings, ingress protection, magnetic retention, 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 →
