01
Pin Map and Contact Functions
Define the function of each power, return, signal, control or detection contact.
CTP 4 Pin Ring Magnetic Pogo Pin Connector Pair combines four inline electrical contacts, a spring-loaded pogo pin side, a flat target side, an annular magnetic structure and mounting features for PCB or enclosure integration. The four contacts can be assigned to power, return, detection, identification, control or project-specific signal functions according to the customer Pin Map. Final dimensions, working stroke, voltage, current, magnetic retention, mating life and environmental performance must be confirmed using the approved connector 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 4 Pin Ring Magnetic Pogo Pin Connector Pair combines four inline electrical contacts, a spring-loaded pogo pin side, a flat target side, an annular magnetic structure and mounting features for PCB or enclosure integration. The Pin Map, dimensions, working stroke, electrical ratings, magnetic retention, mating life and environmental performance must be confirmed using the approved connector drawing and complete customer assembly.
This 4 pin ring magnetic pogo pin connector is designed for custom electronic equipment requiring a removable power, charging, detection or signal interface.
The connector pair contains four electrical contact positions arranged in one row. One connector half uses spring-loaded pogo pin contacts, while the opposing half provides flat mating targets.
The surrounding annular magnetic structure may assist connector approach, orientation and seated retention. Final contact alignment and pogo pin compression should still be controlled by the connector housing, locating features and mechanical stops.
The visible mounting ears and board-side terminals allow the connector to be reviewed for PCB, enclosure, docking-base or project-specific module integration.
| Connector Element | Product Structure | Engineering Requirement |
|---|---|---|
| Contact Count | Four electrical contacts | Define the function and electrical state of every contact |
| Pogo Pin Side | Four spring-loaded conductive contacts | Define free height, working stroke and contact force |
| Target Side | Four flat mating targets | Define target material, finish, flatness and mechanical support |
| Contact Layout | Single-row inline arrangement | Confirm pitch and target dimensions using the product drawing |
| Magnetic Structure | Annular or ring-shaped magnetic mating structure | Define capture, seated retention and separation requirements |
| Mounting Features | Side mounting ears on the device-side housing | Confirm hole size, spacing and mounting method |
| Termination | Board-side conductive terminals | Confirm PCB hole pattern, soldering process and assembly datum |
Four contacts do not represent one universal circuit. The correct contact allocation depends on the customer device, mating accessory and required operating states.
Possible contact functions include:
Power return, signal reference, shielding and any metal housing should not automatically be treated as the same electrical node.
| Interface Architecture | Example Contact Allocation | Primary Engineering Review |
|---|---|---|
| Charging and Detection | Power, return, detection and identification | Power-enable sequence, polarity and partial mating |
| Power and Control | Power pair plus two project-specific control contacts | Logic voltage, return path and fault protection |
| Parallel Power Paths | Two positive contacts and two return contacts | Current sharing, voltage drop and temperature rise |
| Power and Low-Speed Signal | Power, return and two signal contacts | Signal reference, electrical protection and reconnection behaviour |
| Test or Service Interface | Power, return and two diagnostic contacts | Fixture alignment, access control and mating sequence |
These allocations are examples only. The final Pin Map must be developed from the actual host and accessory circuits.
Four conductive contacts do not automatically prove USB, UART, I2C or another communication capability.
The complete communication channel may include:
Host Controller → Host PCB → Protection Components → Pogo Pin Contacts → Flat Targets → Accessory PCB → Accessory Controller
Communication capability depends on:
Pin count and low DC contact resistance do not independently prove data performance.
The annular magnetic layout can assist initial connector capture and help pull the two connector halves toward the intended position.
Magnetic attraction should not be used as the only feature controlling final alignment or pogo pin compression.
| Interface Function | Recommended Control |
|---|---|
| Initial Capture | Magnet arrangement and approach geometry |
| Orientation Control | Housing shape, locating features and magnetic polarity |
| Final Alignment | Housing datums, guides and mating surfaces |
| Pogo Pin Compression | Mechanical stops and complete dimensional tolerance stack |
| Seated Retention | Magnetic structure and customer-device support |
| Connector Removal | Defined separation direction and release-force requirement |
Initial capture, seated retention and separation force should be specified and measured separately because they describe different connector behaviours.
The spring-loaded contacts require controlled compression against the flat mating targets.
A simplified working-stroke calculation is:
S = Hfree - Hseated
where:
The tolerance calculation may include:
| Stroke Condition | Possible Result |
|---|---|
| Insufficient Compression | Intermittent contact, unstable detection or resistance variation |
| Approved Working Stroke | Intended contact force and electrical condition |
| Excessive Compression | Spring bottoming, target indentation, housing load or PCB stress |
| Unequal Compression | Different resistance and uneven current distribution |
The mounting features can support connector location and mechanical retention in the customer product.
The approved drawing should identify:
Pogo pins, flat targets and PCB solder joints should not carry the complete structural load of a removable cable, dock or accessory.
A preferred mechanical load path is:
Accessory → Connector Housing or Mounting Features → Customer Device Enclosure
rather than:
Accessory → Magnets → Pogo Pins → Targets → PCB Terminals
The current capability of a 4 pin magnetic connector cannot be determined from pin count or product appearance alone.
Electrical performance depends on:
A simplified complete-path resistance is:
Rpath = Rhost-PCB + Rtermination1 + Rpogo + Rinterface + Rtarget + Raccessory-PCB
The voltage drop is:
Vdrop = I × Rpath
The resistive power loss is:
Ploss = I² × Rpath
The intended current should be confirmed through complete-path voltage-drop and temperature-rise testing.
Some four-contact interfaces may connect two contacts in parallel for positive power and two contacts in parallel for return.
Parallel contacts may not carry equal current because of:
Individual contact current and temperature should be measured under the maximum intended load.
Magnetic attraction may retain the connector near its intended position before all four contacts reach their approved working stroke.
| Partial-Mating Condition | Possible Risk | Required Review |
|---|---|---|
| One Side Contacts First | Unexpected power or signal sequence | Approach angle and contact-height tolerance |
| Laterally Offset Mating | A pogo pin reaches an adjacent target | Contact pitch, target width and maximum credible offset |
| Magnetically Retained but Not Fully Seated | False detection or unstable power | Independent full-seating verification |
| Wrong Orientation | Incorrect Pin Map or polarity condition | Mechanical coding and magnetic polarity |
| Conductive Contamination | Short circuit or leakage between contacts | Power control and foreign-object protection |
| Removal Under Load | Transient voltage, arcing or interrupted communication | Power-disable sequence and powered-endurance validation |
The ring-shaped magnetic structure does not independently prove waterproof or IP67 performance.
The complete environmental boundary may include:
Any IP, salt-spray or corrosion claim should identify the exact sample, test method, mating state, exposure condition and acceptance criteria.
| Parameter | Product Definition |
|---|---|
| Product Type | 4 pin ring magnetic pogo pin connector pair |
| Contact Count | Four electrical contacts |
| Contact Arrangement | Single-row inline layout |
| Mating Structure | Spring-loaded pogo pin side with flat target side |
| Magnetic Layout | Annular magnetic structure for project-specific capture and retention |
| Mounting Structure | Device-side mounting ears and board terminals |
| Pin Map | Project-specific power, return, detection, identification and 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 pogo pin compression |
| Contact Force | Report at a defined 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, target, stroke and measurement method |
| Magnetic Performance | Capture, seated retention and separation force are specified separately |
| Mating Life | Defined by working stroke, electrical load, target and acceptance criteria |
| Contact Finish | Confirm separately for pogo pins, targets and PCB terminals |
| Ingress Protection | Applies only to a defined and tested connector or complete customer device |
| Application | Possible Connector Role | Primary Engineering Focus |
|---|---|---|
| Home Appliances | Charging, docking, detection or detachable module interface | Moisture, repeated use and enclosure integration |
| Humidifiers and Water-Adjacent Equipment | Removable power or control connection | Complete sealing boundary and condensation exposure |
| Portable Electronics | Power, identification and project-specific signal interface | Retention, Pin Map and exposed-contact protection |
| Charging Docks | Power, return, detection and accessory identification | Alignment, power sequence and partial mating |
| Industrial Handheld Equipment | Charging, control or service interface | Mounting, vibration and contact stability |
| Custom Sealed Electronics | Flush or shallow removable electrical interface | Feedthrough design and complete enclosure validation |
These applications are examples. Final suitability depends on the Pin Map, electrical load, mechanical assembly and environmental requirements.
| Requirement | Recommended Evaluation |
|---|---|
| Pin Map | Confirm the function and electrical state of all four contacts |
| Dimensions and Pitch | Verify contact pitch, target positions and overall dimensions |
| Mounting Structure | Verify mounting holes, PCB terminals and housing datums |
| Working Stroke | Verify minimum, nominal and maximum contact compression |
| Contact Resistance | Measure with a defined current, target, stroke and sample condition |
| Voltage Drop | Measure the complete electrical path at intended current |
| Temperature Rise | Evaluate contacts, PCB terminals, solder joints and housing |
| Parallel Current Sharing | Measure individual contact current and temperature where applicable |
| Magnetic Capture | Evaluate approach and orientation behaviour |
| Retention and Release | Measure force in the intended use and removal directions |
| Partial Mating | Test tilted, offset and retained-but-unseated states |
| Short Circuit | Evaluate moisture, metal objects and adjacent-contact bridging |
| Mechanical Endurance | Use defined stroke, speed, target and acceptance criteria |
| Powered Endurance | Evaluate mating and separation under the intended electrical state |
| Environmental Exposure | Test representative moisture, condensation, dust and cleaning conditions |
| 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 |
| Mounting Method | Screw, locating pin, PCB or customer-defined structure |
| Contact Pitch | Required pitch and mating-target dimensions |
| Mating Direction | Approach, final seating and removal direction |
| Working Stroke | Minimum, nominal and maximum pogo pin compression |
| Termination | PCB, FPC, wire or project-specific connection |
| Magnetic Requirements | Capture, seated retention and separation conditions |
| Environment | Temperature, humidity, condensation, dust and cleaning exposure |
| Validation | Resistance, temperature rise, mating life and environmental 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 spring-loaded pogo pin side and a flat target side. The final supplied scope should be confirmed in the quotation and approved drawing.
It describes the annular magnetic mating structure surrounding the contact region. It does not independently define the electrical rating or waterproof performance.
The contacts can be assigned to project-specific power, return, detection, identification, control or signal functions according to the customer Pin Map.
No. USB or another communication protocol requires compatible controllers, PCB routing, protection components and complete channel validation.
No universal rating should be assumed. Voltage and current depend on the selected contact structure, Pin Map, working stroke, PCB termination and thermal environment.
No. An ingress-protection rating must apply to a defined and tested connector or complete customer enclosure under stated conditions.
Initial capture, seated retention and separation force should be specified and measured separately in their defined directions.
Customization can be reviewed according to the available space, Pin Map, mounting method, tooling feasibility, project quantity and validation requirements.
Provide the four-contact Pin Map, voltage, current, available space, mounting method, working stroke, environmental requirements and available drawings.
Review additional custom magnetic connector components for different contact counts and mating structures.
Submit the Pin Map, electrical conditions, mounting requirements and available drawings through the Get Quote & Samples page .
CTP can review the four-contact layout, pogo pin working stroke, mating-target structure, annular magnetic arrangement, mounting features and PCB, FPC or wire termination. Final electrical ratings, signal performance, mating life, environmental protection 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 →
