This mounting method is commonly used when the connector needs both electrical connection and mechanical positioning on the PCB. It can be applied to charging interfaces, battery contacts, docking equipment, industrial electronics, test fixtures, and other products that use repeated spring contact.
A reliable through-hole pogo pin assembly depends on more than the solder joint. PCB hole dimensions, pin positioning, plastic housing material, soldering temperature, flux control, working stroke, spring force, and post-solder inspection all affect the finished connector.
1. How is a through-hole pogo pin soldered to a PCB?
The termination tail of the pogo pin is inserted into a plated or defined PCB hole. Solder then connects the termination to the PCB conductor and fixes the contact in position.
Depending on the product and production volume, suitable processes may include:
manual soldering
wave soldering
selective soldering
other controlled through-hole soldering processes
The correct method depends on the pogo pin structure, housing material, PCB design, solder alloy, flux system, and production conditions.
A connector should not automatically be considered compatible with every soldering process.
2. PCB hole size should match the pogo pin tail
The relationship between the pogo pin termination diameter and PCB finished-hole diameter is one of the first dimensions to define.
If the hole is too small, excessive insertion force may:
damage the plating
deform the termination
stress the PCB hole
tilt the pogo pin
affect connector positioning
If the hole is too large, the pogo pin can move before soldering and may not remain perpendicular to the PCB.
This becomes more important in multi-pin connectors, where small positional errors across several contacts can affect pin pitch and final mating alignment.
The PCB designer should therefore consider the pogo pin tail tolerance, finished plated-hole tolerance, PCB manufacturing capability, and assembly method together.
3. Through-hole mounting does not replace mechanical positioning
Passing the pogo pin through a PCB hole helps locate the contact, but the PCB hole should not always be the only positioning feature.
Final accuracy can also be affected by:
PCB hole location
termination diameter tolerance
housing dimensions
assembly fixtures
soldering movement
connector tilt
For precision multi-pin connectors, the plastic housing can be used to control pin spacing, orientation, and assembled height.
Locating posts or other mechanical features may also be added when the mating position is sensitive.
4. Keep the pogo pin perpendicular to the mating surface
Pogo pins are designed primarily for axial compression.
If a pogo pin is soldered at an angle, the mating part can apply a lateral load to the plunger.
This may increase internal friction and can make the plunger return less smoothly. It may also create unequal compression between contacts in a multi-pin connector.
Assembly fixtures can help maintain:
correct pin pitch
vertical orientation
consistent exposed height
connector alignment
The connector should remain stable while the solder joint cools.
5. Consider PCB thickness and tail length together
A through-hole pogo pin needs enough termination length for the selected PCB and soldering process.
Too little usable tail length can make soldering difficult.
Excessive length can interfere with:
components on the opposite side of the PCB
enclosure space
wiring
PCB routing
mechanical structures
The design should therefore evaluate PCB thickness, finished hole, tail length, bottom-side clearance, and solder-joint geometry as one system.
6. Do not let the solder joint carry all mating force
When a pogo pin is compressed, the spring creates an opposite reaction force.
For a multi-pin connector, the spring forces of all contacts are combined.
If the connector relies only on solder joints for mechanical support, repeated mating can transfer unnecessary load into the PCB joints.
Depending on the application, housing shoulders, locating posts, mounting tabs, brackets, or other structures can help transfer the mating force into the mechanical assembly.
This becomes more important when the connector has many pins or higher spring force.
7. Plastic housing temperature limits are not universal
A fixed statement such as "all pogo pin housings withstand 260 ± 20°C" is not technically appropriate.
The acceptable soldering temperature depends on:
plastic resin
housing geometry
connector construction
soldering method
peak temperature
heating duration
number of thermal cycles
A material that tolerates a short peak temperature may not tolerate prolonged exposure at the same temperature.
The approved soldering profile should therefore be based on the actual connector material and manufacturing specification.
8. Soldering temperature is only one process parameter
Good soldering cannot be controlled by maximum temperature alone.
The complete thermal process can include:
preheating
heating rate
peak temperature
time above a specified temperature
solder-contact duration
cooling
Manual soldering also needs time control.
Leaving the soldering iron on the termination for too long can transfer excessive heat into the pogo pin body even if the set temperature appears acceptable.
The objective is to create adequate solder wetting while minimizing unnecessary heat exposure.
9. Heat can conduct into the pogo pin body
The pogo pin tail, barrel, and other metal parts conduct heat.
During soldering, heat applied near the PCB can travel toward the housing and internal connector structure.
Excessive heat can affect temperature-sensitive plastics and other materials.
This is another reason to define the complete soldering process instead of relying only on one maximum-temperature value.
10. Flux is a specific risk for spring-loaded contacts
Through-hole pogo pins differ from ordinary fixed PCB pins because they contain a moving plunger.
Flux should therefore remain in the intended soldering area.
If excessive flux reaches the barrel opening or plunger, residue may interfere with movement after soldering.
Possible symptoms include:
slow spring return
rough plunger movement
reduced working stroke
sticking or "stuck pin"
unstable electrical contact
For this reason, flux quantity, application position, connector orientation, and soldering method should be controlled.
11. Capillary action can pull liquid into the connector
Pogo pins contain very small gaps between moving components.
Liquids can migrate through these gaps by capillary action.
This means flux or cleaning liquid that appears to be some distance away from the plunger can still enter areas where it is not wanted.
Production engineers should therefore consider connector orientation and liquid application methods rather than simply increasing the amount of flux and cleaning afterward.
12. More flux does not mean better soldering
Excessive flux can create contamination without providing additional soldering benefit.
The required amount depends on the PCB finish, termination finish, solder alloy, soldering process, and flux chemistry.
For manual assembly, operator-to-operator variation can be significant.
For volume production, controlled dispensing or an automated process can improve consistency.
13. Cleaning after soldering requires caution
Cleaning can remove unwanted flux residue, but the cleaning process itself should not push liquid or contamination inside the pogo pin.
Cleaning agents must also be compatible with:
connector plating
plastic housing
adhesives
PCB materials
other components in the assembly
Preventing contamination during soldering is usually preferable to relying on aggressive cleaning afterward.
14. Keep solder away from the moving section
The soldering zone should be separated from the moving part of the pogo pin.
Solder should wet the PCB termination area without flowing toward the barrel opening or plunger.
Termination length, PCB position, connector orientation, and solder volume should be designed so the solder remains where it is needed.
15. Termination plating and contact plating serve different purposes
The pogo pin head needs a surface suitable for repeated electrical contact.
The PCB termination needs reliable solderability.
These two areas do not necessarily have identical functional requirements.
When developing a custom pogo pin, the manufacturer can specify different plating requirements for:
mating head
barrel
internal contact surface
PCB termination
The plating specification should therefore follow the function of each area instead of simply stating that the entire component is "gold plated."
16. The complete current path matters
A through-hole solder joint is only one part of the electrical path.
Current can travel through:
mating pad → plunger → internal pogo pin contact structure → barrel/termination → solder joint → PCB copper.
For higher-current applications, every section needs to be evaluated.
Important factors include:
conductive cross-section
internal contact resistance
termination diameter
solder-joint quality
PCB copper
trace width
number of parallel power contacts
allowable temperature rise
Adding more solder does not turn an undersized pogo pin into a high-current connector.
17. High-current through-hole pogo pins need PCB thermal design
When current increases, the PCB can become part of the thermal limitation.
A pogo pin may be capable of carrying the required current while the PCB pad, plated hole, copper trace, or nearby connection becomes too hot.
For this reason, current testing should evaluate the complete assembly.
Temperature-rise testing at the intended working compression is more useful than relying only on the nominal current rating of the individual pin.
18. Plastic housing design affects both soldering and operation
The plastic body can control:
pin pitch
orientation
electrical insulation
assembled height
connector position
multi-pin alignment
Its design must therefore work for both PCB assembly and later connector operation.
If the housing is placed too close to the soldering region, it may receive unnecessary heat.
If it provides insufficient mechanical support, individual pogo pins can move or tilt during soldering.
19. Avoid unnecessary compression during soldering
The plunger should not be used as the primary point for clamping or holding the connector during soldering.
Fixtures should preferably locate the housing or another designated mechanical feature.
This protects the moving contact from impact and avoids unnecessary loading while the assembly is hot.
The plunger head should also be protected from solder splash and tooling damage.
20. Manual soldering requires a defined process
Manual soldering can be appropriate for prototypes, engineering samples, repairs, and smaller production quantities.
Its main weakness is process variation.
Different operators may use different:
soldering times
temperatures
flux quantities
solder amounts
contact angles
A work instruction should therefore define the process for the specific connector.
After soldering, the pogo pin should still compress and return smoothly.
21. Automated soldering improves repeatability when the product is suitable
For volume production, automated or controlled soldering can reduce some operator variation.
Dongguan Xinteng Electronics states that its production equipment includes automatic soldering equipment used for pogo pin and PCB welding, together with conductivity testing, dimensional measurement, and load/stroke testing equipment.
Automation does not remove the need for process validation. PCB design, flux control, connector orientation, soldering profile, and post-solder testing still need to match the actual product.
22. Check pogo pin movement after soldering
After PCB soldering, the plunger should still move through its intended working stroke and return normally.
A pin that becomes rough or sticks can indicate:
flux contamination
solder contamination
barrel damage
housing deformation
connector tilt
side loading
Checking only the appearance of the solder joint may miss these problems.
23. Check electrical performance after soldering
Depending on the application, post-solder inspection can include:
continuity
contact resistance
connector position
pin height
plunger movement
spring return
solder wetting
solder bridging
Higher-current products may also require temperature-rise testing.
Connectors exposed to repeated mating or vibration may require additional life or continuity testing.
24. Multi-pin connectors require height consistency
A multi-pin pogo connector can pass visual inspection while still having uneven working compression.
Possible causes include:
PCB bending
housing warpage
connector tilt
solder-height variation
pin-height variation
If the connector is tilted, one group of pogo pins may be heavily compressed while another group has insufficient contact force.
Pin height, connector coplanarity, PCB flatness, and mating-surface position should therefore be considered together.
25. Why does a pogo pin sometimes stick after soldering?
A stuck pogo pin does not automatically mean the internal spring is defective.
Possible causes include flux contamination, housing deformation, solder entering an unwanted area, barrel-opening damage, side loading, or incorrect assembly positioning.
The failure should be inspected before replacing the pogo pin.
Otherwise the same assembly problem may appear again.
26. Why can electrical resistance become unstable after PCB assembly?
If a connector works before soldering but becomes unstable afterward, the complete connection should be checked.
Potential causes include:
incomplete solder wetting
contaminated pogo pin
incorrect working compression
connector misalignment
damaged plating
poor PCB through-hole connection
stressed solder joint
Resistance should preferably be measured with the pogo pin compressed to the actual working position.
27. Through-hole, SMT, and wire-solder structures are used for different designs
Through-hole pogo pins are not automatically better than SMT contacts.
Through-hole mounting can provide good PCB positioning and mechanical engagement, but it consumes PCB-hole space and may limit routing or components on the opposite side.
SMT pogo pins can be better suited to surface-mount production and layouts that need an uninterrupted PCB backside.
Solder-tail or solder-cup structures are useful when a wire needs to connect directly to the pogo pin.
The termination style should follow the final product architecture.
28. Customizing a through-hole pogo pin for the PCB
For a custom through-hole connector, useful project information includes:
PCB thickness
finished PCB-hole diameter
pogo pin mounting height
mating distance
working compression
spring force
current and voltage
number of contacts
pin pitch
available space above and below the PCB
soldering method
mating-cycle requirement
environmental conditions
The pogo pin termination diameter, tail length, plunger geometry, barrel dimensions, working stroke, spring force, plating, and plastic housing can then be designed around the actual PCB and equipment.
This is more reliable than selecting a pogo pin first and forcing the PCB structure to accommodate it.
Why Choose Dongguan Xinteng Electronics for a Custom Through-Hole Pogo Pin Connector?
For a custom PCB connector, the useful question is not simply whether the supplier can manufacture an individual pogo pin. The supplier also needs to understand how the pogo pin, PCB, housing, soldering process, and final mating structure interact.
Dongguan Xinteng Electronics states that it develops and manufactures pogo pins, pogo pin connectors, magnetic connectors, magnetic charging cables, and precision hardware components, allowing several related connector parts to be handled within the same development process.
Custom development from product requirements
Xinteng's website describes support for drawing design, machining, sample testing, and customized connector solutions. Its product information also lists DIP, SMT, bent, wire-soldered, and other pogo pin structures as customization options.
Customers can therefore provide information such as:
2D or 3D drawings
PCB layouts
existing samples
equipment installation dimensions
electrical requirements
working stroke
spring-force requirement
mating structure
The pogo pin structure can then be adjusted around the actual application instead of relying only on a standard catalogue part.
PCB soldering and assembly capability
The company states that its manufacturing equipment includes automatic soldering machines used for pogo pin and PCB assembly. This is relevant to through-hole and other PCB-mounted connector projects because connector design and production soldering can be considered together.
For a custom project, this can include evaluating tail dimensions, PCB mounting position, housing design, assembly fixtures, and soldering access before the final connector drawing is released.
Dimensional, electrical, and stroke testing
According to the company's website, its inspection equipment includes dimensional measuring systems, conductivity testing equipment, and load/stroke testing equipment used for pogo pin and connector inspection.
These measurements are directly relevant to through-hole pogo pin assemblies because PCB reliability depends on more than solder-joint appearance. Pin height, working stroke, electrical continuity, and mechanical movement also need to remain within the specified range.
Pogo pins and complete connector assemblies
Some projects require only an individual through-hole spring pin.
Others require a complete assembly containing the pogo pins, plastic housing, PCB, magnets, wires, or precision-machined components.
Xinteng's published product range covers pogo pins, pogo pin connectors, magnetic connectors, magnetic cables, and precision hardware components, which allows a custom project to be evaluated at connector-assembly level rather than treating each component independently.
The company also states that its products are managed under an ISO quality system and that product materials are designed to comply with RoHS, REACH, and halogen-free environmental requirements where specified. These are supplier-published claims and should be confirmed against the certificates and specifications required for a particular project.
For OEM or non-standard projects, customers can submit drawings, samples, PCB information, or application requirements for engineering evaluation before prototype production.
FAQ
1. What is a through-hole pogo pin?
A through-hole pogo pin has a termination that passes through a PCB hole and is soldered to the board. It is useful when the design requires PCB positioning and mechanical engagement in addition to electrical connection.
2. Can every through-hole pogo pin withstand a 260°C soldering process?
No. Permitted temperature and exposure time depend on the pogo pin structure, housing resin, soldering process, and connector specification. The thermal profile should be validated for the actual product rather than applying one universal temperature limit.
3. Why can a through-hole pogo pin become stuck after soldering?
Flux contamination is one possible cause, but housing deformation, side loading, solder contamination, barrel damage, or assembly misalignment can also restrict plunger movement. Both the soldering process and mechanical assembly should be inspected.
4. Can Dongguan Xinteng Electronics customize through-hole pogo pin connectors from drawings or samples?
The company states that it provides customized pogo pin solutions and supports drawing design, machining, sample testing, and several mounting structures including DIP designs. For a new project, providing the PCB layout, installation dimensions, electrical requirements, working stroke, and sample or 2D/3D drawing can help engineers evaluate the connector structure more accurately.
