Pogo Pins are spring-loaded electrical contacts used where electronic equipment requires a compact connection, controlled compression and repeated electrical contact. Their small size and telescopic structure make them suitable for products with limited PCB space or mechanical assemblies that cannot use a conventional plug-and-socket connector.
Selecting the correct Pogo Pin is only part of the design. The way the pin is mounted has a direct effect on PCB layout, assembly efficiency, contact alignment and long-term reliability.
The most common installation methods include surface mounting, through-hole or solder-tail mounting, and floating double-ended installation. Bent-tail and horizontal structures are also used when the PCB or housing leaves insufficient space for a vertical contact.
1. Surface mount Pogo Pin installation
Surface mount, usually referred to as SMT, installs the Pogo Pin directly onto a PCB solder pad.
The bottom of an SMT Pogo Pin is normally designed with a flat soldering surface. The component is positioned on the PCB and soldered during the assembly process.
This structure is useful when the product requires a low installation height or when there is not enough PCB space for a long through-hole tail.
Vertical SMT mounting
In a vertical installation, the Pogo Pin stands perpendicular to the PCB.
The spring-loaded plunger faces the mating contact while the flat bottom is soldered to the PCB pad.
This arrangement is common when two components are stacked vertically or when the mating surface approaches the PCB from above.
The PCB pad size, solder joint and surrounding housing should keep the Pogo Pin perpendicular after assembly. If the pin tilts, the plunger may receive side loading during compression.
Pogo Pins generally work more reliably when the compression force acts along the axis of the pin.
Horizontal SMT mounting
Some products do not have enough vertical space for a conventional upright Pogo Pin. A horizontal or side-contact structure can be used instead.
The electrical connection principle remains similar, but the pin body and PCB mounting arrangement are designed around a different contact direction.
This can be useful in thin electronic products or mechanical assemblies where the mating component approaches from the side.
The PCB layout and surrounding housing need to prevent the connector from moving during repeated compression.
SMT Pogo Pins with locating features
Some surface mount Pogo Pins include locating pins or mechanical positioning features.
These features help maintain the component position before and during soldering. They can also reduce the possibility of rotation or lateral movement when the Pogo Pin is repeatedly compressed.
This becomes more important in multi-pin connector assemblies because the relative position between several contacts must remain consistent.
For a custom connector, the locating structure can be designed together with the PCB holes and plastic or metal housing according to the customer's drawings.
2. Through-hole and straight solder-tail installation
A straight solder-tail Pogo Pin has an extended terminal at the bottom. The tail passes through a PCB hole and is soldered to the board.
This installation method is often called through-hole or DIP mounting.
Compared with a purely surface-mounted contact, the tail provides additional mechanical positioning because part of the Pogo Pin extends through the PCB.
This can be useful when the contact receives repeated compression or when the connector assembly requires stronger mechanical retention.
How straight-tail mounting works
The PCB first needs a hole that matches the tail dimensions.
During assembly, the tail is inserted into the hole and the Pogo Pin is positioned at the required height. The terminal is then soldered to create the electrical connection and secure the component.
The relationship between the PCB hole, tail diameter and housing position needs to be controlled.
A hole that is excessively large may allow the contact to tilt before soldering. An overly tight hole can make assembly difficult or place unnecessary stress on the terminal.
When through-hole installation is useful
Through-hole Pogo Pins are often considered when mechanical stability is more important than minimizing PCB penetration.
They are also convenient when the board design already supports plug-in components or when the connector needs a clear mechanical reference during assembly.
The final choice still depends on PCB thickness, available space and the direction of the mating force.
3. Bent-tail and right-angle installation
A straight vertical contact does not fit every product.
When the mating direction and PCB position are perpendicular to each other, the lower terminal can be bent to create a right-angle or custom-angle mounting structure.
This gives the designer more freedom when arranging the PCB and connector inside a restricted enclosure.
For example, the PCB may be installed vertically while the external contact surface needs to face horizontally. A bent-tail Pogo Pin allows these two directions to be connected without adding a separate cable.
Points to consider with bent-tail structures
The tail geometry needs to remain stable during assembly.
If the bend position or angle varies excessively, the plunger position can shift relative to the mating pad. This becomes particularly noticeable in multi-pin connectors with a small contact pitch.
The mechanical housing should therefore locate the Pogo Pins rather than depending entirely on the solder joint to control their final position.
When space is very limited, a custom terminal shape can be produced according to the PCB and enclosure layout instead of forcing the equipment designer to change the surrounding structure.
4. Floating and double-ended Pogo Pin installation
Floating installation commonly uses a double-ended spring-loaded contact.
Unlike a conventional Pogo Pin soldered permanently to one PCB, a double-ended pin can make contact at both ends.
The component can be positioned between two conductive surfaces or two PCBs. Compression from both sides maintains electrical contact without requiring the pin itself to be soldered directly to either mating surface.
This gives engineers additional flexibility in board-to-board connections.
How a double-ended Pogo Pin works
A typical double-ended design has spring-loaded contact surfaces at both ends.
When two boards or conductive modules move toward each other, the Pogo Pin compresses and establishes an electrical path between them.
A holder or housing normally controls the pin position.
Because the Pogo Pin is not necessarily soldered to the mating surfaces, dimensional control of the housing becomes particularly important. The pin must stay aligned with both contact pads throughout assembly and operation.
Advantages of floating installation
Floating connections can simplify assemblies where soldering is inconvenient or where two modules need to remain separable.
They can also compensate for a limited amount of assembly tolerance because the spring-loaded ends can absorb small height differences.
However, the available compression should not be used as a substitute for poor mechanical tolerance control.
The connector still needs a defined working height so that both ends maintain sufficient contact pressure without exceeding the intended stroke.
How to choose the correct Pogo Pin installation method
The mounting method should be selected after the mechanical structure of the product is understood.
PCB orientation is one of the first considerations. A vertically stacked assembly may work well with an SMT or straight-tail Pogo Pin, while a side-facing interface may require a horizontal or bent-tail design.
Available installation height is another factor.
A through-hole structure needs space below the PCB, whereas an SMT contact can reduce the amount of board penetration. A double-ended contact requires enough room between the two mating surfaces for the housing and spring movement.
The designer should also consider how frequently the Pogo Pin will be compressed and how much force will be transferred to the PCB.
Working stroke should be considered during installation
A Pogo Pin should normally operate within its specified working stroke rather than at its fully extended or fully compressed position.
If the mating surface barely compresses the plunger, contact pressure may be insufficient when dimensional variations occur.
Excessive compression creates the opposite problem. The spring and internal structure may receive loads beyond the intended operating condition.
PCB height, housing dimensions and mating component position should therefore be calculated together.
For a connector containing several Pogo Pins, the housing should also help keep the compression of each pin reasonably consistent.
Avoid excessive side loading
Pogo Pins are designed primarily for axial compression.
When the mating surface approaches the plunger at a large angle, lateral force can act on the plunger and barrel.
Repeated side loading may affect smooth movement and increase mechanical wear.
Locating posts, guide structures or connector housings can be used to align the two mating components before the Pogo Pins reach their working compression.
This is particularly useful in non-standard multi-pin connector assemblies.
PCB soldering and mechanical support
The solder joint provides the electrical connection, but it should not always be expected to carry every mechanical load generated during mating.
If a connector is pressed frequently, a housing can help transfer part of the load to the PCB or equipment structure.
For SMT designs, pad geometry and solderability need to match the Pogo Pin terminal.
For through-hole structures, PCB hole dimensions and solder filling should be considered during the board design stage.
The appropriate method depends on the connector geometry and assembly process rather than on one universal installation rule.
Custom Pogo Pin installation structures
Standard Pogo Pins can meet many PCB connection requirements, but non-standard equipment often has fixed mechanical dimensions before the connector is selected.
In this situation, the connector can be designed around customer drawings.
The Pogo Pin length, mounting tail, working height, contact pitch and installation direction can be adjusted according to the PCB and enclosure structure. Connector housings, locating blocks and mounting components can also be produced to keep the contacts in the required position.
This approach is useful when an existing assembly cannot accommodate a standard connector.
For packaging machinery and automation equipment, drawing-based manufacturing can also be used for the precision mechanical parts surrounding the electrical interface. Connector mounting blocks, brackets, locating components, sleeves, shafts or other non-standard parts can be machined according to the customer's drawings.
Material, dimensional tolerance and surface treatment can then be specified according to the actual mechanical conditions of the equipment. This makes it possible to integrate the connector into an existing machine structure without redesigning the complete assembly around an off-the-shelf component.
Installation accuracy matters in multi-pin connectors
A single Pogo Pin can tolerate a certain amount of dimensional variation, but errors become more noticeable when many pins are arranged in one connector.
Pitch accuracy determines whether every plunger reaches the correct mating pad.
The housing also needs to keep the pins parallel when axial compression is required.
For connectors combining different pin sizes, power contacts and signal contacts may have different spring forces or working heights. These differences should be considered during mechanical design so that all contacts reach a suitable compression position after mating.
Good installation design therefore starts with the complete connector stack rather than treating each Pogo Pin as an isolated component.
FAQ
1. What is the difference between SMT and through-hole Pogo Pin installation?
An SMT Pogo Pin is soldered directly onto a PCB surface pad, while a through-hole Pogo Pin has a terminal that passes through a PCB hole before soldering. SMT can save board penetration space, while through-hole mounting can provide additional mechanical positioning.
2. When should a right-angle Pogo Pin be used?
A right-angle or bent-tail Pogo Pin is useful when the mating direction does not match the PCB orientation. It allows a side-facing contact to connect to a PCB without requiring the entire board to be repositioned.
3. Does a double-ended Pogo Pin need to be soldered?
Not necessarily. Double-ended Pogo Pins can be held inside a mechanical housing and compressed between two conductive surfaces. This makes them suitable for floating or removable board-to-board connections where direct soldering is undesirable.
4. Can the Pogo Pin mounting structure be customized according to a drawing?
Yes. The mounting tail, overall length, working height, pin spacing and surrounding locating structure can be designed according to customer drawings or 3D models. Related non-standard precision parts for packaging machinery and automation equipment can also be machined to drawing when standard mounting components cannot meet the required dimensions or assembly conditions.
