Comprehensive Guide to PCB Board Connector Types

A connector list can become confusing when it mixes wire-to-board, coaxial, circular and SMT as though they were competing choices. They describe different things: what connects, what the circuit carries, how the housing is shaped and how the component is attached. A single part can belong to several of those categories at once. This guide keeps the useful families from the original comparison but separates those classification axes, so an engineer can shortlist a connector without overlooking board orientation, a flex-cable interface or the production process. That distinction also makes a supplier quotation easier to compare.

The short answer is to classify PCB board connector types by the interface first: wire-to-board, board-to-board or an external I/O connection. Then add the circuit requirements, such as RF, high-speed data or power, and select a compatible mounting method. TE Connectivity’s PCB connector overview describes multiple product families rather than one universal board interface. The shortlist should identify both mating parts and their drawing revisions. A shared pitch or contact count is not enough to decide that two families can replace each other.

PCB connectors make electrical interfaces separable. The type comparison below starts with the parts being connected and then adds the service and assembly requirements.

Why does the PCB interface matter to assembly and service?

Connectors on printed circuit boards give electronics the ability to function properly as they provide connections between different parts of various electronic systems without having to solder wires directly onto the circuit board. Connectors allow for increased flexibility in terms of assembly, ease-of-maintenance, and scalability of the system, making them ideal for creating durable designs with maximum adaptability to different operating requirements.

Which PCB connector families should be compared?

Various types of connectors have been developed for specific requirements; thus, different types of connectors have different features and advantages unique to each type of connector. This article describes some of the most common types of PCB connectors:

When is a wire-to-board connector needed?

Individual wires/cables can be connected to PCBs easily through the use of Wire-to-Board connectors. When using Wire-to-Board connectors in your application, you will often find they are designed to fit into tighter spaces than standard connectors and provide a secure and durable connection. Examples include:

• Pin Headers
• Terminal Blocks
• IDC Connectors (Insulation-Displacement Connectors)

When should two boards be connected directly?

Board-to-board connectors function as a bridge, connecting different PCBs together electrically even though those boards may be modules themselves. Compact electronic systems (e.g., consumer electronics/industrial equipment) require board-to-board connectors to preserve valuable internal space and maintain high levels of electrical signal repeatability.

What makes a coaxial interface different?

In RF applications, coaxial connectors are utilized for sending RF (radio frequency) signals such as for use with antennas and communication devices. They are shielded to help prevent loss of signal and to reduce interference.

Which connectors provide external I/O ports?

Connection points on input/output (I/O) ports connect to other devices or peripherals connected via printed circuit boards (PCBs). These types of connectors exist in most consumer electronics, computers, or industrial products. However, here are some examples:

• USB Connectors
• HDMI Connectors
• VGA Connectors

When does a circular housing suit the board interface?

A circular housing may be part of a board-mounted external interface. Its shape does not define the circuit function, sealing or vibration capability. Check the selected mating pair, panel or board mounting and the required environmental evidence.

What must a high-speed connector support?

As the popularity of data-heavy applications increases, fast data transfer with minimum interference is possible through high speed connectors, thus making these connectors an excellent fit for industries such as telecommunications and networking.

Which specifications determine whether a PCB connector fits?

When selecting a PCB connector, pay careful attention to the following specifications:

Which design changes require a fresh connector review?

A smaller enclosure, a different cable exit, a higher data rate or a revised current load can change the suitable connector even when the circuit count stays the same. Recheck the complete interface after such changes instead of carrying forward the previous family rating.

• For a smaller board, compare mating access and retention features as well as pitch.
• For a higher data rate, verify the connector, launch, routing and cable as a channel; a USB-C shell does not by itself specify supported speed.
• For a modular assembly, confirm the expected service operation and connector cycle limit.
• For a changed material or finish, request the revised specification and relevant evidence rather than assuming the same durability.

When are two PCB connectors not interchangeable?

Two parts can share a pitch or pin count and still fail to mate or perform safely. Check the housing and contact geometry, gender, keying, contact length, plating, board footprint, mounting orientation, retention and the approved mating part. Also compare the electrical and environmental ratings under the same loading and test conditions.

For procurement, keep the connector drawing, mating-part number, PCB land pattern and assembly instruction together. This prevents a visually similar replacement from entering production without evidence of mechanical, electrical and process compatibility.

Why should interface type, circuit function and mounting be kept separate?

JLCPCB’s PCB connector guide includes SMT, through-hole and press-fit approaches. Press-fit is a distinct option, not a form of soldered through-hole assembly. Where it is selected, obtain the supplier’s finished-hole and insertion-process requirements; do not substitute a conventional plated-hole pattern without checking them.

How does board orientation change a board-to-board connector choice?

Record the mechanical arrangement before choosing the pitch. Harwin distinguishes parallel or mezzanine, right-angle and coplanar board arrangements. A board-to-board label does not specify the resulting stack height or clearance.

What must match when selecting an FFC or FPC connector?

FFC refers to a flat flexible cable and FPC to a flexible printed circuit. These names do not establish one interchangeable termination. Match pitch, circuit count, contact side, flex thickness, exposed-contact length and retention features to the connector drawing. Check whether the latch opens by lifting or sliding and whether the cable needs a stiffener. A same-pitch flex that is too thick or presents its contacts on the wrong side is not an acceptable substitute.

For a high-speed interface, keep the channel evidence separate from physical fit. IEC 60512-1:2018 provides a connector-test framework, but the detail specification selects the tests and limits. A general test-method reference does not replace configuration-specific signal-integrity data.