2.54mm PCB Pluggable Terminal Block Male Header

2.54mm PCB Pluggable Terminal Block Male Header (Straight Pin)

As the name suggests, a straight pin refers to the pin part connected to the PCB board that is straight and perpendicular to both the terminal body and the PCB board plane. It is a reliable and widely used connection solution for various electronic components.

Design Structure & Mechanical Characteristics

• Shape & Material: Typically features cylindrical or square pins protruding vertically from the bottom of the insulation body. Integrally formed with economical brass for high strength, excellent conductivity, and high cost-effectiveness.
• Electroplating: To enhance solderability, prevent oxidation, and improve corrosion resistance, the surface of straight pins is typically tin-plated (the most common and cost-effective choice).
• Mechanical Fixation (Crimp/Rivet): The pin tip usually features a barb, knurling, or riveting structure. During injection molding, the plastic tightly wraps around this structure, forming an extremely strong connection that prevents the pin from being pulled out.
• Coplanarity: For multi-position terminal blocks, the bottoms of all straight pins must lie on the same absolute plane. High coplanarity ensures all pins make good contact with PCB pads simultaneously, which is key to achieving high-quality soldering.

Type and Pole

Type: PCB Pluggable Screw Terminal Block

Available Poles:

Technical Specifications

Through-Hole Soldering Process & Joint Analysis

This is the core area where the straight pin terminal forms electrical and mechanical connections with the circuit board.

1. Coordination between pins and pads

• - PCBs are designed with through-hole pads corresponding to the pins.
• - Matching Diameter: The through-hole is usually 0.2-0.4mm larger than the pin (e.g., a 0.64mm pin matches a 0.9-1.0mm hole) to allow space for solder to climb via capillary action.

2. Welding process (Mainly Through-Hole Technology)

• - Wave Soldering: The standard process. Includes Plugin (insertion), Fluxing (removing oxides), Preheating (preventing thermal shock), Soldering (passing over a molten solder wave), and Cooling.
• - Manual Soldering: Suitable for small-batch production, repair, or replacement using a soldering iron.

3. Solder joint morphology and requirements

• - Full filling: Solder should fill 100% of the through-hole and form a small conical meniscus on the bottom.
• - Good contact angle: The contact angle should be smooth and rounded, indicating good wetting.
• - Bright and smooth: The surface should be bright, free of burrs, and without pores.

Advantages & Design Considerations

• Extremely High Mechanical Strength: Through-hole soldering provides significantly higher mechanical strength than SMT. The terminals withstand greater insertion/extraction forces and lateral stress.
• Reliable Connection: Solder forms an all-around connection within the through-hole, offering a large contact area and strong resistance to current impact.
• Easy to Detect and Repair: Solder joints are visible for easy quality inspection. Disassembly is straightforward with basic desoldering tools.
• Cost-Effectiveness: A mature technology with a simple production process that remains highly cost-effective in high-volume runs.
• Design Limitations to Note: Through-holes occupy the entire thickness of the PCB and limit bottom-layer wiring density. Also, high temperatures during wave soldering require high-temperature resistant materials (like UL94 V-0 PA66).

Dimensions

Packaging & Shipping

We choose high-quality and safe packaging materials to make sure your order won't be damaged during delivery. Acceptable trade terms include: EXW, FOB, CFR, CIF.

Application of Pluggable Terminal Block

• Motion controllers & Automation equipment
• Three-phase power meters & Electric equipment
• Microcomputer protection devices
• Security equipment & Internet of Things (IoT) devices

Terminal Block FAQ