The PCB terminal refers to the terminal used in the electrical connection of the PCB circuit board, and is an electronic accessory product used to realize the electrical connection.
PCB terminal blocks are classified into pluggable terminal blocks, screw terminal blocks, spring terminal blocks, and barrier terminal blocks.
1. Pluggable terminal block
Plug-in terminal products have pin pitches of 3.5, 3.81, 5.0, 5.08, 7.5, 7.62 poles and 2-24 lines, which can be matched with PCB sockets with screws. The terminal plugs use side connection technology, which is characterized by screws The direction is perpendicular to the incoming direction of the wire.
2. Screw terminal
It is one of the mainstream printed circuit board terminal technology. It has the advantages of compact structure, reliable connection, strong and reliable housing, and precise stitch pitch, which can ensure reliable PCB wiring and large capacity. The welding foot and the clamping body are divided into two parts to ensure that the welding point will not be touched and damaged when the screw is tightened.
3. Spring type terminal
Spring-loaded terminal blocks provide 2.54mm, 3.50mm, 5.00mm, 7.50mm, 7.62mm and equal spacing. PCB single-core wires can be inserted directly without assistance. There is no button specification, and the wires can be easily taken out during the unwinding process. Spring-type terminal blocks are often used in communication systems, lighting systems and monitoring systems. There are various wiring directions, suitable for high-density wiring needs.
4. Barrier terminal block
The code of the fence type terminal is LW, the middle pin code is C, the side pin code is B, the fixed code is M, the curved pin code is R, and the welding type code is Q. It has a simple structure, and the board crimping is intuitive and firm. And other advantages, the wire diameter ranges from 0.5mm to 6mm.
How to identify the quality of PCB terminal blocks:
1. The difference in appearance: there are one or more iron die-casting lines on the appearance of the terminal block, which is a protruding line
2. The difference in weight: copper is heavier than zinc in the terminal
3. The difference in color: After the electroplated layer on the surface of the terminal is cut, the golden yellow color that appears is copper, and the white one is zinc.
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