What interests you most about this topic?
What is SMD
What is SMD used for
How does SMD assembly work
What is the difference between SMD and THT
Short & simple explanation:
SMD stands for “surface-mounted device” and refers to electronic components that are mounted directly onto the surface of a printed circuit board (PCB).
What is SMD?
SMD stands for “Surface Mounted Device.” These components do not have wire connections as in THT technology, but are soldered directly onto the surface of the circuit board. This makes them smaller, lighter, and suitable for automated processing. SMD technology enables dense and space-saving assemblies.
What are SMDs used for?
SMD components are now standard in electronics and can be found in almost all devices:
- Smartphones, tablets, and wearables
- Computers and consumer electronics
- Automotive electronics and control units
- Medical devices and measuring systems
- Industrial equipment and IoT applications
SMD technology enables the manufacture of compact, lightweight, and powerful electronic systems.
How does SMD assembly work?
- Preparation: First, solder paste is applied to the circuit board using a stencil, precisely where the components are to be placed later.
- Assembly: Using an automatic assembly machine (pick-and-place machine), the SMD components are placed precisely on the solder paste.
- Soldering: After assembly, the circuit board is placed in an oven (reflow oven). There, the solder paste is heated, melts, and ensures that the components are firmly attached to the circuit board.
- Inspection: After soldering, the circuit board is cooled and then checked to ensure that all components are correctly positioned and that the solder joints are in order.
What is the difference between THT and SMD?
- THT (Through Hole Technology) uses components with wire connections that are inserted through holes drilled in the circuit board and soldered on the back.
- SMD components, on the other hand, are soldered directly onto the surface of the board and do not require any holes to be drilled.
The most important differences:
| SMD | THT | |
| Type of installation | Components are soldered directly onto the surface of the printed circuit board (PCB). They are small and have no wires that are inserted through the board. | Components have wires or legs that are inserted through holes in the circuit board and soldered on the back. They are well suited for mechanically resilient connections (e.g., plugs, buttons). |
| Size | Generally smaller and more compact, which saves space and enables the miniaturization of circuits. | Larger, as the wires and the design require more space. |
| Assembly process | This is usually automated by machines, e.g., pick-and-place machines, which speeds up production. | Often assembled manually or using less automated processes. |
| Use | Frequently used in modern, compact electronic devices. | Still used in some applications, especially where high mechanical stability, high current flow, or easy repair is required. |
| Repair and prototyping | Requires special tools and experience, but is common in modern devices. | Easier to handle and repair, especially for beginners or when working with prototypes. |
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