What is SMD (Surface Mount Device)? Everything about surface-mounted components: package types, advantages, SMD vs. THT and the manufacturing process.
What is SMD?
SMD stands for Surface Mount Device – components that are soldered directly onto the surface of the circuit board without through-holes. SMD technology enables smaller assemblies, higher packing densities, and fully automated high-speed placement. Today, over 90% of all electronic components are SMD.
Advantages of SMD Technology
- Compact size: SMD components are significantly smaller than THT
- Double-sided assembly: Both sides of the PCB can be used
- Automation: High-speed placement with pick & place (up to 50,000 components/hour)
- Better RF properties: Shorter leads = less parasitic inductance
- Lower costs: Automated manufacturing reduces unit costs in series production
Common SMD Package Sizes
Standard SMD packages range from tiny 01005 (0.4×0.2mm) for wearables to 2512 (6.3×3.2mm) for high-current resistors. For prototypes, 0402 or larger is recommended.
SMD vs. THT Comparison
SMD offers smaller size, automatic placement, and lower series costs. THT provides better mechanical strength and heat dissipation. Most modern assemblies combine both technologies.
The SMD Manufacturing Process
The standard SMD process: solder paste application via stencil, SPI inspection, pick & place component placement, reflow soldering, and 3D-AOI inspection. At professional EMS providers, every step follows the highest quality standards.
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