SMT Assembly
SMT PCB Assembly Manufacturing
PCBAndAssembly specializes in Printed Circuit Board Assembly (PCBA) using Surface Mount Technology (SMT) for precision and efficiency. SMT places compact components directly on the PCB, reducing size and weight while improving performance. With advanced technology and expertise, PCBAndAssembly delivers high-quality, reliable PCB assemblies tailored to your needs .
Different Types of Surface Mount Technology (SMT)
Here are three main types of SMT assemblies, categorized based on the placement of components and the use of Through-Hole Technology (THT).
| SMT Type | Description |
| Type I (Pure SMT) | Only contains Surface-Mount Devices (SMDs), mounted on one or both sides of the PCB. No THT components are used. |
| Type II (Hybrid SMT & THT) | A combination of SMT and THT components. The primary side has active SMT components and Dual In-line Packages (DIPs), while the secondary side typically has passive SMT chips. This is the most common type but requires multiple soldering processes (e.g., reflow and wave soldering). |
| Type III (Mainly THT with Passive SMT) | Similar to Type II, but the primary side mainly contains THT components (such as DIPs), while the secondary side has only passive SMT components. This is less common today due to the increasing use of full-SMT designs. |
The SMT Manufacturing Process
The primary steps in the SMT manufacturing process include:
1. Solder Paste Printing
A solder paste printer applies paste to PCB pads using a metal stencil. The stencil aligns precisely with solder pad locations, ensuring accurate paste application.
2. Component Placement
A pick-and-place machine precisely places SMT components onto the solder paste-covered pads using X-Y coordinates from the PCB layout. This process is crucial for using ICT to ensure PCB quality, detecting any placement errors early in the production cycle.
3. Reflow Soldering
The board passes through a reflow oven to melt the solder and secure the components. This step is vital for the long-term reliability of the board, particularly in high density interconnect PCBs that have numerous components.
4. Inspection
Methods like AOI, X-ray, and visual inspection detect defects. Faulty boards undergo rework and reinspection.
5. Testing
Functional tests such as flying probe, bed of nails, and solderability testing ensure the PCB assembly meets performance requirements.
What is the Cost of SMT PCB Assembly?
| Quantity: 5 | 50 cm² | 100 cm² | 200 cm² | 400 cm² | 600 cm² |
| 1-Layer | $17 | $21 | $26 | $36 | $46 |
| 10-Layer | $259 | $279 | $308 | $359 | $412 |
Your final cost will depend on how many PCB you need. Request a free online pcb quote for your project now.
SMT PCB Assembly Lead Time
| Number of Layers | Number of Days |
| 1-12 layers | within 72 hours |
| 12+ layers | within 120 hours |
Lead time may extend depending on the quantity of PCB orders. Contact us today for a free quote to get an accurate estimation of the lead time you can expect.