One-Stop SMT PCB Manufacturing for Consumer Electronics

♦ What is SMT PCB Manufacturing?

​​SMT (Surface Mount Technology) PCB Manufacturing​​ is the process of assembling printed circuit boards by mounting electronic components directly onto the surface of the PCB using automated machines, as opposed to through-hole technology (THT), where components are inserted into drilled holes.

♦​​ Key Steps in SMT PCB Manufacturing​​

1. PCB Fabrication (Before SMT Assembly)​​

• • The bare PCB is manufactured with solder pads (no holes needed for SMT components).
  • Common materials: FR-4, aluminum, or flexible substrates.

​​2. Solder Paste Application​​

• • ​​Stencil Printing​​: A metal stencil aligns with the PCB, and solder paste (a mix of tiny metal balls and flux) is applied to the pads.

​​3. Component Placement​​

• • ​​Pick-and-Place Machines​​ automatically pick SMDs (Surface Mount Devices) from reels/trays and place them on the solder paste with high precision.
  • Components include resistors, capacitors, ICs (QFN, BGA), and more.

​​4. Reflow Soldering​​

• • The PCB passes through a ​​reflow oven​​, where controlled heating melts the solder paste, forming permanent electrical connections.
  • Temperature profile: Preheat → Soak → Reflow → Cooling.

​​5. Inspection & Testing​​

• • ​​AOI (Automated Optical Inspection)​​ – Checks for misalignment, solder defects.
  • ​​X-Ray Inspection​​ – For hidden joints (e.g., BGA components).
  • ​​Functional Testing​​ – Validates the assembled PCB’s performance.

♦ ​​​​​​SMT vs. Through-Hole (THT) PCB Assembly​​​​​​

 ♦ Technical Parameters

♦ One-Stop PCBs Solution

 

PCB Prototype	Felx PCB	Rigid-Flex PCB	Ceramic PCB
Heavy Copper PCB	HDI PCB	High Frequency PCB	High TG PCB

 

 

 

♦ Advantages of DQS Team

1. On-time Delivery:  

• • Owned PCBA factories 15,000 ㎡
  • 13 fully automatic SMT lines 
  • 4 DIP assembly lines

 

     2. Quality Guaranteed:

• • IATF, ISO, IPC, UL standards 
  • Online SPI, AOI, X-Ray Inspection 
  • The qualified rate of products reach 99.9%

 

     3. Premium Service:

• • 24H reply your inquiry
  • Perfect after-sales service system
  • From prototype to mass production