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Electronics SMT PCB SMD Assembly Components 12 Layer OEM

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Electronics SMT PCB SMD Assembly Components 12 Layer OEM

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Electronics SMT PCB SMD Assembly Components 12 Layer OEM

12 Layer Industrial Control SMT PCB Assembly

♦ What Is Electronics PCB Components Assembly?

Electronics PCB Components Assembly (also called PCBA – Printed Circuit Board Assembly) is the process of mounting and soldering electronic components onto a bare PCB to create a functional circuit board. This process transforms a blank PCB into a working electronic device, such as a smartphone, computer, or IoT gadget.

♦ Key Stages of PCB Components Assembly:

1. Component Selection & Procurement

- Passive Components (resistors, capacitors, inductors)
- Active Components (ICs, transistors, diodes)
- Electromechanical Parts (connectors, switches, relays)

2. PCB Assembly Methods

There are two primary assembly techniques:

A. Surface-Mount Technology (SMT) Assembly

- Components are placed directly onto PCB pads.
- Process Steps:
  1. Solder Paste Application (using a stencil)
  2. Pick-and-Place Machine (automated component placement)
  3. Reflow Soldering (melts solder paste in an oven)
- Best for: High-density, compact designs (e.g., smartphones, laptops).

B. Through-Hole Technology (THT) Assembly

- Components have leads inserted into drilled holes.
- Process Steps:
  1. Manual/Automated Insertion of components
  2. Wave Soldering (solder flows over the board)
- Best for: High-power, durable applications (e.g., industrial equipment, automotive).

C. Mixed Assembly (SMT + THT)

- Combines both methods for complex designs.

3. PCB Assembly Process Flow

Step	Description
1. Solder Paste Printing	A stencil applies solder paste to PCB pads.
2. Component Placement	Pick-and-place machines position SMD components.
3. Reflow Soldering	Heats PCB to melt solder and form connections.
4. Through-Hole Insertion	THT components are manually/machine-inserted.
5. Wave Soldering (THT)	Solder bonds THT components to the board.
6. Inspection & Testing	AOI (Automated Optical Inspection), X-ray (for BGAs), functional testing.
7. Conformal Coating (Optional)	Protects PCB from moisture, dust, and corrosion.

DQS Electronic Group is one of the leading EMS company in China, we provide PCB design, PCB manufacturing, PCB assembly service and testing. Welcome send us your Gerber file to get free quotation. Our email: sales@dqspcba.com

♦ Technical Parameters

PCB Assembly Capability
Item				Normal	Special
SMT Assembly	PCB(used for SMT) specification	Length and Width( L* W)	Minimum	L≥3mm, W≥3mm	L＜2mm
		Length and Width( L* W)	Maximum	L≤800mm, W≤460mm	L ＞ 1200mm, W＞500mm
		Thickness( T)	Thinnest	0.2mm	T＜0.1mm
		Thickness( T)	Thickest	4 mm	T＞4.5mm
	SMT components specification	Outline Dimension	Min size	0201(0.6mm*0.3mm)	01005(0.3mm*0.2mm)
			Max size	200 * 125	200 * 125
			component thickness	T≤15mm	6.5mm＜T≤15mm
		QFP,SOP,SOJ (multi pins)	Min pin space	0.4mm	0.3mm≤Pitch＜0.4mm
		CSP/ BGA	Min ball space	0.5mm	0.3mm≤Pitch＜0.5mm
DIP Assembly	PCB specification	Length and Width( L* W)	Minimum	L≥50mm, W≥30mm	L＜50mm
		Length and Width( L* W)	Maximum	L≤1200mm, W≤450mm	L≥1200mm, W≥500mm
		Thickness( T)	Thinnest	0.8mm	T＜0.8mm
		Thickness( T)	Thickest	3.5mm	T＞2mm

♦ Application Fields


PCBA Prototype	Industrial Control PCBA	Telecom PCBA	Medical PCBA

Automotive PCBA	Consumer Electronic PCBA	LED PCBA	Security PCBA

♦ Advantages of DQS Team

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

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Electronics SMT PCB SMD Assembly Components 12 Layer OEM

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