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SMT Assembly Service

2020-05-08

♦ What is SMT Assembly?

SMT Assembly (Surface Mount Technology Assembly) is a modern method of assembling electronic circuits where components are mounted directly onto the surface of a printed circuit board (PCB) rather than through holes, as in traditional through-hole technology (THT).

♦ Features of SMT Assembly

Surface-Mounted Components (SMDs) – Small, flat components (resistors, capacitors, ICs) with no leads or short leads.
Automated Process – Uses pick-and-place machines for high-speed, precise component placement.
Reflow Soldering – Components are soldered using a reflow oven, where solder paste melts and forms connections.
High-Density PCBs – Allows for smaller, lighter, and more compact circuit designs.
Faster & Cost-Effective – More efficient than through-hole assembly for mass production.

♦ SMT Assembly Process Steps

Solder Paste Application – A stencil deposits solder paste on PCB pads.
Component Placement – A pick-and-place machine positions SMDs on the PCB.
Reflow Soldering – The PCB passes through an oven, melting the solder paste to form connections.
Inspection & Testing – Automated optical inspection (AOI) and functional testing ensure quality.

♦ Advantages of SMT Assembly

✔ Smaller, lighter PCBs
✔ Higher component density
✔ Faster production & lower costs
✔ Better performance for high-frequency circuits

♦ Core Competencies of DQS PCB Assembly

SMT		DIP
13 automatic high-speed SMT line 5 million points / day FPC/Double sided mounted Automatic conformal coating		4 DIP line Post-soldering700,000 points/day Professional DIP plug-in team
	SMT Technology		PCBA OEM
	Min package: 01005 Min pin: 0.3mm Min BGA pitch: 0.3 mm		Full turnkey PCB assembly Partial turnkey PCB assembly

♦ Technical Parameters

Item	Spec
Layers	1~64
Board Thickness	0.1mm-10 mm
Material	FR-4, CEM-1/CEM-3, PI, High Tg, Rogers, PTEF, Alu/Cu Base,Ceramic, etc
Max Panel Size	800mm×1200mm
Min Hole Size	0.075mm
Min Line Width/Space	Standard: 3mil(0.075mm) Advance: 2mil
Board Outline Tolerance	士0.10mm
Insulation Layer Thickness	0.075mm--5.00mm
Out Layer Copper Thickness	18um--350um
Drilling Hole (Mechanical)	17um--175um
Finish Hole (Mechanical)	17um--175um
Diameter Tolerance (Mechanical)	0.05mm
Registration (Mechanical)	0.075mm
Aspect Ratio	17:01
Solder Mask Type	LPI
SMT Min. Solder Mask Width	0.075mm
Min. Solder Mask Clearance	0.05mm
Plug Hole Diameter	0.25mm--0.60mm
Impedance Control Tolerance	士10%
Surface finish	ENIG, Immersion Gold, OSP, HASL, Chem. Tin/Sn, Flash Gold, etc
Solder mask	Green/Yellow/Black/White/Red/Blue
Silkscreen	Red/Yellow/Black/White
Certificate	UL, ISO 9001, ISO14001, ISO13485, IATF16949
Special Request	Blind hole, Gold finger, BGA, Carbon ink, peelable mask, VIP process, Edge plating, Half holes, etc
Material Suppliers	Shengyi, ITEQ, Taiyo, etc.
Common Package	Vacuum+Carton

♦ 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

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Rigid Flex PCB

High TG PCB

High Frequency PCB

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PCB Assembly

SMT Assembly

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Box Build Assembly

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Medical PCBA

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PCB Component Sourcing

PCB Manufacturing

PCB Prototype

HDI PCB

Flexible PCB

Rigid Flex PCB

High TG PCB

High Frequency PCB

Aluminum PCB

Thick Copper PCB

Ceramic PCB

PCB Assembly

SMT Assembly

BGA Assembly

Through Hole Assembly

Box Build Assembly

Prototype PCB Assembly

Industrial PCBA

Telecom PCB Assembly

Medical PCBA

Automotive PCBA

Electronic PCBA

Lighting PCB Assembly

PCB Component Sourcing

SMT Assembly Service

SMT Assembly Service