SMT DIP THT Quick Turnaround Pcb Assembly Oem Circuit Boards For Medical Equipment
High Quailty PCB Board Assembly(SMT/DIP/THT) for Medical Equipment
♦ What is PCB Board Assembly?
PCB Board Assembly (PCBA) is the process of mounting and soldering electronic components onto a bare Printed Circuit Board (PCB) to create a functional electronic device. It transforms an empty PCB into a working circuit by attaching components like resistors, capacitors, ICs, and connectors.
♦ Key Stages of PCB Assembly
1. Solder Paste Application
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- A stencil aligns with the PCB, and solder paste (a mix of tiny solder particles and flux) is applied to pads where components will be placed.
2. Component Placement
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- Surface Mount Technology (SMT): Automated pick-and-place machines accurately position tiny SMD components (e.g., resistors, ICs) onto the solder paste.
- Through-Hole Technology (THT): Larger components (e.g., connectors, transformers) are manually or automatically inserted into drilled holes.
3. Soldering
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- Reflow Soldering (for SMT): The PCB passes through a reflow oven, melting the solder paste to form strong electrical connections.
- Wave Soldering (for THT): The board moves over a wave of molten solder to bond through-hole components.
4. Inspection & Testing
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- Automated Optical Inspection (AOI): Cameras check for missing/misaligned parts or soldering defects.
- In-Circuit Testing (ICT): Electrical probes verify circuit functionality.
- Functional Testing: The assembled PCB is powered on to ensure it works as designed.
5. Conformal Coating (Optional)
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- A protective coating (e.g., silicone, acrylic) may be applied to shield against moisture, dust, and corrosion.
♦ Types of PCBA Services
| Type | Description | Best For |
|---|---|---|
| Turnkey PCBA | Full service—supplier handles PCB fabrication, component sourcing, assembly, and testing. | Startups, companies wanting hassle-free production. |
| Consigned PCBA | Customer provides components; assembler only does placement/soldering. | Cost-sensitive projects with existing parts inventory. |
| Partial Turnkey | Hybrid approach—some parts supplied by customer, others by the assembler. | Customized builds with specialty components. |
♦ DQS's PCB Assembly Capability
|
Item |
Normal |
Special |
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|
SMT Assembly |
PCB(used for SMT) specification |
Length and Width( L* W) |
Minimum |
L≥3mm, W≥3mm |
L＜2mm |
|
Maximum |
L≤800mm, W≤460mm |
L ＞ 1200mm, W＞500mm |
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|
Thickness( T) |
Thinnest |
0.2mm |
T＜0.1mm |
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|
Thickest |
4 mm |
T＞4.5mm |
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|
SMT components specification |
Outline Dimension |
Min size |
0201(0.6mm*0.3mm) |
01005(0.3mm*0.2mm) |
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|
Max size |
200 * 125 |
200 * 125 |
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|
component thickness |
T≤15mm |
6.5mm＜T≤15mm |
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|
QFP,SOP,SOJ (multi pins) |
Min pin space |
0.4mm |
0.3mm≤Pitch＜0.4mm |
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|
CSP/ BGA |
Min ball space |
0.5mm |
0.3mm≤Pitch＜0.5mm |
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|
DIP Assembly |
PCB specification |
Length and Width( L* W) |
Minimum |
L≥50mm, W≥30mm |
L＜50mm |
|
Maximum |
L≤1200mm, W≤450mm |
L≥1200mm, W≥500mm |
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|
Thickness( T) |
Thinnest |
0.8mm |
T＜0.8mm |
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|
Thickest |
3.5mm |
T＞2mm |
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♦ One-Stop Electronic Manufacturing Including
|
PCB Prototype |
Quick Turn PCB |
Single-Sided PCB |
Double-Sided PCB |
Multilayer PCB |
Rigid PCB |
|
Flexible PCB |
Rigid-Flex PCB | Rigid-Flex PCB | Aluminum PCB | Metal Core PCB |
Thick Copper PCB |
|
HDI PCB |
BGA PCB | High TG PCB | PCB Stencil | Impedance Control PCB |
PCB Assembly |
| High-Frequency PCB | Bluetooth Circuit Board | Automotive PCB | USB Circuit Board | Halogen-Free PCB |
Antenna PCB |
♦ Core Competencies of DQS PCB Assembly
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