2 Layer Flexible PCB Assembly for LED
♦ What is Flexible PCB Assembly?
Flexible PCB Assembly (Flex PCBA) is the process of mounting and soldering electronic components onto a flexible printed circuit board (Flex PCB)—a bendable, lightweight alternative to traditional rigid PCBs. These assemblies are used in applications where flexibility, space savings, or dynamic movement is required.
✔ Bendable & Lightweight – Can be folded, twisted, or shaped to fit tight spaces.
✔ High-Density Interconnects – Supports complex circuitry in compact designs.
✔ Durability – Resists vibration, shock, and mechanical stress better than rigid PCBs.
✔ Thin & Light – Ideal for wearable tech, medical devices, and aerospace.
♦ Flexible PCB Assembly Process?
1. Flex PCB Fabrication
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- Made from polyimide (PI) or PET materials (instead of rigid FR4).
- Layers include:
- Conductive traces (copper)
- Adhesive layers
- Coverlay (protective film, like solder mask)
2. Solder Paste Application (SMT for Flex PCBs)
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- A laser-cut stencil applies solder paste to flexible PCB pads.
- Challenges:
- Flex PCBs are thin and may warp during soldering.
- Requires precise temperature control.
3. Component Placement
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- Pick-and-place machines mount SMD components (resistors, ICs, etc.).
- Critical:
- Avoid placing large components near bend areas.
- Use stiffeners (rigid supports) where needed.
4. Reflow Soldering
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- Lower peak temperatures (~230–250°C) than rigid PCBs to avoid damaging polyimide.
- Controlled heating/cooling prevents warping.
5. Through-Hole Assembly (If Needed)
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- Flex-rigid PCBs may have plated through-holes (PTH).
- Manual soldering is often required for THT parts.
6. Inspection & Testing
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- Automated Optical Inspection (AOI) – Checks for misalignment or solder defects.
- X-ray Inspection (AXI) – Examines hidden joints (e.g., under BGAs).
- Flex Testing – Verifies durability under bending/stretching.
♦ Types of Flexible PCB Assemblies?
| Type | Description | Applications |
| Single-Sided Flex PCBA | Components on one side. | Simple wearables, sensors. |
| Double-Sided Flex PCBA | Components on both sides. | Cameras, medical devices. |
| Multilayer Flex PCBA | 3+ conductive layers. | High-speed electronics (5G, aerospace). |
| Rigid-Flex PCBA | Combines rigid and flex sections. | Foldable phones, military systems. |
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 |
| Maximum | L≤800mm, W≤460mm | L ＞ 1200mm, W＞500mm |
| Thickness( T) | Thinnest | 0.2mm | T＜0.1mm |
| 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 |
| Maximum | L≤1200mm, W≤450mm | L≥1200mm, W≥500mm |
| Thickness( T) | Thinnest | 0.8mm | T＜0.8mm |
| Thickest | 3.5mm | T＞2mm |
♦ Application Fields
♦ Advantages of DQS Team
- On-time Delivery:
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- Owned PCBA factories 15,000 ㎡
- 13 fully automatic SMT lines
- 4 DIP assembly lines
2. Quality Guaranteed:
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- IATF, ISO, IPC, UL standards
- Online SPI, AOI, X-Ray Inspection
- The qualified rate of products reach 99.9%
3. Premium Service:
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- 24H reply your inquiry
- Perfect after-sales service system
- From prototype to mass production
Product Tags:
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2 Layer Flexible Multilayer PCB Assembly For digital LED Images
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