PCB Specifications
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| PCB Type | Flexible PCB | Quantity | 15 pcs |
| Layers | 4 Layers | Board Type | Single PCB |
| Dimensions | 38.8 x 128.4 mm | Copper Weight | 1OZ |
| Thickness | 0.23 mm | Min Track / Spacing | 3/3mil |
| Surface Finish | ENIG (Immersion Gold) | Min Hole Size | 0.3mm↑ |
| Solder Mask | Black | Silkscreen | White |
| Material | Rolled Copper | Stiffener | FR4 Stiffener |
Manufacturing Timeline
Logistics Information
Key Manufacturing Processes
Manufacturing Summary
For this order of 15 four-layer flex PCBs, production used 0.23 mm thick rolled copper on polyimide, with board dimensions of 38.8 × 128.4 mm. The design incorporated tight 3/3 mil trace spacing, black soldermask, white silkscreen, and selective FR4 stiffeners. These elements required precise FPC material preparation and polyimide handling to preserve flexibility while meeting the fine geometry and multilayer registration demands.
Stackup impedance engineering guided the inner layer imaging, circuit etching, and high-pressure lamination steps. Coverlay lamination was followed by electroless nickel and immersion gold deposition to produce a uniform ENIG finish. We validated the impedance controlled PCB through TDR testing, dynamic flex testing, and 100% electrical testing, confirming all boards met both electrical and mechanical criteria.
Over the 22-day schedule the lot maintained consistent trace profiles, hole quality above 0.3 mm, and layer alignment, delivering reliable flexible circuits suited to applications requiring controlled impedance and repeated bending.
Explore More PCB Manufacturing Resources
4 Layer Flexible PCB Manufacturing Insights
Discover how AIVON manufactures 4 Layer Flexible PCBs, including multilayer flexible circuit structures, layer alignment control, bending performance, manufacturing challenges, and real production experience from customer orders.
Mastering Flexible PCB Manufacturing: Handling Thin and Bendable Substrates
Learn about flexible PCB manufacturing equipment designed for handling thin, bendable substrates. Gain insights into laser cutting, adhesive bonding, and testing methods to ensure precision and reliability in production.
Real Production Records
| Order ID | PCB Type | Layers | Dimensions | Solder Mask | Surface Finish | Quantity | Action |
|---|---|---|---|---|---|---|---|
| FPC-20260821-065 | Flexible PCB | 4 | 111.25 x 16.75 | Yellow | ENIG (Immersion Gold) | 5 | View detail |
| FPC-20260819-026 | Flexible PCB | 4 | 59.8 x 65.5 | Yellow | ENIG (Immersion Gold) | 25 | View detail |
| FPC-20260810-032 | Flexible PCB | 4 | 357 x 45.8 | Black | ENIG (Immersion Gold) | 1000 | View detail |
