4 Layer Flexible PCB Production Record #FPC-20250917-0076
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| PCB Type | Flexible PCB | Quantity | 30 pcs |
| Layers | 4 Layers | Board Type | Single PCB |
| Dimensions | 138.2 x 75 mm | Copper Weight | 1/2OZ |
| Thickness | 0.23 mm | Min Track / Spacing | 3/3mil |
| Surface Finish | ENIG (Immersion Gold) | Min Hole Size | 0.2mm |
| Solder Mask | Yellow | Silkscreen | White |
| Material | Rolled Copper | Stiffener | PI Stiffener |
This 4-layer flexible PCB measured 138.2 × 75 mm with a finished thickness of 0.23 mm and used rolled copper at ½ oz weight. Produced as single boards for a quantity of 30 pieces, the design featured tight 3/3 mil line/space geometry, 0.2 mm minimum holes, yellow coverlay, white silkscreen, and ENIG surface finish. A PI stiffener was applied, bringing the combined FPC + PI thickness to 0.31 mm.
DFM coordination confirmed the stackup tolerances of ±0.05 mm for both the flex core and the stiffened region. Silkscreen frames overlapping pads were removed to avoid interference with soldering. Gold finger areas were extended by 0.1 mm so the coverlay could fully secure the edges and reduce the risk of finger peeling during handling and assembly. These adjustments preserved the mechanical integrity of the thin flexible construction.
The revised coverlay registration and finger extension were implemented prior to production. Consistent ENIG plating and precise thickness control across the 4-layer flex structure were achieved, ensuring reliable flexibility and interconnection. The order was completed with full dimensional and electrical verification, delivering boards that met the specified thin-flex and stiffener requirements.
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.
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.
| Order ID | PCB Type | Layers | Dimensions | Solder Mask | Surface Finish | Quantity | Action |
|---|---|---|---|---|---|---|---|
| FPC-20260707-032 | Flexible PCB | 4 | 157.2 x 38.6 | Yellow | ENIG (Immersion Gold) | 125 | View detail |
| FPC-20260526-023 | Flexible PCB | 4 | 50 x 75 | Black | ENIG (Immersion Gold) | 5 | View detail |
| FPC-20260516-042 | Flexible PCB | 3 | 76.2 x 457.2 | Yellow | ENIG (Immersion Gold) | 5 | View detail |
