4 Layer FR4 PCB Production Record #FR4-20260421-036
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| PCB Type | FR4 PCB | Quantity | 5 pcs |
| Layers | 4 Layers | Board Type | Panel PCB |
| Dimensions | 65.02 x 321.82 mm | Copper Weight | 1oz |
| Thickness | 0.8 mm | Min Track / Spacing | 10/10mil |
| Surface Finish | HASL Lead Free | Min Hole Size | 0.3mm↑ |
| Solder Mask | White | Silkscreen | Yellow |
| Stack-up | Default | Impedance Control | No |
This 4-layer FR-4 board measured 65.02 × 321.82 mm with 1 oz copper on inner and outer layers and a thin finished thickness of 0.8 mm. Produced in a small run of 5 pieces using KB-6165F TG150 material, the design used a standard 10 mil line/space, lead-free HASL surface finish, and included slotted features with 4 mm process edges on top and bottom sides. No impedance control, blind vias, or resin plugging was required, with single-panel mechanical forming and 100% flying probe testing.
DFM review addressed multiple file clarifications including text orientation on L3 and L4 layers, bottom silkscreen SN marking, and confirmation of the authoritative set of documents. The primary engineering concern involved customer-specified countersink hole parameters calling for approximately 0.85 mm depth on a 0.8 mm board, which risked breakthrough and damage to L1/L2 copper layers. Parameters were reconciled and adjusted to safe limits before release, following established countersink depth control on thin boards to protect inner layer integrity while meeting functional requirements. Cycle marking updates were also implemented per the revised order instructions.
Production completed without deviation, delivering boards that met all dimensional, copper, and electrical specifications. The thin panel configuration maintained flatness and registration throughout processing, supporting reliable performance for this low-volume order.
Standard multilayer solution offering practical routing density and controlled impedance for industrial and consumer electronics.
In-depth guide to the most frequent Engineering Queries (EQ) and DFM issues in Multilayer FR4 PCB (4/6/8+ layers) production. Real factory insights on stack-up confirmation, impedance control, copper balance, inner layer design, via treatment, registration, and practical prevention strategies.
| Order ID | PCB Type | Layers | Dimensions | Solder Mask | Surface Finish | Quantity | Action |
|---|---|---|---|---|---|---|---|
| FR4-20260628-010 | FR4 PCB | 2 | 60 x 120 | Green | HASL Lead Free | 5 | View detail |
| FR4-20260619-010 | FR4 PCB | 2 | 121 x 121 | Green | HASL Lead Free | 50 | View detail |
| FR4-20260618-018 | FR4 PCB | 2 | 54.74 x 106.93 | Green | HASL Lead Free | 5 | View detail |
