2 Layers PCB

7.8 mm Ultra-Thick Counterboring Double Side Immersion Gold 1u PCB

Built as a 2-layer stack on FR4 TG135, this board leaves the line at 7.8 mm thickness under ENIG 1u over green solder mask and white legend. The demanding part of this build is Ultra-Thick & Counterboring processing, copper geometry held to 5.0 mil line width and 5.0 mil spacing, mechanical holes from 0.8 mm. The board is signed off to IPC-A-610 E Class II on outline by Rout / V-cut / Bridge / Stamp Hole and thickness to ±10%. Typical end use is electronic device.

  • Layers2 Layers (Max 64 Layers)
  • Base materialFR4 TG135
  • Finished thickness7.8 mm (Max 8mm)
  • Surface finishENIG 1u
  • Min. line width / spacing5.0 mil (Min 2mil) / 5.0 mil (Min 2mil)
  • Special processesUltra-Thick & Counterboring

Quotation within 6 hours. Gerber, PowerPCB, CAD, AutoCAD, OrCAD, P-CAD, CAM-350 and CAM2000 files accepted.

What matters on this build

Ultra-Thick & Counterboring

Ultra-Thick & Counterboring runs on our own lines alongside POFV, backdrill, edge plating, plated half holes and step gold finger — no second supplier.

2-layer construction, scalable to 64 layers

This part is 2-layer; the same presses run 1 to 64 layers, so a stack-up revision does not force a supplier change.

FR4 TG135 laminate

Built on FR4 TG135 — FR4 — drawn from over 120 laminate types held in the warehouse, from KB and ITEQ through Rogers, Isola and Panasonic.

5.0 mil / 5.0 mil line width and spacing

Etched to 5.0 mil width and 5.0 mil spacing here; the process floor is 2/2 mil inner at 1/3 oz copper, with ±10% accuracy on impedance layers.

ENIG 1u surface finish

Finished with ENIG 1u. ENIG 1–3 μin, ENEPIG, hard gold to 3.0 μm, immersion silver, immersion tin, OSP and lead-free HASL are all in-house.

Full specification as manufactured

These are the parameters this part was quoted, tooled and shipped against.

ParameterValue
PCB TypeDouble Side PCB
Number of Layers2 Layers (Max 64 Layers)
Finished Thickness7.8 mm (Max 8mm)
Base MaterialFR4 TG135
Copper Thickness1oz
Min. Mechanical Hole0.8 mm (Min 0.1mm)
Min. Line Width5.0 mil (Min 2mil)
Min. Line Spacing5.0 mil (Min 2mil)
Surface FinishingENIG 1u
Solder MaskGreen
Silk ScreenWhite
Thickness Tolerance±10%
Impedance Control Accuracy±10% (min±5%)
Testing Service100% AOI ICT FCT Testing
Special ProcessesUltra-Thick & Counterboring
PCB StandardIPC-A-610 E Class II
Brand NamePEAK PCB
Place of OriginShenzhen, Guangdong, China
Packaging InnerVacuum Packing/ Anti-Static Package
Packaging OuterExport Carton/ Customizable
PortShenzhen,Hongkong
Supply AbilitySample and Mass Production
Finished Inner Copper ThicknessHoz (Max 14oz)
Finished Outer Copper Thickness1oz (Max 14oz)
Outline ProfileRout/ V-cut/ Bridge/ Stamp Hole
ApplicationElectronic Device
Acceptable File FormatGerber file, Powerpcb, CAD, AUTOCAD, ORCAD, P-CAD, CAM-350, CAM2000

Questions engineers ask about this board

Can this design be scaled beyond 2 layers?

Yes. This part is quoted at 2 layers and the plant fabricates 1 to 64 layers, including sequential-lamination HDI up to 5+N(N+M)+5.

Can a different laminate be substituted for FR4 TG135?

It can. FR4 TG135 is what this part is built on, but material is a design input — Rogers, Arlon, Taconic, Isola, Nelco, Panasonic, TUC, ITEQ, SYTech, Ventec and KB grades are all stocked, and customer-supplied stock is accepted.

Is ENIG 1u the only surface finish offered on this board?

No. ENIG 1u is specified here; ENIG at 1–3 μin gold, ENEPIG, hard gold to 3.0 μm, immersion silver, immersion tin, OSP and lead-free HASL are alternatives, subject to panel size limits on HASL.

What files do you need to quote this part?

Gerber RS-274X plus a drill file and a stack-up or impedance note. PowerPCB, CAD, AutoCAD, OrCAD, P-CAD, CAM-350 and CAM2000 formats are also accepted. Quotation normally comes back within 6 hours.

Other builds in 2 Layers PCB

Get this board quoted

Send the part number or your own Gerber set. An engineer replies with price, lead time and any DFM comments — usually inside 6 hours.