SUB PCB

SYTech Sl643HU 4 Layers 0.4mm Thickness Hoz ENEPIG FCBGA Substrate PCB

A 4-layer Substrate PCB built on SYTech Sl643HU, profiled to 0.4 mm finished thickness and plated with ENEPIG over green solder mask. The process window is set by copper geometry held to 50 μm line width and 50 μm spacing, mechanical holes from 100 μm, finished copper at ½ oz / ½ oz. Nothing leaves without 100% AOI, ICT and FCT testing; IPC-A-610 E Class III governs workmanship and outline by Rout / V-cut / Bridge / Stamp Hole is logged. It is specified for electronic device builds.

  • Layers4 Layers (Max 64 Layers)
  • Base materialSYTech Sl643HU
  • Finished thickness0.4 mm (Max 8mm)
  • Surface finishENEPIG
  • Min. line width / spacing50um / 50um

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

What matters on this build

4-layer construction, scalable to 64 layers

This part is 4-layer; the same presses run 1 to 64 layers, so a stack-up revision does not force a supplier change.

SYTech Sl643HU laminate

Built on SYTech Sl643HU — engineered laminate — drawn from over 120 laminate types held in the warehouse, from KB and ITEQ through Rogers, Isola and Panasonic.

50 μm / 50 μm line width and spacing

Etched to 50 μm width and 50 μm spacing here; the process floor is 2/2 mil inner at 1/3 oz copper, with ±10% accuracy on impedance layers.

ENEPIG surface finish

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

Hole sizes from 100 μm mechanical

Drilling covers 0.15 mm mechanical and 0.076 mm laser holes, backdrill to ±0.1 mm and depth control to 0.05 mm.

Full specification as manufactured

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

ParameterValue
PCB TypeSubstrate PCB
Number of Layers4 Layers (Max 64 Layers)
Finished Thickness0.4 mm (Max 8mm)
Base MaterialSYTech Sl643HU
Copper ThicknessHoz
Min. Hole100um
Min. Line Width50um
Min. Line Spacing50um
Surface FinishingENEPIG
Solder MaskGreen
Silk ScreenNo
Thickness Tolerance±5%
Impedance Control Accuracy±10% (min±5%)
Testing Service100% AOI ICT FCT Testing
Special ProcessesNo
PCB StandardIPC-A-610 E Class III
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 Thickness0oz (Max 14oz)
Finished Outer Copper ThicknessHoz (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 4 layers?

Yes. This part is quoted at 4 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 SYTech Sl643HU?

It can. SYTech Sl643HU 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 ENEPIG the only surface finish offered on this board?

No. ENEPIG 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 SUB 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.