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PCB Train
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PCB Train Single & Double sided PTH 4 & 6 Layers
Laminate thickness & type 1.6 mm FR4,
0.8 mm FR4
1.6 mm FR4
1 oz Cu thickness, outers (start thickness before plating) 18 microns 18 microns
1 oz Cu thickness, outers (finish thickness after plating) 35 microns 35 microns
2 oz Cu thickness, outers (start thickness before plating) 70 microns n/a
2 oz Cu thickness, outers (finish thickness after plating) 87 microns n/a
Copper thickness (inner-cores), start = finish thickness n/a 35 microns
Solder resists (photo-image) Green x 2 Green x 2
Legend White x 2 White x 2
Nos. of holes No limit No limit
Min finished size of holes after Cu plate 0.20 mm 0.20 mm
Profile complexity No limit No limit
Surface Finish Immersion Silver (optionally Au/Ni on some services)
Immersion Silver (optionally Au/Ni on some services)
Gold (electrolytic) n/a n/a
Electrical test Included Included
Min track & gap (35 micron / 1oz Cu thickness) 0.125mm 0.125 mm
Min track & gap (70 micron / 2oz Cu thickness) 0.250mm n/a
Solder resist to copper pad clearance 0.125mm 0.125 mm
Copper pad to hole 0.125mm 0.125 mm
Copper track to copper plane clearance within a ground plane 0.125mm 0.125 mm
Minimum board size 10 mm x 10 mm 10 mm x 10 mm
Maximum board size 550 mm x 400 mm 550 mm x 400 mm
Mechanical No scoring.
No chamfering.
No countersinking.
No rebating.
2.0 mm standard router.
No scoring.
No chamfering.
No countersinking.
No rebating.
2.0 mm standard router.

Legend text line width

Legend character height

Legend to copper pad clearance

50 micron minimum, 150 micron typical

0.5 mm minimum

50 micron minimum

50 micron minimum, 150 micron typical

0.5 mm minimum 

50 micron minimum

Drill hole to copper clearance (inner layer) 0.5 mm min. 0.5  mm min.

Mechanical edge to copper track clearance

Profile tolerance

0.25 mm min.

+/- 0.2 mm 

0.25 mm min.

+/- 0.2 mm 

Dielectric constant (Dk) of FR4 cores
Dielectric constant (Dk) of FR4 prepregs
4.55
4.2
4.55
4.2
4 Layer 0.8 mm overall thickness M/L construction "Z" axis spacing of copper layers (4 layers) n/a 1-2  0.22 mm
2-3  0.20 mm
3-4  0.22 mm
4 Layer 1.6 mm overall thickness M/L construction "Z" axis spacing of copper layers (4 layers) n/a 1-2  0.22 mm
2-3  0.99 mm
3-4  0.22 mm
6 Layer 1.6mm overall thickness M/L construction "Z" axis spacing of copper layers (6 layers) n/a 1-2  0.22 mm
2-3  0.30 mm
3-4  0.22 mm
4-5  0.30 mm
5-6  0.22 mm
Overall thickness tolerance + / - 10 % + / - 10 %
If your requirements exceed PCB Train specifications Ask us to quote Ask us to quote