WELSA CO.,LTD.
Quality PCB, Flex PCB Manufacturing & PCBA Services
Printed Circuit Boards
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Quick turn, Flexible Order Quantity, Reliable High Quality and Good Price.
We provide prototypes to volume production, giving customers the capability to order exactly what they needed.
For more complex technical specifications of the board that you need, please contact us.
Or upload your Gerber and data to us and we will do the rest for you. We are also offering, kitting, component assembly.
Gold fingers 6 layer PCB with black solder mask and purple solder mask
4 Layer blue tooth PCB balck solder mask immersion gold
6L Immersion Gold
18 Layer
4 Layer with peelable solder mask
PCB Fabrication Specification
Files Types:
Gerber files ----- preferred format 274-X, 274-D, DPF, ODB++
Drill file-----X & Y coordinates, with tool sizes included
Maximum finished dimension
23.62" x 15.74" – Single / Double Layer
23.62" x 15.74" – 4 ~12 Layer
Minimum thickness
Single/Double 0.3mm +/-0.1mm (0.012" +/- 0.004" )
4 Layer 0.4mm +/-0.1mm (0.016" +/- 0.004")
6 Layer 0.6mm +/-0.1mm (0.024" +/- 0.004")
8 Layer 0.8mm +/-0.1mm (0.032" +/- 0.004")
10 Layer 1.0mm +/-0.12mm (0.04" +/-0.005")
12 Layer 1.2mm +/- 0.12mm (0.048" +/-0.005")
Maximum thickness
6.0mm +/- 10% (0.236" +/- 10% )
Bow and twist
< 7/1000
Laminate Material
FR-4 、High TG FR-4(170°C/180°C) 、Halogen free
FR-4 Laminate thickness (Standard) 1.6mm (0.062")
High TG FR-4 (170 degree C) 1.6mm (0.062")
Layer Construction
Maximum processed layer count 22 layer
Minimum core thickness 0.08mm (0.003") Standard / 0.05mm (0.002" ) Special
Drilling
Minimum Size Mechanical Drill -0.2mm (0.008") / Laser Drill-0.1mm (0.004")
Maximum Size 6.0mm
True Position Tolerance +/- 0.002" (0.050mm)
Tolerance of PTH +/- 0.003" (0.075mm)
Tolerance of NPTH +/- 0.002" (0.050mm)
Annular Ring +/- 0.005" (0.127mm)
Blind & Buried via
3+n+3
Plug vias by conductive epoxy
Plug vias by solder mask ink
Copper Plating
Minimum in Holes 0.008"
Aspect Ratio (Drilling Hole Size /PCB Thickness 15 )
Conductors (Traces)
Finished trace size +/-20%
Min. Trace Width / Space (1 oz finished Cu) Starting from 1/3oz 0.003"/0.003" (0.08mm)
Min. Trace Width / Space (1 oz finished Cu) Starting from 1/2oz 0.004"/0.004" (0.1mm)
Min. Trace Width / Space (2 oz finished Cu) 0.008"/0.008" (0.2mm)
Min. Trace Width / Space (3 oz finished Cu) 0.010"/0.011" (0.26mm )
Min. Trace Width / Space (4 oz finished Cu) 0.012"/0.014" (0.3mm)
Inner Layers
Minimum space drill to conductor 0.006" (0.15mm)
Minimum annular ring 0.006" (0.15mm)
Layer to layer registration +/-0.005"(0.127mm)
Solder Mask
Colors Green, White, Black, Yellow, Red, Blue, Matte Green & Black
Nominal Thickness Thickness: 0.4mil to 0.6mil
Min. Solder Mask Clearance Mask Dam 3mil (Minimum )
Exposure Registration +/-3mil
Silkscreen
Colors White, Black, Yellow
Minimum Silkscreen Clearance 0.005"
Minimum Heigh /Width 0.028" / 0.028"
Board Routing & Profile
Tolerance Board Edge & Cutouts +/-0.15mm (0.006")
Score Line to Edge of Board +/-0.15mm (0.006")
Depth of V-Scoring (Board Thickness>=0.04") +/-0.1mm (0.004")
Deviation of V-scoring +/-0.1mm (0.004")
Half-Moon Shape Yes
Special Mechanical Requirements
Counter Sunk , Controlled Depth Milling, Controlled Depth Drilling
Surface Finished
HASL / Lead Free HAL Vertical 50u" to 300u"
Immersion Gold Thickness 2u" to 3u" suggested but max. 8u"
Hard Gold Thickness up to 50u" (Need copper connection)
Immersion Tin Thickness 40u" to 50u"
Immersion Silver Thickness 8u" to 12u"
OSP (Entek ) Yes
Gold plated edge connectors, Max. 50u" Au, over 120u" Ni
Quality Standard & Packing
IPC-600 Pictorial Guide Apply Class II to Determine Defects Visual Inspection 100%,
UL Certification UL 94V-0 , RoHS, SGS Inspection
ISO9001:2015
Packing Method Vacuumed Sealed Pack
