Cofan PCB offers the highest quality PCB manufacturing and PCB assembly services from one of the largest PCB manufacturers in China.  We specialize in PCB prototyping, PCB manufacturing, and PCB Surface Mount Assembly services. The company uses state-of-the-art PCB manufacturing equipment, complimented by the latest inspection equipment for manufacturing close-tolerance boards up to 24 layers. We are proud to offer copper thicknesses up to 6 oz, hidden or blind vias, high frequency, aluminum based and customer specified PCBs. Our manufacturing facilities our ISO:9001:2000 qualified and we work within customer requirements to deliver error-free products with on-time-deliveries.  We offer Quick-Turn of prototype designs with overnight deliveries to anywhere around the globe.

PCB Artwork Requirements:

Minimum Line Width: 0.004"
Minimum Space: 0.004"
Minimum Pad Size (Inner Layer): Finished Hole Size + 0.020"

Minimum Pad Size (External Layer): Finished Hole Size + 0.014" Clearance

• Pad Clearance (Min/Side): 0.003
• Feature Spacing to Allow Damming: 0.003 LPI
• Pads for Non-PTH Holes To Be Removed: < Hole Size + 0.020"

PCB Inner Layer Imaging:

Minimum Line Width (Finished): 0.004" On 1/2 OZ. Copper
Minimum Spacing (Finished): 0.004" On 1/2 OZ. Copper
Minimum Core Thickness (Rigid): 0.004"
Minimum Core Thickness (Flex): 0.002"

PCB Multilayer Lamination:

Maximum Number of Layers: 16
Maximum Finished Panel Thickness: 0.200"
Thickness Tolerance: +-5% or +-0.005" Whichever is greater
Thickness Across Panel: +-0.004"
Warp age: 0.05%

PCB Drilling:

Location Tolerance: 0.0003
Minimum Drilled Hole Size: 0.009"
Minimum Hole Size Finished: 0.006"
Plated Holes Tolerance: +-0.002"
Non-Plated Holes Tolerance: +-0.001"

PCB Imaging External Layers/Etching:

Minimum Line Width on 1/2 OZ. Base Copper (Finished): 0.004
Minimum Spacing on 1/2 OZ. Base Copper (Finished): 0.004"
Maximum Tented: 0.187"
Registration Tolerance: +-0.003"

PCB Copper and Tin Plating/Hasl

Copper Thick Tolerance in Hole: 0.0005" - 0.0000"
Maximum Panel Thickness: 0.200"
Maximum Aspect Ratio: 10:1

PCB Gold Plating

Immersion Nickel Gold: 100 Micro inches Nickel, 3-6 Micro Inches Gold
Gold Purity: 99.7%
Gold Hardness: 130-200 KNOOP
Tab Plating

• Nickel Thickness: 100 Micro Inches
• Gold Thickness 35-50 Micro Inches

Deep Gold

• Nickel Plating Thickness: 100 Micro Inches
• Gold Plating Thickness: As Required

Additional Finishes

• Immersion Tin
• OSP
• Imm Au
• Silver
• Sn100c
• Carbon Ink

PCB Solder Mask Photoimageable:

Plugging Capability: tent only with LPI (see Solder mask Wet for plugging)
Minimum Solder mask Thickness: 0.001"
Registration Tolerance: +-0.005"

PCB Solder Mask Wet

Plugging Capability: Yes (TAIYO S-222NA)
Minimum Solder mask Thickness: 0.0005"
Registration Tolerance: +-0.005"

PCB Nc Routing

Maximum Router Size: 0.125"
Minimum Router Size: 0.031"
Dimensional Tolerance: .005