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Design Guidelines and Manufacturing Capabilities

Listed below is a detailed list of our capabilities and design guidelines. Keeping your designs within our standard and advanced capabilities will yield the most competitive pricing. Our emerging technology capabilities support the most advanced PCB designs and we recommend having a DFM completed by CircuitsNow’s pre-engineering team.

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Laminate MaterialsLines, Spaces, & Pad DiametersElectroplatingConductor Finishes

Lead Free Finishes  | Tolerances  | Via CapabilitiesSoldermask and Legend

Standard Advanced Emerging
Panel Size 18″ X 24″ & 19″ X 25″ 21″ X 24″ & 24″ X 30″  21″ X 24″ & 24″ X 30″
Layer Count 2 to 36 48+ 60+
Laminate Materials
FR4 Tg 140 Yes Yes Yes
FR4 Tg 170 Yes Yes Yes
GETEK Yes Yes Yes
Rogers Yes Yes Yes
Polyimide Yes Yes Yes
Duroid Yes Yes Yes
RoHs Materials Yes Yes Yes
Polyclad 370 HR Yes Yes Yes
Isola 410 Yes Yes Yes
TUC Yes Yes Yes
Halogen Free Yes Yes Yes
Stablcor Yes Yes Yes
Exotic Material Types Yes 35+ 40+
Finished Thickness [Multilayer] .005″ to .220″ .220″-.250″ Greater than .250″
Minimum Core Thickness .002″ .002″ .001″
Finished Thickness Tolerance [+/-] 10% 7% 5%
Multiple Laminations 5 9 12+
Copper Foil Weights Internal 1/4 to 2 Up to 6 ounce Up to 6 ounce
Copper Foil Weights External 1/4 to 3 Up to 4 ounce Greater than 6 ounce
Lines, Spaces, & Pad Diameters
Internal Line Width .0035″ .002” Less than .002″
Internal Spacing .0035″ .002″ Less than .002″
External Line Width .0035″ .002″ Less than .002″
External Spacing .0035″ .002″ Less than .002″
Int. Pad Size-A/R Per Side (Fin.-.001) .005″ .004″ Less than .004″
Ext. Pad Size-A/R Per Side (Fin.-.002) .003″ .003″ Less than .003″
SMT Pitch .010″ .010″ Less than .010″
Impedance 10% 5% Greater than 5%
Electroplating
Tin Lead Plating Thickness .0003″-.0005″ Greater than .0005″ Greater than .0005″
Tin Nickel Plating Thickness 150Microinches 250 Microinches Greater than 250 Microinches
Low Stress Nickel 100 Microinches 250 Microinches Greater than 250 Microinches
Gold Plating Thickness 30 Microinches As Specified As Specified
Minimum Drilled Hole Size 0.012 .0098″ Less than .0059″
Hole Aspect Ratio 10 to 1 15 to 1 Less than 20 to 1
Conductor Finishes
HASL Yes Yes Yes
Solder with Reflow Yes Yes Yes
White Tin Yes Yes Yes
Carbon Ink Yes Yes Yes
Lead Free Finishes
Electroless Nickel/Paladium/Gold Yes Yes Yes
Electroless Nickel/Immersion Gold Yes Yes Yes
Immersion Silver Yes Yes Yes
Entek Plus HT Yes Yes Yes
HASL Yes Yes Yes
Tolerances
Drilled Hole To Copper .008″ .007″ .006″
Non Plated Hole Tolerances [+/-] .001″ .001″ Less than .001″
Fabrication Tolerances [+/-] .005″ .003″ Less than .003″
Via Capabilities
Laser Micro Vias .004″ .002″ Less than .002″
Blind/Buried Vias .004″ .002″ Less than .002″
Via Under PAD Yes Yes Yes
Back Drill Yes Yes .008″ larger than Primary Drill
Back drill Antipad Yes Yes .020″ larger than Primary Drill
Castellation Yes Yes Yes
Laser Drill .004 .002 Less than .002
Mechanical Vias .0059 .0047 Less than .0047
Tented LPI Coated With LPI Coated/plugged Coated/plugged
Plugged UV Curable [no solvent] Maximum .020″ Yes Yes
Silver Conductive Via Fill Yes Yes Yes
Non-Conductive ViaFill Yes Yes Yes
Soldermask and Legend
Minimum Mask Clearance [LPI] .003″ .002″ Less than .002″
Minimum Soldermask Thickness 0.0004″ 0.0004″ 0.0004″
Gasketed Chip Scale Packaging .002″ .001″ Less than .001″
Soldermask Type LPI Dry Film As required
Soldermask Color Green Any Color Any Color
Soldermask Web Minimum .004″ .003″ Less than .003″
Legend Color White Any Color Any Color
Legend Feature Size .008″ wide x .030″ high .006″ wide x .03″ high min LPI Legend .003″ x .02″
Flatness (Symmetrical construction) IPC Standard Review Required Review Required
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