PCB Assemblies Used For Washing Machine

Material

Laminate materials

FR4,Alu,CEM3,Taconic,Rogers

Board cutting

Number of layers

1-24

Min. Thickness for inner layers 

(Cu thickness are excluded)

0.003”(0.07mm)

Board thickness

Standard

0.04-0.16”±10%(0.1-4mm±10%)

Min.

Single/Double layer: 0.008±0.004”

4 layer: 0.01±0.008”

8 layer: 0.01±0.008”

Bow and twist

<7/1000

Copper weight

Outer Cu weight

0.5-4 oz

Inner Cu weight

0.5-3 oz

Drilling

Min size

0.0078” (0.2mm)

Drill deviation

±0.002” (0.05mm)

PTH hole tolerance

±0.002” (0.005mm)

NPTH hole tolerance

±0.002” (0.005mm)

Plating

Min hole size

0.0008” (0.02mm)

Aspect ratio

20 (5:1)

Solder mask

Color

Green,white,black,red,yellow,blue...

Min solder mask clearanace

0.003” (0.07mm)

Thickness

0.0005-0.0007”(0.012-0.017mm)

Silkscreen

Color

White,black,yellow,red,blue...

Min size

0.006” (0.15mm)

E-test

Flying Probe Tester

Y

Controlled Impedance

Tolerance

±10%

Impedance tester

Tektronix TDS8200

Surface Finish

HASL,ENIG,immersion silver,immersion tin,OSP...