Automobile chassis brake system about the Cars Circuit Board

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4-layers, board thickness 1.6mm

Min hole size 0.4mm, High TG

Immersion gold with impedance

Basic copper 2OZ

2-layers, board thickness1.6mm

Min hole size 0.4mm

Immersion Gold

Basic copper 2OZ

2-layers, board thickness1.6mm

Min hole size 0.8mm

LF HASL

Basic copper 1OZ

2-layers, board thickness1.6mm

Min hole size 0.4mm

Immersion Tin

Basic copper 1OZ

2-layers，board thickness1.6mm

Min hole size 0.3mm

Immersion Gold

Basic copper 1OZ

FR-4 PCB Technical Capability

Item	Normal capacity	Limit capacity	Item	Normal capacity	Limit capacity
Layer No.	2-16	≤20	Max. copper thickness( Inner layer)	4OZ	5OZ
Core board thickness	0.075-2.0mm	0.05-3.0mm	Max. copper thickness( Outer layer)	4OZ	6OZ
min. PTH to copper	165.1um	152.4um	Min. space between SMD pads for S/M bridge	203.2um	177.8um
Board thickness(double sides)	0.3-3.2mm	0.3-4mm	Minimum legend width/height	127um /762um	101.6um /609.6um
Board thickness (Multi-layer)	0.6-3.2mm	0.6-4mm	Outline dimension tolerance	±101.6um	±76.2um
Tolerance of board thickness（T≤0.8mm）	0.1mm	0.075mm	Bow & twist （T≤1mm）	≤0.75%	≤0.5%
Tolerance of board thickness （T＞0.8mm）	±10%	±5%	Bow & twist （T≤1mm）	≤0.5%	≤0.3%
Min. line width	76.2um	63.5um	Precision of hole to hole	±0.05mm	/
Minimum line space	68.58um	63.5um	Impedance control range	±10%	±8%
Minimum hole diameter	0.2mm	0.15mm	Aspect ratio (0.2mm）	10:1	12:1
Tolerance of press fit hole diameter	0.05mm	0.05mm	Finished product size	55-600mm	10-620mm
profiling method	CNC、 V-CUT、 Punching or mold
Surface treatment	EING、 OSP、 Immersion silver、 Selective OSP+ENIG
Laminate type	FR-4.0, FR-4.1(Normal TG, middle TG, high TG), CEM-3,

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Introduction of FR4 materials

FR in FR4 represents a flame retardant, and the number 4 distinguishes the material from other materials in this class.FR4 is a glass fiber reinforced epoxy laminate that looks like a thin woven cloth sheet. The term FR4 also represents the grade used to make these laminates. The fiberglass structure provides structural stability for the material. The glass fiber is covered with flame retardant epoxy. This gives the material durability and strong mechanical properties. All of these features make the FR4 printed circuit board very popular among electronic contract manufacturers.

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