Item

Current

2013

2014

Max. Layer

48

36

40

Track width/space

inner（mil）

2 / 2

3 / 3

2.5/ 2.5

outer（mil）

2 / 2

4 / 3

3 / 3

Aspect Ratio

16 : 1

14 : 1

15 : 1

Copper Weight (oz)

12

8

10

Impedance tolerance

±5%

±8%

±5%

Material

Microwave material

SV

SV

SV

Via in pad

SV

SV

SV

Lead-free

MP

MP

MP

Mix lamination

SV

P

SV

Metal Based/Core

SV

P

SV

HiTg

MP

MP

MP

HDI

4+N+4

SV

/

P

Buried resistance/electric capacity

SV

/

P

P: Prototype SV: Small Volume    MP: Mass Production