Pac Tech has in house design capabilities for photomasks. In order for Pac Tech to layout the redistribution or repassivation, electronic data is often required which locates the position of the bond pads relative to the fiducials.  In general Pac Tech can accept electronics files in several formats, including: GDS II data, Gerber, AutoCAD, or DXF. Pac Tech offers different polymers for use in redistribution and repassivation applications. The following table lists the properties of these polymers.

BCB

(Benzocyclobutene)

WPR

(Filled Epoxy)

PI

(Polyimide)

Dielectric Constant

2.65

3.7

3.4

Dissipation Factor

0.0008

0.030

Tg (ºC)

>350

215

255

CTE

52

56

73

Tensile Strength (Mpa)

90

90

101

Young’s Modulus (GPa)

2.9

2.2

2.4

Density (g/cm3)

1.6

Elongation (%)

8 6.4

18

Water Absorption (%)

0.2

1.5

0.6

Thickness (µm ± 1)

2 -11

5 – 25

2 – 6

Tone

Negative

Negative

Positive

Cure Temperature (ºC)

220-250 150

250-350

 

Suss Contact Aligner (MA8) Suss Contact Aligner (MA200) Blue M Cure Oven (DS266) Despatch Cure Oven (LCC)
ma8 ma200 lcc