当前位置:首页 > Article,Papers > Underfills and Encapsulants

Underfills and Encapsulants

Underfills and Encapsulants

 

Epoxy based underfill and encapsulant products from United Adhesives are for semiconductor applications such as to attach chip-on-board, bare die, BGA, flip-chip, CSP, etc, or to under-fill the gap between die /chip and substrate, or to encapsulate dies, chips, components, or powder devices.

They provide various superior features such as:

–                Excellent capillary flow capability.

–                High Tg formulation for high temperature stability

–                Very low CTE formulation to minimize the thermal mismatch

–                High voltage insulation formulation

–                Strong bond to FR4, ceramic, polyamide, metals, and other difficult          materials

–                Good dielectric property. Low current leakage

 

Thermally conductive underfills are also available.

 

 

 

 

Name

TUF1210

UF1220

UF1230

UF1240

RUF1250

SE1260

Features / Advantages

Thermally conductive underfill. Capillary Flow. Dielectric.

Low thermal expansion and high Tg.

Extremely Low CTE underfill with high Tg. Capillary Flow. Good Dielectric. Low current leakage.

Low CTE, high Tg underfill. Excellent thermal stability. Capillary flow. Good Dielectric. Low current leakage.

High bonding strength with rubber toughened. Capillary flow. Strong bond to polyimide, silicone nitride surfaces.

Reworkable underfill formulation. Capillary Flow. Apply heat to lift the BGA / die.

 

Soft epoxy encapsulant for thermal stress release. Capillary flow. Excellent bonding to most plastic and metal surfaces.

Typical Application

Semiconductor encapsulant for chip-on-board, Bare Die, BGA, CSP, etc, that need to good heat dissipation

For applications that require extreme low CTE such as in Flip-Chip, Chip-on-Board devices.

Underfilling or encapsulating for chip-on-board, bare die, BGA, flip-chip, CSP,applications that require low CTE.

For underfill or encapsulation applications in electronics that require strong bonding and toughness.

To underfill components such as chip-on-board, bare die, BGA, flip-chip, CSP, etc. that require reworkable capability.

Low stress bond & flexible underfill. Bond to PBT, PPS, Nylon, PC, Phenolics and other difficult materials.

Viscosity @25C (cps)

8,000

12,000

8,000

5,000

4,000

5,000

Part / Component

One

One

One

One

One

One

Work life (hr)

24 hrs @25C

24 hrs @25C

24 hrs @25C

24 hrs @25C

24 hrs @25C

24 hrs @25C

Cure Rate

125C 25 min

150C 15 min

125C 25 min

125C 30 min

125C 30 min

125C 30 min

Shelf Life (days)

> 3 months @ -40C

> 3 months @ -40C

> 3 months @ -40C

> 3 months @ -40C

> 3 months @ -40C

> 3 months @ -40C

Thermal Stability

-80 to 200C

-80 to 200C

-80 to 200C

-80 to 200C

-80 to 200C

-80 to 180C

Tg

125

145

155

125

115

< 85

CTE (ppm/C)

< 80 (above Tg)
23 (below Tg)

48(above Tg)
10 (below Tg)

< 80 (above Tg)
< 20 (below Tg)

< 80 (above Tg)
< 20 (below Tg)

< 110 (above Tg)
< 50 (below Tg)

115

Storage Shear Modulus

7.0 Gpa

8.8 Gpa

7.6 Gpa

7.0 Gpa

5.0 Gpa

Shore A =65

Volume Resistivity
(Ohm-cm)

> 10E14

> 10E14

> 10E14

> 10E14

> 10E14

> 10E13

Dielectric Strength (KV/mm)

> 500 V/mil

> 500 V/mil

> 500 V/mil

> 500 V/mil

> 500 V/mil

> 400 V/mil

Dielectric Constant @100Hz, 25C

3.5

3.5

3.5

3.5

3.5

4.0

Adhesion (Al/Al Lap Shear, psi)

> 1800 psi

> 1800 psi

> 1800 psi

> 1800 psi

> 1500 psi

> 500 psi

Thermal Conductivity (W/mK)

1.4

~ 0.7

~ 0.6

~ 0.6

~ 0.5

~ 0.3

       

      

      

    

发表评论: