Die Shear Strength

Eb 470


What is die shear strength? Die Shear strength is a determination of adhesion of a semiconductor die to the package’s die attaches substrate by subjecting the die to a stress that’s parallel to the plane of die attach substrate, resulting in a shearing stress between the die-die attach material interface and the die attach material-substrate interface. Why is die shear strength important? The general purpose of die shear testing is to assess the over-all quality of the die attach process, including the integrity of the materials and the capabilities of the processes used in mounting the die (and other elements, if any) to the package substrate

EB-470 has been used for years in die attach process of heat sinks, LEDs, lead wires etc. EB-470 has a die shear strength of over 3400psi. EB-470 has a convenient 1:1 mix ratio, is stable at room temperature for over 2 days, and can cure within 5 minutes at 150°C. EB-470 has a thermal conductivity of over 1.0 W/mK and is an ideal alternative to more expensive, silver filled epoxies for low powered heat sinks.

Product Specifications

No.of Components 2
Mix Ratio by Weight 100/100
Mixed Viscosity @RT(cps) 5000-8000
Pot Life @25°C(100 gram) 48 hrs
Recommended Cure 5-10min @150°C
Alternate Cure 1min @ 175°C
Color Grey
Specific Gravity 1.9
Hardness(Shore) D-86
Refractive Index NA
Lap Shear Strength @25°C(psi) 2000
Tg(°C) 98
CTE(Below Tg)10-6/°C 28
Service Temp.Range -55°C to 250°C
Thermal Conductivity(W/m°K) 1.0
Volume Resistivity(500 V) 6x1015

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