Glob top adhesives for die coating feature optimised flow properties
DELO has developed new glob top adhesives featuring optimized flow properties. They allow chips, for example in MEMS sensors, to be coated in a uniform thickness of less than 100 µm that does not extend beyond the chip edges. Increasing miniaturization in microelectronic packaging gives rise to new demands on the glob top materials used.
Far more than just an adhesive
Adhesives developed by DELO have a low viscosity and special flow properties. They can thus be processed efficiently by jetting and, compared to conventional die coating materials, make it possible to achieve a homogenous flat surface with a layer thickness of less than 100 µm using just a few drops. A further benefit is the high flexibility (Shore hardness A60) reducing the risk of stresses in the chip and the wires.
In addition to the small coating thicknesses, there is another positive aspect; the black-colored adhesive not only protects and preserves the chip surface but also covers its logic structures. This special black-colored adhesive also makes it possible to perfectly cover the chip corners where the layer is particularly thin. Another advantage is that the optimized flow properties allow a wide range of chip sizes to be coated.