REST - RUBBER EPOXY STAMPING TOOLS

Rubber epoxy stamping tools offer an inexpensive solution for epoxy dispensing, especially for prototyping and small production runs. Typically the REST tools are used on die sizes from .051" / 1.30mm and above.

The design provides a dot matrix epoxy print out. The layout of the tool pins ensure a consistent amount of die attach material to be placed on the pad area.

Three rubber pad patterns are available with different dot diameter and pitch configurations:

• Pad # 3, dot diameter .0118" / 0.30mm, pitch .031" / 0.80mm

• Pad # 5, dot diameter .0197" / 0.50mm, pitch .040" / 1.00mm

• Pad # 6, dot diameter .0236" / 0.60mm, pitch .040" / 1.00mm

How to select:

Even if empirical experiments give only true image of the final dispense output, we can approach the desired result by considering the following rule of thumb.

• The epoxy coverage of the tool chosen must be larger than the die size while the physical pad patteren PL x PW should be equal or smaller than the die size. For the standard pad layout, the value PL, PW, DL, DW are given in the table and can be calculated with the following formula :

• When the die is pressed onto the epoxy layout, enclosed by the dot outline DL x DW, the die attach material will spread out and the epoxy coverage will be extended by approximately:

• Whenever possible it is advisable to choose a pattern that has closer gaps between the dots. For high epoxy viscosity, best results are obtained with larger dot spacing.