Method for producing a die attach adhesive film sheet

A method for producing a die attach adhesive film sheet, comprising:

• A. Providing a first release substrate layer, a die attach adhesive layer, and a dicing tape layer, and joining the first release substrate layer, the die attach adhesive layer, and the dicing tape layer in that order to form a multi-layer structure (i);
• B. Working the multi-layer structure (i) to form a circular preformed die attach adhesive film sheet, wherein during said working the first release substrate receives a z-directional indentation therein, wherein the z-direction indentation has a first diameter;
• and
• C. Removing the first release substrate with the z-directional indentation therein from the die attach adhesive layer, and placing in its stead a second release substrate in contact with the die attach adhesive layer to form a multi-layer structure (ii).