Patent ID: 8143169
Filing Date: 2012-03-27
Classification: G01D,H01L

Abstract:
1. A method, comprising: attaching at least one die to a leadframe having lead fingers; attaching wirebonds to make connections between the at least one die and the leadfingers; injecting a first mold material at a first pressure for preventing wire sway of the wirebonds, encapsulating the wirebonds, and covering at least a portion of the at least one die and the leadfingers to form an assembly, wherein the first mold material is only on a die-side of the leadframe and overmolds all wirebonds connected to the at least one die; waiting for the first mold material to at least partially cure; securing a magnet to the assembly; injecting a second mold material at a second pressure greater than the first pressure for overmolding the at least one die, the first mold material, and the magnet; and selecting a material for the first mold material based at least in part upon similarity of coefficient of expansion with the magnet.