Patent ID: 9721855
Date: 2017-08-01
CPC Classifications: B23K,H01L

Claim:
1. An apparatus comprising: a magnetic unit, configured to manipulate a position of one or more solder balls of a chip relative to the one or more pads of a substrate by moving a ferrofluid, using a magnetic field; a control unit, comprising: a memory, a processor, communicatively coupled to the memory wherein the memory includes a stored control program including instructions for executing on the processor to cause the control unit to: deposit the ferrofluid, the ferrofluid being a colloidal liquid made of magnetic nanoparticles suspended within a solvent and having a particular surface tension, onto the substrate having one or more pads that are electrically coupled to a semiconductor layer; place the chip with one or more solder balls that electrically coupled to logic elements of the chip, onto the deposited ferrofluid; support the chip on the ferrofluid, in a substantially coplanar orientation to the substrate; determine that the one or more solder balls of the chip are misaligned from a desired location on the one or more pads of the substrate; and adjust, in response to the determination that the one or more solder balls of the chip are misaligned from the desired location on the one or more pads of the substrate, a position of the ferrofluid within a three-dimensional space with the magnetic unit until the one or more solder balls of the chip are aligned in the desired location on the one or more pads of the substrate.