Patent ID: 11864471
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 14:
15. A method, comprising:
forming semiconductor dies on a semiconductor wafer, the semiconductor dies including at least one Hall sensor, the at least one Hall sensor being arranged along a plane that is parallel to a device side surface of the semiconductor dies;
depositing a layer of polyimide material over the device side surface of the semiconductor dies;
depositing a seed layer over the first layer of polyimide material;
depositing a photoresist layer over the seed layer;
patterning the photoresist layer to form openings exposing the seed layer over the device side surface of the semiconductor dies; and
forming passivated magnetic concentrators over the device side surface of the semiconductor dies by performing:
plating a layer of magnetic alloy in the openings;
removing the photoresist layer, the layer of magnetic alloy having an upper surface facing away from the device side surface of the semiconductor dies, and having exterior sides extending from the upper surface to an opposing bottom surface that is over the device side surface of the semiconductor dies; and
forming a second layer of polymer material over the layer of magnetic alloy, the second layer of polymer material covering at least the upper surface of the layer of magnetic alloy.