A semiconductor device includes a first device having a first pad; a second device having a second pad; and a bonding wire electrically connecting the first device and the second device to each other via the first pad and the second pad. The bonding wire includes: a first bonding structure provided at a first end of the bonding wire, electrically connected to the first device and includes: a first ball bonding region; and a first stitch bonding region; and a second bonding structure provided at a second end opposite of the first end of the bonding wire and electrically connected to the second device.

Provided is a semiconductor package including a chip stack that includes first and second semiconductor chips stacked in a first direction and offset in a second direction intersecting the first direction, each of the first and second semiconductor chips comprising chip pads in the second direction, a redistribution substrate on the chip stack, first bonding wires connecting the redistribution substrate and the chip pads of the first semiconductor chip, and first vertical wires connecting the redistribution substrate and the chip pads of the second semiconductor chip. Each of the first bonding wires includes a first portion in contact with one of the chip pads of the first semiconductor chip and having a first width, and a second portion extending perpendicularly on the first portion and having a second width, each of the first vertical wires has a third width, and each of the second and third widths is smaller than the first width.