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Wafer Bumping2022-11-01T13:15:41+01:00

Wafer Bumping Machine

Wafer bumping is often separated into two different categories: flip chip bumping (FC) and wafer level chip scale packaging (WLCSP). This categorization and affiliated nomenclature is partially based on the solder bump size and the type of equipment used to create the bump.

“Flip Chip” refers to bumps on semiconductor wafers which are in the range of 50 to 200 µm in height and are usually assembled using and underfill material between the die and the substrate.

“WLCSP” refers to bumps that are in the range of 200 to 500 µm in height and are usually assembled without an underfill material.

The basic flow for each of these technologies is to first deposit a barrier metal on top of the bond pad of the wafer (Under-Bump Metallization or UBM) followed by deposition of the solder.

Solder Ball Wafer Bumping
Wafer Bumping Solder Alloys2022-03-10T14:16:08+01:00
  • SnAgCu (SAC305, SAC405, SAC105)
  • SnAg
  • PbSn 95/5, PbSn 90/10
  • AuSn 80/20
  • InSn
  • SnBi

Wafer Bumping Equipment


Ultra-SB² 300

Ultra-SB2 is a fully automated solder bumping equipment integrating flux printing, ball placement, 2D inspection and wafer level rework.


PacLine 300 A50

The PacLine 300 A50 is a fully automated machine for electroless deposition of Ni/Au, NiPd or NiPdAu bumps on semiconductor wafers.



The SB2-SM is a machine for prototyping and small volume production that has wider working area than the SB2-M and more optional features.

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