Kulicke & Soffa Capillary Nomenclature

Capillary Nomenclature: Explanation of common features and selection criteria for ball bond capillaries from Kulicke & Soffa, along with the key selection criteria to consider when choosing capillaries (IKB-011).

Capillary selection is key to a successful and stable ball bonding process. Capillaries are high precision manufactured, with attributes specific to the wire diameter in use and bonding process parameters.

Capillaries are manufactured from two main materials:

Toughened Alumina
ATLAS (very high mechanical strength Alumina)

The figure below describes the K&S capillary nomenclature:

There are many factors to consider when selecting the correct capillary. The figure below will show you some of the other considerations that need to be taken into account:

• Hole Diameter (H):
This contributes to bond placement accuracy and wire clearance during looping.

• Length (L)
This contributes to the need for deeper access in products.

• Outer Radius & Face Angle (OR & FA)
This contributes to the formation and finish of the 2nd bond (stitch).

• Inner Chamfer Angle (ICA)
This contributes to the housing and formation of the F.A.B (Free Air Ball).

View the range of “K&S Wire Bonding Capillaries“.

View the range of “MPP Equipment for Wire Bonding“.

View the range of “K&S Automatic Wire Bonders“.

View the “K&S Website“.

Author

Date

Version

Author

Alex Forster

Date

11 December 2019

Version

IKB011 Rev. 2

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