Continuous Current Long Lengths
The current carrying capacities of fine Au, Al-1%Si and pure Al wires are very similar. The burn-out (fusing) current for relatively long lengths of 1 mil (25 µm) diameter wire is approximately 0.5 amp.
For safety in most applications, it is recommended that the design maximum current should not exceed approximately one third of the burn-out value.
Design Rule
Pulse Current 25% Duty Cycle
Short Lengths 1 Mil Au Wire
The graphs illustrate the independent influences of loop height, bond span and hook position on the theoretical pull strength measured for the simplified wire bond geometry shown above.
The graphs emphasize the importance of geometry in the application and interpretation of pull strenght tests.
Where:
P = Pull Strength
H = Loop Height
S = Bond Span
T = Tension in Wire / Bond
For a more comprehensive analysis of the wire pull strength test, the reader is referred to the A.S.T.M. Standards F-458 and F-459 and by further inquiry to our company.
Wedge-Bonded, 1.25 Mil Diameter Al-1%Si Wire In A 300 I/O Quad Package.
Such complexity requires precise and uniform wire properties.
Al-Si Binary Equilibrium Phase Diagram
The phase diagram illustrates the potential of this binary alloy system for providing classical dispersion strengthening mechanisms.
The stability and consistency of fine Al-Si wires depends upon the provision of a very fine, uniform, silicon particle dispersion.
