Method for determining lead frame failure modes using acoustic e

Details Method for determining lead frame failure modes using acoustic e Method for determining lead frame failure modes using acoustic e

1981-11-30

1983-11-29

Kreitman, Stephen A.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

73587, G01N 2900

Patent

active

044174780

ABSTRACT:
An automatic pull tester and an acoustic emission system are herein combined to analyze the failure modes of lead frames bonded to integrated circuits. By using a discriminant analysis technique, a specific failure mode can be determined in real-time by first measuring up to five variables during the pulling operation. The five variables that may be measured comprise acoustic emission signals of a first amplitude (AE1), acoustic emission signals of a second amplitude (AE2), the time elapsed until failure (.DELTA.t), the number (n) of acoustic emission bursts above a first threshold, to the peak pulling force at failure (L.sub.max). Next, the variables measured are incorporated into a plurality of predetermined functions, each function corresponding to one failure mode (FM1 to FM5). The failure mode of the bond is determined by selecting the function having the highest value (FIG. 4).

REFERENCES:
patent: 4107981 (1978-08-01), Kanagawa
patent: 4207771 (1980-06-01), Carlos et al.
patent: 4232558 (1980-11-01), Jon et al.
patent: 4297885 (1981-11-01), Hein, Jr. et al.
patent: 4317368 (1982-03-01), McElroy
Monitoring Crack Growth in Ceramic by Acoustic Emission, Materials Evaluation, Dec. 1970, pp. 267-270, by Romrell.
Intro. to Multivariate Statistical Analysis; by Anderson, T. W., John Wiley & Sons Inc., 1958 pp. 5-58.

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