Pressure Cooker Test (PCT)
Pressure Cooker Test (PCT),
Pressure Pot Test (PPOT),
is a reliability test performed to assess the ability of a product to
It is used primarily to accelerate corrosion in the
metal parts of the product, including the metallization areas on the
surface of the die. It also subjects the samples to the high vapor
pressure generated inside the autoclave chamber. Figure 1 shows
examples of autoclave chambers.
1. Examples of Autoclave Chambers from Trio Tech
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testing consists of
the samples for
121 deg C,
100% RH, and 2 atm. Intermediate
readpoints at 48H and 96H
may also be employed.
Surface-mount samples are
prior to autoclave testing. Preconditioning
simulates the board
mounting process of the customer. It normally consists of a
to drive away the moisture inside the packages of the samples, a
drive a controlled amount of moisture into the package, and three cycles
of IR or vapor reflow.
preconditioning, failures from which are considered as preconditioning
autoclave failures. Preconditioning failures should be taken
seriously, since these imply that the samples are not robust enough to
even withstand the board mounting process.
2. Another Example of an Autoclave Chamber
the extreme moisture condition during autoclave testing,
moisture-related electrical leakage failures may be encountered after
the test. Unless predefined to be so, such failures must not be
considered as valid PCT failures. Only
failures, such as those arising from corrosion, are considered valid PCT
Test or PCT; Temperature
Heat Resistance Test (SHRT);
Package Failures; Die
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