T0247 Datasheet, PDF (29/35 Pages) International Rectifier – Fit Rate / Equivalent Device Hours

ACCELERATEDMOISTURE RESISTANCE (A/C)Unbiased
Conditions
Temperature:
Pressure:
Bias:
Duration:
Test points:
121°C
15Ibs psig
None
96 Hours nominal
96 Hours
Purpose
Accelerated Moisture Resistance test is performed to evaluate the moisture resistance
of non-hermetic packages. Severe conditions of pressure, humidity and temperature
are applied that accelerate the penetration of moisture through the interface of the
encapsulant and the conductors that pass through it.
Failure Modes
There are two failure modes which have been observed. The first mode, degradation
of the breakdown characteristics of the devices, can occur.
The second failure mode that has been observed is due to cathodic corrosion of
aluminum emitter bonding pad. Water will ingress to the top of the die. It is possible
for contaminants to work their way into the active area of the device while under
pressure in the presence of water. For that reason, the devices and test board are
cleaned prior to use. Then, throughout the course of the testing, the parts and the test
boards are never brought into contact with human contaminant.
Sensitive Parameters
IGBT / CoPack
Quarterly Reliability Report
V_(BR)CES, V_CE(on)
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