Tin Whisker Acceptance
EquipmentTin Whisker
Thermo - humidistat, Temperature Cycle Equipment
Utilising thermo - humidistat and temperature cycle equipment depending on testing conditions
Introduction
Reliability test for temperature-sensitive user environments; Semiconductor certification criteria
Application
In order to evaluate the defective mechanism of corrosion and migration, the product is evaluated under three conditions: 1) high temperature, 2) high humidity, and 3) power supply. However, migration tends to occur before corrosion, making it difficult to obtain corrosion tolerant data. Therefore, the test removes the third condition and intensively evaluates defective mechanisms of corrosion only under 1) high temperature and 2) high humidity conditions.
The Equipment
Tin Whisker Acceptance
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Manufacturer / Model
Use of thermo - humidistat and temperature cycle equipment according to the required testing conditions
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USE
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Reliability Testing of User Environments with Large Temperature Changes
Semiconductor Certification Category
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Test Method
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The test is called the Autoclave test or Pressure Cooker Test (PCT), and it evaluates whether the product can withstand high temperature and humidity. It is used especially for accelerating internal metal corrosion, such as product die metalization. Samples are typically tested for 168 hours under a temperature of 121°C, relative humidity of 100%, and atmospheric pressure of 2 atm. Intermediate measurements are conducted at 48h and 96h. Electrical leakage may occur due to the maximum humidity during the Autoclave test, but this leakage will not increase defective count unless otherwise defined as defective. Only corrosion or other permanent damage is defined as poor PCT.
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Test Condition
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Stress Type
Test Conditions
Inspection Interval
Temperature Cycling
-55 +0/-10 °C to 85 +10/-0 °C,
air to air; 10 minute soak;~3 cycles/hour (typ.)500 cycles
-40 +0/-10 °C to 85 +10/-0 °C,
air to air; 10 minute soak;~3 cycles/hour (typ.)Temperature /
Humidity Storage30 ±2 °C and 60 ±3% RH2
1000 hours
High Temperature /
Humidity Storage55 ±3 °C and 85 ±3 RH 3
1000 hours
Technical Use Case
Related Standards
- JESD201
- JESD22-A121