Data on moisture absorption and dehumidification of an IC package
Pretreatment: 24-hour baking at +125ºC
Measurement condition
- Component stored in ambient environment(30 degrees C, 85%RH) for 25 hours.
- Dehumidification: The component is stored in a McDry cabinet at 5%RH for 150 hours.
- The component was baked and then stored in McDry at 5%RH. (Example of storage in a dry box at 5% RH specified by the new IPC/JEDEC J-STD-033D)
Example of low-humidity storage of laminated PCB
Multi-layered PCBs absorb moisture at a faster rate as they become thinner. Layer break off and blistering will occur during reflow if the moisture content of the PCB exceeds 0.2% (weight.) Store laminated PCBs in an ultra-low humidity dry box
PCB (Glass-epoxy substrate)
- Sample: 6-layered laminated PCB
- Dimensions: 50 x 100 x 1t (mm)
- Measurement condition
- Pretreatment: Baked for 24 hours at 125℃
- Humidification: Steamed for 2 hours
- Dehumidification: Stored in McDry box at 5% RH
PBGA Carrier Board
Test Conditions
Pretreatment: 24-hour bake at +125℃
- Component stored in ambient environment(30 degrees C, 85%RH) for 25 hours.
- After process (1), the component is stored in McDry cabinet(5%RH) for 150 hours.
- Stored in McDry cabinet(5% RH) after baking.
Data on moisture absorption and dehumidification of chip LEDs
Experiment Data on moisture absorption and dehumidification of chip LEDs
Example: LED3025 (3.0mmx2.5mmxt1.3mm) floor life 168h Pretreatment: 48 hour-Baking Process at +60C tle (LED makers’ baking guideline)
- Chip LED stored in ambient environment (30°C, 60% RH) for 168 hours.
- After 11 hours of storage in this environment, it was left for 13 hours in a dry box at <3% RH. This process was repeated 5 times from Monday to Friday and left for 61 hours in a dry box at <3% RH.
- After baking, the LED chip was stored in a dry cabinet capable of maintaining 3%RH.
(This is a similar condition with an LED chip that is stored in a dry cabinet right after opening a moisture barrier bag.)
McDry Ultra-Low Humidity Storage Cabinets Product Overview
