Accelerated Incoming Thermal Soak Verification Procedure for Sensor Lots
Accelerated incoming thermal soak verification exposes latent transducer parameter drift within 48 hours, enabling quantitative C=0 lot rejection before production integration.
J-STD-020 Bake Limits
Specific Restoration
Thermal constraints for removing moisture from plastic integrated circuit packages without damaging the materials. The j-std-020 bake limits define how long a component can be heated when a device has exceeded its floor life. This process is necessary to prevent internal delamination during soldering.
Oxidation Control
Exposure to high temperatures in an air environment promotes the growth of oxides on the metallic leads. The j-std-020 bake limits are designed to minimize this effect so that the parts remain solderable after the moisture is removed. Lower temperatures are preferred for longer durations to reduce the chemical reaction rate.
This protects the finish of the component.
Intermetallic Growth
Heat drives the diffusion of metals at the interface of the lead and the plating. The j-std-020 bake limits prevent the formation of intermetallic layers that could make the leads brittle. If the bake is too long or too hot, the mechanical strength of the solder joint may be compromised.
These limits are verified through cross sectional analysis.
Process Application
Operators must follow the bake tables based on the moisture sensitivity level and the package thickness. The j-std-020 bake limits provide different options for baking at one hundred twenty five degrees or lower temperatures like ninety degrees Celsius. Each option has a corresponding time requirement to achieve the same level of drying.
This allows for flexibility in the production schedule.