Cleaning No Clean Flux/Paste Series – Part 6

Cleaning Under BTCs and other flush mount components.
– Zach Papiez

Q: Why are BTCs so hard to clean?

A: Because they have low standoff heights, they are often packed condensed together, making wash fluid contact tricky.

Q: How does the IC data compare to the SIR data?

A: It depends. The golden scenario for these two test methods would be that the SIR exhibits a failing data set, and the IC could identify the ion species responsible, along with its concentration on the board. They fundamentally test different things but can often be used in conjunction to identify failures.

Q: How can I tell if my BTCs are clean enough?

A: Test methods such as SIR and IC can serve as process qualifiers and monitor tools to ensure that your process is clean and stays clean.