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HDC3020-Q1: contamination by FR4 dust

Lenio Cacula
Genius 16700 points
Part Number: HDC3020-Q1
Other Parts Discussed in Thread: HDC3020

Tool/software:

This customer built a batch of 200 boards. Some routing of the PCB happened after the boards were assembled which resulted in contamination of the polymer (these are parts without tape or membrane). The questions is whether these boards are usable at all. Would blowing off with compressed air be advisable? Is there a way to save the boards?

Thank you!

  • +1
    TI__Genius 12185 points

    Lenio,

    I think these boards can be saved, I would try blowing off the dust with compressed air like you suggested. Doing so may dry out the polymer, but that is a small concern relative to removing the dust. Once as much dust as possible has been blown off, try measuring the RH and see if it is accurate, ideally at more than one RH level. Hopefully the impact to RH accuracy is minimal after blowing the dust off.

    Next time the customer wants to make some PCB modifications after the HDC3020 is placed on the PCB, make sure they manually place a polyimide tape cover over the sensor area to protect against dust intrusion like this.

    Thanks

    -Alex Thompson