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HDC3022: HDC3022DEJR : Rework precisions

Antoine Angelo
Prodigy 10 points
Part Number: HDC3022

Tool/software:

We noticed a browned appearance on a component that we assembled by hand (it's our prototype process, temperature is less well-controlled).

We therefore believe that the component is damaged and we are wondering about the rework conditions.

According to the datasheet, here are the conditions:

8.4.3.3 Rework
TI recommends to limit the HDC302x to a single IR reflow with no rework, but a second reflow can be possible if
the following guidelines are met:
• The exposed polymer (humidity sensor) is kept clean and undamaged.
• No-clean solder paste is used and the process is not exposed to any liquids, such as water or solvents.
• The peak soldering temperature does not exceed 260°C.

Can please precise point below?

- No rework ==> Does this mean that all soldering rework is prohibited and therefore component replacement is necessary? Or does the entire board have to be scrapped ?

- Can you also specify if there are specific hand soldering instructions? Except for the indication not to exceed 260°C

  • 0
    TI__Genius 12185 points

    Antoine,

    We don't have specific hand-soldering instructions, since hand soldering is much more likely to introduce chemical contaminations or damage to the sensor. 

    How was the hand soldering done in this case? Was it with a heat gun, and the brown spot is charring? Is that why you think the sensor is damaged? Have you observed any issues with this sensor's performance?

    Since this is a prototyping board, I would consider the rework rules to be much more relaxed. We just don't want rework to be done in production, and for customers to be very careful with removing the sensors if a customer return is necessary. If you are taking the sensor off the PCB, using a heat gun along with no-clean flux is fine. You do not need to scrap the PCB. If the component really was burned from high heat exposure, then yes it would need to be scrapped.

    Regards

    -Alex Thompson

  • 0 in reply to Alex Thompson
    Prodigy 10 points

    Thanks Alex,

    The component was actually mounted using a hot air generator. We were then alerted by our customer about this brown appearance, but I can't tell you if performance was affected. The component has already been replaced.

    Thanks for your precisions about reworking and hand soldering. This meets our demands.

  • 0 in reply to Antoine Angelo
    TI__Genius 12185 points

    Antoine,

    Happy to help. Let me know if you get more feedback from your customer on if this is a recurrent issue or they notice performance degradation.

    Thanks

    -Alex Thompson