• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 30 subscribers
  • Views 207 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Relative Humidity Data (TI Parts in general)

Dana Monemi1
Prodigy 20 points

Apologies if this is the wrong forum for this question.  Perhaps, if it is, one of the mods could move to another forum or just point me to another forum.

My question is how I can find Relative Humidity data for TI parts.  I cannot find any in the individual data sheets.  I have done text searches on ...

humidity

RH

R.H.

moisture

… and cannot find anything.  Sometimes, though, this kind of information is offloaded to other documents.

Can anyone point me in the right direction?

Thanks!

  • 0
    TI__Guru 71526 points

    Hello Dana, 

      In general, humidity is not a factor in IC operation.  However, it is certainly a concern during the assembly process and is designated by the MSL rating.  You can find this rating for any device using the MSL search tool: http://www.ti.com/packaging/docs/mslsearch.tsp  . 

    This AppNote describes the affects of humidity, and gives guidelines, during the reflow process:    http://www.ti.com/lit/an/spraby1a/spraby1a.pdf .

    You can also refer to the Quality Guidelines Handbook: http://www.ti.com/support-quality/quality-policies-procedures/guidelines.html .

    If these references do not provide the information you are requesting, please submit a request through our Customer Support Center: https://ticsc.service-now.com/csm  .

    At your service,

    ~Leonard  

     

  • 0 in reply to LeonardEllis
    Prodigy 20 points

    Leonard,

    Thanks for the informative reply.  I will take a look at the links you posted.

    When you say that "in general, humidity is not a factor in IC operation" do you mean that ICs mounted to PCBs can perform perfectly

    well in high RH environments (85%+) for extended periods of time?

    I have to admit I am pretty ignorant on this topic.

  • 0 in reply to Dana Monemi1
    TI__Guru* 91206 points

    Dana - 

    if i may jump in here and add some light - I am in the temp and humidity sensing group here at TI and i spent many months at sea doing corrosion control (I assume this is the sort of environment you are operating in) on avionics/electronics in a previous role, not at TI. 85%RH environments (usually) require conformal coating on the PCB or some type of protection on the enclosure (i.e. NEMA style enclosure) or both - its not just the ICs that need protection from the corrosion that results from that environment - connectors, etc also need regular maintenance for this reason, too - as i said, in my previous role - we did corrosion control inspections every 7 to 14 days, to keep our equipment in top shape.