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PCA9548A: Storage Temperature and Operating Temperatures

Maher Khazendar
Prodigy 10 points
Part Number: PCA9548A

Hi,

I’m having some difficulty identifying some Mil Spec.  components for some IC’s !

I noticed that there are what is called Storage Temperature for some of these parts. So the question I have:

what will happen if  the Component is exposed to higher temperatures greater than the Operating Temperatures and less than the  Storage Temperatures ?

for example for P/N PCA9548ADB  the  Storage temperature is defined to be  -65°C ~ 150°C  and the  Operating free-air Temperature  is defined to be -40°C ~ 80°C

What will happen to P/N PCA9548ADB if I put the CCA inside a heat Chamber after powering up the CCA at temperatures higher or lower than the operating temperatures

but are within the Storage temperature example :

Run the CCA @ -50°C 

Or run the CCA @ 125°C

Regards

  • 0
    TI__Mastermind 47948 points

    Hi Maher,

    Maher Khazendar said:
    what will happen if  the Component is exposed to higher temperatures greater than the Operating Temperatures and less than the  Storage Temperatures ?

    The absolute maximum rating for storage temperature can be found in section 6.1 of the datasheet on page 5. Going above this temperature >150C could potentially cause permanent damage to the IC, and the device may not function properly after violating the spec. 

    The max and min operating temperature is listed in section 6.3 underneath the section "recommend operating conditions" on page 5 as well. 

    Violating these temperature specs simply implies that the electrical specifications are no longer guaranteed if you decide to operate the IC below or above the min/max recommended operating conditions. It may or may not cause permanent damage to the device. Permanent damage to the IC is more closely determine by the abs. maximum conditions in the datasheet. 

    Maher Khazendar said:

    What will happen to P/N PCA9548ADB if I put the CCA inside a heat Chamber after powering up the CCA at temperatures higher or lower than the operating temperatures

    but are within the Storage temperature example :

    Run the CCA @ -50°C 

    Or run the CCA @ 125°C

    PCA9548ADB inside the heat chamber without power is applying the storage temperature spec. As long as the ambient temperature is not below or above the absolute max conditions in the datasheet for storage temperature, you are guaranteed that no permanent damage occurred to the device. 

    If you operate PCA device at a temperature above/below the max/min specs in the rec. operating conditions, then the electrical specifications are not guaranteed by the device. 

    i.e. operating (meaning powering the device) at -50C or 125C would violate the rec. operating conditions, and therefore electrical specs are no longer guaranteed. 

    ANOTHER thing to keep in mind is that the maximum ICC current through the device should not exceed -100mA to 100mA. This is found in the abs. max conditions. 

    Adding excessive ambient heat as well as operating the device max cause a significant rise in ICC, IO, II abs. max specs which could potentially cause permanent damage to the device if these specs are violated. Please be sure that the temperature you are testing the PCA device at is not causing the current to rise/fall above/below the min/max specs of the device. Otherwise, permanent IC damage could occur. 

    Regards,

    Tyler