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MAX232E: MAX232E

Prem Kumar Kandan
Prodigy 10 points
Part Number: MAX232E

Tool/software:

We received this MAX232E from two different regions, Mexico and Malaysia.

At our testing Country of origin "Malaysia" PASS the ICT and Functional. 

Country of origin "Mexico" FAIL the ICT and Functional. 

 

Appreciate if you could review and share the difference between the two dies, so we can take action as needed to complete the ICT and FCT tests. This is urgent. It will be helpful if you could prioritize. 

  • 0
    TI__Guru 73491 points

    Prem,

    Do you have a schematic I could review? The new device shouldn't fail a functional test like loopback....

    Can you also provide what pins are failing the ICT, is it impedance or voltage, and the limits you have set for those tests.

    -Bobby

  • 0
    Prodigy 20 points

    Hi Bobby, 

    Based on your latest input from 9/22/2025 you mentioned that the 2 devices are functionally the same , but tthat these are different designs. Please elaborate on what the differences are and whether TI can supply the previous component that our CM was using. : 47AD4FK G4 MAX 232EI to replace Mexico stock : TI 4AAFKPM MAX232EI. please see a copy of what you mentioned on September 22, below : 

    Munir,

    The two devices are functionally the same. 

    The impedance differences come from the fact that the device's are different designs. Generally, the newer designs perform better than the older one because it uses modern day process technologies. 

    The most common customers reports of an "issue" is the CM's have something called an in-circuit test (ICT) which provide fail positives with the new designed dies. The CM's need to essentially change/update their limits on their ICTs for the newer die's difference in impedance levels. 

    -Bobby

  • 0 in reply to Munir Ben Sabeur
    TI__Guru 73491 points
    Munir Ben Sabeur said:
    Please elaborate on what the differences

    The differences are that the RS232 driver is stronger than the previous version. The datasheet typical of the old one is around 7V but actual data shows 6V for VoH for example. The new VoH is 9V which means the new version will provide better SNR margin and can support a longer distance due to the larger SNR. 

    The other major difference is the consumption current is much lower. The typical called out in the datasheet is 8mA, actual data shows around 6mA for the old design where the new design has 1.1mA.

    A minor difference is the IIS current is much lower on the new version.

    Basically every change mentioned is an improved compared to the old one. 

    Munir Ben Sabeur said:
    whether TI can supply the previous component that our CM was using

    This is done by a first come first serve basis. We need to work with our product marketing team offline to see if we have devices left. The old designs are being phased out and inventory for them may be gone. 

    You'll need to send me an email at duynguyen@ti.com to verify.

    -Bobby