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LM2594: Solder Temperature Sensitivity

JP
Expert 3801 points
Part Number: LM2594

Hi Team,

My customer was reviewing the LM2594M-5.0, and they are trying to assess if the device is solder temperature sensitive. They had a few questions that I wanted to see if someone from the team can address: 

Per the TI datasheet, the D8 (SnPb finish) package option provides absolute maximum temperatures for vapor phase and IR reflow processes, and the MSL value for this package is 1.

Is there any concern for the D8 (SnPb) package being expose to 235C per TI’s AN-2029 Handling and Process Recommendations (refer to second screenshot)?

If there is not an issue of the D8 (SnPb) package being expose to the 235C temperature, then I would say for certain that it is not “Solder Temperature Sensitive”.

Regards,

JP

  • 0
    TI__Guru 73235 points

    Hello

    Let me speak with our product engineer and I will get back to you as soon as possible.

    Thanks

  • +1 in reply to Frank De Stasi
    TI__Guru 73235 points

    Hello

    Here is the response from our product expert:

    LM2594 is a SOIC (package designator D).

    The Sn plated version already marked in the datasheet as “Life Time” Buy.

    Customer should switch to RoHS version from the next order.

    Assuming customer has already bought the Sn version.

    We usually address the maximum temperature at the package body.

    The Sn version is classified as MSL1 with peak temp at 235C.

    That’s the temp we used to run the MSL qualification.

    The lead temperature usually will be higher than the body when power up.

    For this package, there is no issue to expose to 235C.

    Thanks