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LM139AQML: Pb free soldering

user5163865
Genius 3335 points
Part Number: LM139AQML

Hi,

Our customer has a question about soldering.


LM139AWG/833 is not RoHS compliant and the Lead finish is snpb.
Is it possible to use Pb-free solder for this product?
I checked the reliability data but it was unknown.

Best regards,

Hiroshi

  • 0
    TI__Mastermind 23425 points

    Hitoshi-san

    I haven’t encountered that before, so I’ll consult with the packaging experts and get back to you hopefully tomorrow. 

    Chuck

  • 0
    TI__Mastermind 49966 points

    Hello Hiroshi,

    It is not recommended. Summarized from our packaging expert:

    The SnPb melting point is 183°C,  while the Pb-Free is 217-220°C.

    The reflow profile for SnPb usually peaks at 210°C, and the Pb-Free reflow profile peak at 240°C.

    Running SnPb part with Pb-free profile would definitely overheat the SnPb solder, and cause them to heat and cool at different temperatures.

    The SnPb will be separated from the InterMetallic Compound, forming a weak joint that can affect solder joint reliability and strength.

    Also, the SnPb lead packages are specified for the 210°C profile, which may overheat or stress the device.

    So it may be possible for non-critical, non-stressed environments (such as stationary room temp consumer apps), we would not recommend it for Hi-Rel applications.

  • 0 in reply to Paul Grohe
    Genius 3335 points

    Hi,

    Thank you for the detailed information.

    Best  regards,

    Hiroshi