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  • Resolved

LM239: Tj(max) specification change

Expert 2430 points
Mochi

Replies: 4

Views: 145

Part Number: LM239

Hello,

Our customer has been using LM239 at high ambient temperature EE.

Recently Tj(max) specification is changed from 105degC to 85degC in SLCS006U datasheet.

They care about offset(max) value which was 15mV over Full range, it was -25 to 105degC.

But now, offset is 15mV at -25 to 85degC, seems de-graded offset performance very much.

Is this true understanding that “new production lot” device has larger offset than previous device at 85degC?

Or, actually offset performance is same as “previous lot” device but just changed Tj(max) specification on datasheet?

Regards,

Mochizuki

Expert 2430 points
Mochi
  • Mastermind 31595 points
    Paul Grohe
    Hello Mochi,

    The temperature range for the LM239 did NOT change. It has always been -25 to +85°C.

    There was a mistake in the front-page Description text that was fixed in datasheet Revision U.

    The Recommended Operating table has always stated -25 to 85C.

    There have been NO changes to the LM239 device, specifications or test system limits. So if the device was suitable for use in the past, it will still continue to be suitable.

    Also, there is a competitor device that has their LM239 specified up to +105C, and customers make the assumption that all LM239's have this temp range. This has come up quite often...

    Regards,

    Paul Grohe

    TI Comparators (CMPS) Applications Group

  • Expert 2430 points
    Mochi

    In reply to Paul Grohe:

    Hi Paul-san,

    Thank you for your prompt reply.

     

    Okay, this correction is just in "front page" section , not in "Recommended operating condition" section.

    Then it is clear that no change of actual device performance.

    So, we should not heat up about this subject even it is simple and confusing typo :-)

     

    Regards,

    Mochizuki

  • Genius 13750 points
    Chuck Sins

    In reply to Mochi:

    Mochizuki-san
    Thanks for your understanding. I am going to close this thread but if you need any further support, feel free to hit reply or open a new thread.
    Chuck
  • Expert 2430 points
    Mochi

    In reply to Chuck Sins:

    Paul-san,

    Thank you for your support.

    We will visit our customer this week to explain this fact.

    Regards,

    Mochizuki

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