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SN74LVC1G125: OP temp testing measure

Zhihong Huang
Intellectual 1550 points
Part Number: SN74LVC1G125

Hi team,

My customer want to know how the TI test the Operating free-air temperature when calibrating OP temp? How far is the air temperature to test from the chip body?

Best Regards

Wesley Huang

wesley-huang@ti.com

  • 0
    TI__Guru 62350 points

    Hi Wesley,

    The operational temp is -40 to 125C as noted by Clemens.

    the electrical parameters are characterized initially on bench and ATE test machines and during production the limits are guardbanded in a way it tests the temp range at 25C.

  • 0 in reply to ShreyasRao
    Guru 317460 points

    No hand-drawn red circle? Then it isn't from me.  ;-)

    Understanding and Interpreting Standard-Logic Data Sheets says:

    4.5.15 TA Operating Free-Air Temperature

    The range of operating temperatures over which the logic element is specified.

    […]

    More additional information on all the thermal metrics used for integrated circuit refer to the TI application report , Semiconductor and IC package Thermal Metrics ,SPRA953.

    SPRA953 does not mention "free-air temperature". The nearest is:

    7 Miscellaneous Definitions

    Ambient Air Temperature— Multiple sources list different locations for determining the ambient air temperature. NEBS specifies the air temperature coming into the system box as ambient. AEC specifies the air temperature under the device as the ambient. JEDEC specifies the air stream temperature in advance of the PCB. Sometimes the ambient air temperature is taken above the device as an understanding of ambient. Each of these measurement locations yields a different temperature for the ambient air temperature.

    So, which one does TI use?

  • 0 in reply to Clemens Ladisch
    TI__Genius 16735 points

    Hi Wesley,

    There is not a specific distance of the free-air operating temperature. Any ambient or external temperature that the device is exposed to can be considered the free-air operating temperature. As clemens as mentioned, there are different methods used to define ambient temperature but I would consider all the definitions to hold true for free-air operating temp. If the board, air under or around the device is above the recommended free-air operating temp, then you will have to choose another part that meets those requirements.

    Thanks!

    -Karan