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Original question:

SN54HC541: Datasheet Thermal Resistance Value increased from Revision D to Revision E

SN54HC240: Datasheet Thermal Resistance Value increased from Revision E to Revision F

Shinichi Inoue
Guru 19931 points
Part Number: SN54HC240
Other Parts Discussed in Thread: SN74HC240

Dear Specialists,

My customer is using SN74HC240 and has a question.

I would be grateful if you could advise.

According to the Datasheet, thermal resistance is increased Revision E to Revision F.

Could it possible to think the process of obtaining thermals has improved, the thermal performance for this device is the same, not improved.

I appreciate your great help in advance.

Best regards,

Shinichi

  • +1
    TI__Expert 5611 points

    Hi Shinichi,

    Similar to my last post during a routine datasheet update, this device’s thermal values (RΘJA, RΘJC(top), RΘJC(bot), RΘJB, ψJT, ψJB), as described in the Thermal Information Table, were updated to be more accurate.  TI now uses an improved thermal model to calculate thermal impedance values, and these new thermal values may differ slightly from the existing values in the datasheet.  The materials used, manufacturing process, and device core have not changed, so electrical performance will remain the same.  Only the thermal characteristics of the datasheet have been updated.

    Regards,

    Owen

  • 0 in reply to Owen Westfall
    Guru 19931 points

    Hi Owen,

    Thank you for your reply.

    I understand SN74HC240 has no changes in electrical characteristics, materials, or processes, only the thermal model has been changed.

    The thermal data is more accurate.

    I’ll share this information with the customer. 

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi