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SN74AHC1G09: Clarification on Max Junction Temperature

Jejomar Ildefonso
Expert 8890 points
Part Number: SN74AHC1G09

Hi Team,

We're aware that the max junction temperature for standard logic devices are the same as their max storage temperature, which is typically 150C as discussed on the FAQ: https://e2e.ti.com/support/logic-group/logic/f/logic-forum/716186/faq-what-is-the-maximum-junction-temperature-tjmax-for-a-device

However on SPRA953C app note (https://www.ti.com/lit/an/spra953c/spra953c.pdf), particularly on section 7 shows two absolute temperature limits: "Absolute Maximum Junction Temperature" and "Absolute Maximum Operating Temperature". As for the SN74AHC1G09 is concerned, which of these temperating ratings does the 150C max falls to?

We're specifically trying to figure out the maximum junction temperature at which the device functions electrically as 150C is the value we're interested in.


Kind Regards,

Jejomar

  • +1
    Guru 276980 points

    The limits in the recommended operating conditions table guarantee that the device will work correctly.
    The limits in the absolute maximum ratings table guarantee that the device will not be damaged.

    Within the limits of the datasheet, the maximum operating junction temperature can be computed as 125 °C + 252 °C/W × 0.55 V × 8 mA = 126.1 °C.