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SN74AUP3G14: Recommend Low-level output current in case of Vcc=3V

Hirotaka Matsumoto
Guru 27565 points
Part Number: SN74AUP3G14

Hi all

Would you mind if we ask SN74AUP3G14?

On the data sheet, Recommended Low-level output current in case of Vcc=3V is 4mA.
Our customer use 6mA(IOL) with Vcc=3.3V.
So, might it cause of thermal problem?

Kind regards,

Hirotaka Matsumoto

  • 0
    Guru 267600 points

    When you overload the output, the voltage drop becomes larger. So in the worst case, you get a voltage drop somewhat larger than the specified 0.45 V at 4 mA. (And in the typical case, you probably won't even go above 0.45 V).

    Anyway, even with a completely unrealistic voltage drop of 3 V on all three outputs, the power dissipation would be 3 × 3 V × 6 mA = 54 mW. In the DQE package, this would result in a temperature increase of 54 mW × 261 °C/W = 14.1 °C, which would be completely harmless.