SN74AHC1G08: Allowable Power Dissipation / SN74AHC1G08/14/32

Yuta Ishii

Prodigy 605 points

Part Number: SN74AHC1G08

Hi Team,

Could you check allowable power dissipation of the 3 device below?

・SN74AHC1G08DCKR

・SN74AHC1G14DCKR

・SN74AHC1G32DCKR

Thanks for your support!

Best regards, Yuta Ishii

over 4 years ago

0 Clemens Ladisch over 4 years ago

Guru 317250 points

(T_Jmax − T_Amax) / R_θJA = (150 °C − 125 °C) / 252 °C/W = 99 mW

(or 87 mW for the OR gate)

0 Emrys Maier over 4 years ago

TI__Guru* 97046 points

Hi Ishii-san,

Clemens is correct in his calculation, but I wanted to mention that he's only considering the worst case (which is generally the best practice).

If your maximum ambient operating temperature is less than 125C, then you can use that value instead and end up with more margin for maximum power consumption.

Logic

Logic forum

SN74AHC1G08: Allowable Power Dissipation / SN74AHC1G08/14/32