SN74CBTLV3257: SN74CBTLV3257 for Maximum power dissipation

Lawrence He

Genius 3115 points

Part Number: SN74CBTLV3257

Hi, Support Team

about SN74CBTLV3257PW for Maximum power dissipation is PD=(Tjmax-Ta)/theta JA=1.12W

is correct?

if any suggestion, Please advise me.

Thanks

Best regards,

Lawrence

0 Rami Mooti1 over 2 years ago

Hey Lawrence,

This formula is correct but I don't get the same values you get when I use it. That being said, the max power dissipation will depend on a number of things and will give you a more reliable number when you take into consideration the current going through the switches themselves. If we assume worst case switch current through all your switches, I'm getting a value closer to 327mW.
We have a good junction temp and power dissipation calculator at the bottom of this FAQ

(+) [FAQ] How to Calculate the Max Junction Temperature of an Analog Switch/Multiplexer. - Switches & multiplexers forum - Switches & multiplexers - TI E2E support forums

Hope it helps!
Thanks,
Rami