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# SN74LV4051A: About Maximum power dissipation

Part Number: SN74LV4051A
Other Parts Discussed in Thread: TMUX1308-Q1, TMUX1208, TMUX1108, SN74LVC2G32

Hi,

Could you tell me about SN74LV4051APWR power dissipation spec?
Customers are considering replacing Renesas with TI.
However, TI's logic products do not have power dissipation listed.
Could you tell us the power dissipation specifications at 25℃?

Regards,
Yusuke

• Hi Yusuke,

Thanks for posting to E2E. This is a frequently asked question, as switch data sheets may not include this spec. Take a look at this E2E FAQ post that walks through how to calculate max power dissipation:

This post includes a link to an excel sheet calculator: 6683.Signal Switch power dissipation and junction temperature calculator.xlsx

As you can tell from the calculator, you can calculate the max power dissipation using the following specs:

• Recommended Vcc (max)
• Icc (max current consumption)
• I(I/O) (max I/O continuous current)
• # of channels (for this device, enter "1", as only one signal path is ON at a time)
• Ron (max ON resistance)

Use the equation to find max power dissipation:

Pmax = (Vcc * Icc) + (channel# * (I(I/O))^2 * Ron)

The Pmax for SN74LV4051A is about 562.5 mW.

What is your application? If you are looking for an 8:1 multiplexer, I suggest checking out TMUX1308-Q1, TMUX1208, or TMUX1108, depending on your system requirements.

Let me know if you have any additional questions!

Best regards,
Kate

• Hi kate,

Thank you for your kind support.
I understood how to calculate power dissipation of the multiplexer.

How should other logic ICs estimate it?
ex) SN74LVC2G32

Rds(ON) is not described for logic devices.
If so, how should it be calculated?

Regards,
Yusuke

• Hi Yusuke,

If you have a question for a logic device, I encourage you to search for the answer in the E2E Logic forum or open a new thread there. This ensures that the proper team for this device can give you the best answer!

Best regards,
Kate