SN74CB3Q3306A: Power Consumption & Thermal Metric

Evan Wang

Part Number: SN74CB3Q3306A
Other Parts Discussed in Thread: OPA2170

HI All,

May I know whether we have the Θjc or Ψjt of SN74CB3Q3306ADCUR?

https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/587788/sn74cb3q3306a-enquire-jc-spec-for-sn74cb3q3306apwr/2160191#2160191

And I found this post before and it seems that the Θja will change with test condition accordingly.

So do we have a confirmed Θja for reference?

And I would also like to know how to evaluate the power loss when the IC is operating.

Thank you.

over 2 years ago

0 Bryan Marshall over 2 years ago

TI__Genius 10974 points

Hello,

While we do not list these parameters for this device and package in this datasheet, these package parameters will be very similar or equivalent across difference devices with the same package type. For example, I would advise to take a look at the OPA2170 in the DCU package and use those as reference parameters for the package parameters you are interested in.

https://www.ti.com/lit/ds/symlink/opa4170.pdf?ts=1629836140134&ref_url=https%253A%252F%252Fwww.google.com%252F

For calculating the power loss for our devices, you can refer to this guide to calculate what that would look like:

https://e2e.ti.com/support/logic-group/logic/f/logic-forum/875721/faq-how-do-i-calculate-power-consumption-or-current-consumption-for-my-cmos-logic-device

Let me know if you have any other questions on this!

Thanks!

Bryan

0 Evan Wang over 2 years ago in reply to Bryan Marshall

TI__Expert 4710 points

Hi Bryan,

Thank you for the information.
May I know what the Cpd of SN74CB3Q3306A is?

0 Bryan Marshall over 2 years ago in reply to Evan Wang

TI__Genius 10974 points

Hello,

See below for parameters needed to calculate Cpd as it is not provided in this datasheet:

Note that it is advised to take some of these measurements from the lab to get a more precise estimation as it does depend on the board capacitance, ICC during operation, and input/output frequency ratio which will most likely be close to 1, but will be dictated by board parasitics.