SN74LVC2G17: RθJc, Psi JT parameter

Taichi Iura

Part Number: SN74LVC2G17

Hi team,

I want to calculate the Tj of SN74LVC2G17DCK by Tj=Tc + (RθJc top x Pd ) or Tj=Tc + (Psi JT x Pd ), but I can find neither RθJc nor Psi JT on the datasheet.

Could you help to provide the information for us?

over 1 year ago

0 Albert Xu1 over 1 year ago

TI__Mastermind 26415 points

Hi Taichi,

Does this FAQ help you?:

[FAQ] What is the maximum junction temperature (TJMAX) for a device?

If you still want to calculate using RthetaJc and Psi JT, I will have to submit a thermal request for this device. This takes around 2 weeks to come back to me.

0 Taichi Iura over 1 year ago in reply to Albert Xu1

Prodigy 30 points

Hi Albert

Thank you for your reply and information.

According to this FAQ, to my understanding, it is needed to measure Ta for Tj presumption.
If Ta measurement point is known exactly, I would calculate Tj using Ta, RthetaJa and Pd.

But I think it is difficult to measure Ta around this device because the measurement point is unclear.

So I intend to attach a thermocouple to the top of the package and measure Tc.
In this case, I suppose RthetaJc or Psi JT are required.

Best regards,

Taichi

+1 Albert Xu1 over 1 year ago in reply to Taichi Iura

TI__Mastermind 26415 points

Hi,

I actually was able to these values from a request done before.

Result- Theta JA-High K (standard datasheet value)	217.3
Result-Theta JC, top (standard datasheet value)	152.7
Result-Theta JB (standard datasheet value)	61.6
Result- Psi JT (standard datasheet value)	43.7
Result- Psi JB (standard datasheet value)	61.3
Result-Theta JC, bottom (standard datasheet value)	n/a

0 Taichi Iura over 1 year ago in reply to Albert Xu1

Prodigy 30 points

Hi Albert,

Thank you for the information.
This is very helpful.

Best regards,

Taichi

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SN74LVC2G17: RθJc, Psi JT parameter