SN75DPHY440SS: SN75DPHY440SSRHRR – Question about Calculating Ta and Tc

Also, could you please provide the maximum power consumption of SN75DPHY440SSRHRR for reference?

RθJA=42.1°C/W，power under normal operation for 4 data lanes + clock.NOM=150mW，Tj=105°C， calculation of Ta=98°C /Tc=100°C 

Is the calculation of Ta and Tc correct?

Avery

It is important to understand, in any case, that the critical factor affecting device reliability and functionality is the junction temperature, not the ambient temperature.

Please see this app note, https://www.ti.com/lit/an/spra953d/spra953d.pdf, in particular section 5.1 on how to calculate the junction temperature. 

The DPHY440 max junction temperature is 105C and DPHY440 will continue to operate as long as you do not violate its max junction temperature.

Thanks

David

Hi David

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SNx5DPHY440SS MIPI® CSI-2/DSI DPHY Retimer datasheet (Rev. D)

5.1 Absolute Maximum Ratings  <--Is this it?

If this is the document, could you please confirm whether the maximum power consumption of the SN75DPHY440SSRHRR is 150mW?

Thanks

Avery

Avery

I apologize for the broken link, here is the correct link, https://www.ti.com/lit/an/spra953d/spra953d.pdf.

150mW is the max power consumption for the DPHY440.

Thanks

David

Hi David

Thank you for your answer.

I have one more question: approximately how far from the device should the air temperature be measured to represent Ta?

Avery

For Ta measurement, I would point you to this app note, https://www.ti.com/lit/an/snoa966b/snoa966b.pdf.

Thanks

David