SN74CB3Q3384A: Thermal resistance

Hi Christian here is the data you are looking for 

PW  =37.6 °C/W

DBQ =41.3 °C/W

DGV  =39.6 °C/W

In addition here is a e2e thread that talks about the max junction temperature of this device.

https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1379483/sn74cb3q3384a-request-to-provide-junction-temp

Please let me know if you have any additional questions 

Regards,

Kameron