Please see the theta JA and Psi JT parameters for the device S29GL064S70BFI040 (package: VBK048) below.
Theta JA: 39 C/W
Psi JT: 5 C/W
You can refer our application note "https://www.cypress.com/file/210756/download " to calculate the maximum junction temperature. Refer section "8. Calculating TJ in Ideal Conditions" on page 5.
Thanks and Regards,
Thank you Brusha. This is what I needed.