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RK3399DatasheetRev https://cloud.mail.ru/public/LWuX/om7PwBKuq

3.2 Recommended Operating Conditions

Ambient Operating Temperature 80°C
Notes:
1)Symbol name is same as the pin name in the IO descriptions
2)with the reference software setup, the reference software will limit the chipset temperature about 80°C

Chapter 4Thermal Management 4.1
OverviewFor reliability and operability concerns, the absolute maximum junction temperature has to be below 125°C

3. 1Absolute Maximum Ratings
Storage Temperature Tstg 125°C
Max Conjunction Temperature Tj 125°C

Absolute maximum ratings specify the values beyond which the device may be damaged permanently. Long-term exposure to absolute maximum ratings conditions may affect device reliability.

3.2 Recommended Operating Conditions
Ambient Operating Temperature Ta
minimum 0°C, typical 25°C, maximum 80°C