41.3.6 Thermal Characteristics

Table 41-6. 
Standard Operating Conditions (unless otherwise stated)
Param. No.Sym.CharacteristicTyp.UnitsConditions
TH01θJAThermal Resistance Junction to Ambient70°C/W14-pin PDIP package
95.3°C/W14-pin SOIC package
100°C/W14-pin TSSOP package
51.5°C/W16-pin VQFN package
62.2°C/W20-pin PDIP package
77.7°C/W20-pin SOIC package
87.3°C/W20-pin SSOP package
40°C/W20-pin QFN package
TH02TJMAXMaximum Junction Temperature150°C
TH03PDPower Dissipation0.8WPD = PINTERNAL+PI/O
TH04PINTERNALInternal Power DissipationWPINTERNAL = IDD x VDD(1)
TH05PI/OI/O Power DissipationWPI/O = Σ(IOL*VOL)+Σ(IOH*(VDD-VOH))
TH06PDERDerated PowerWPDER = PDMAX (TJ-TA)/θJA(2)
Note:
  1. IDD is current to run the chip alone without driving any load on the output pins.
  2. TA = Ambient Temperature, TJ = Junction Temperature.