41.3.6 Thermal Characteristics

Table 41-6.
Standard Operating Conditions (unless otherwise stated)
Param. No.	Sym.	Characteristic	Typ.	Units	Conditions
TH01	θ_JA	Thermal Resistance Junction to Ambient	60	°C/W	28-pin SPDIP package
			56.72	°C/W	28-pin SOIC package
			57.3	°C/W	28-pin SSOP package
			39.1	°C/W	28-pin VQFN
			47.2	°C/W	40-pin PDIP package
			27.5	°C/W	40-pin QFN package
			40.3	°C/W	44-pin TQFP package
TH02	T_JMAX	Maximum Junction Temperature	150	°C
TH03	PD	Power Dissipation	—	W	PD = P_INTERNAL+P_I/O
TH04	P_INTERNAL	Internal Power Dissipation	—	W	P_INTERNAL = I_DD x V_DD⁽¹⁾
TH05	P_I/O	I/O Power Dissipation	—	W	P_I/O = Σ(I_OLV_OL)+Σ(I_OH(V_DD-V_OH))
TH06	P_DER	Derated Power	—	W	P_DER = PD_MAX (T_J-T_A)/θ_JA⁽²⁾
Note: I_DD is current to run the chip alone without driving any load on the output pins. T_A = Ambient Temperature, T_J = Junction Temperature.