What is the formula for the junction to ambient thermal resistance (θJA)?
θJA is defined by the following formula: θJA = θJC + θCA= (TJ – TA) / PD Where TJ is the junction temperature of the semiconductor device mounted inside the oscillator (measured in °C), TA is the ambient temperature outside the oscillator (measured in °C), and PD is the power dissipation of the oscillator (measured in Watts). Given the above equation, the θJA parameter is measured in units of degrees Celsius per Watt (°C/W).
