The Vishay Siliconix SUB60N04-15LT, temperature sensing MOSFET, provides the capabilities to sense the junction temperature, TJ, and implement self-protection in a control circuit. An electrically isolated poly-silicon diode, which is located in the close proximity to MOSFET junction on the same die, facilitates temperature sensing. The forward voltage drop of sense diode has a negative temperature co-efficient of approximately -2mV/_C. In other words, the forward voltage drop of the sense diode is inversely proportional to the MOSFET junction temperature.