Figure 10-2 shows the thermal shutdown behavior of a socketed OPA455 that internally dissipates 1 W. Unsoldered and in a socket, the R_θJA of the DDA package is typically 128°C/W. With the socket at 25°C, the output stage temperature rises to the shutdown temperature of 150°C, which triggers automatic thermal shutdown of the device. The device remains in thermal shutdown (output is in a high-impedance state) until it cools to 130°C where the device is again powered. This thermal protection hysteresis feature typically prevents the amplifier from leaving the safe operating area, even with a direct short from the output to ground or either supply. The absolute maximum specification is 150 V, and the OPA455 must not be allowed to exceed 150 V under any condition. Failure as a result of breakdown, caused by spiking currents into inductive loads (particularly with elevated supply voltage), is not prevented by the thermal protection architecture.