OPA607: Internal Thermal Shutdown

Hello Ray,

  The OPA607 does not have thermal protection. This means that the part will not shutdown or automatically alter amplifier functionality when it reaches a certain temperature.

  It is best to avoid violating the abs max rating for this device: 

  But, the OPAx607 does have a high allowable junction temperature up to a maximum of 150C.

Thank you,
Sima 

Hi Ray,

a thermal shutdown is something power OPAmps have, where high supply voltages and/or high output currents have to be handled which can easily result in a high heat dissipation and thermal overload. No standard OPAmp from TI does have such a thermal overload. Only the piezo driver DRV2700 has it, which is clear because it runs up to an boost voltage of 120V. And most of TI's power OPAmp have a thermal shutdown.

The OPA607, on the other hand, is a 5V OPAmp which provides an output short-circuit current limitation of 60mA. By this the heat dissipation is limited to 5V x 60mA = 0.3W which gives a rise of junction temperature of about 200°C/W x 0.3W = 60°C. And because the maximum junction temperature is 150°C, as Sima already mentioned, there is much thermal reserve and no need for a thermal shutdown

And if the OPA607 shall be used in an application where the output is frequently short-circuited under normal operation, a simple current limiting resistor at the output can furtherly limit the heat dissipation: A 100R current limiting resistor will limit the heat dissipation of OPA607 to below (2.5V)^2 / 100R = 62.5mW (maximum power when power matching) or a junction over-temperature of 13°C.

Kai