The hybrid IC is not extinct. Hybrids can be tuned to give superior specifications, especially in drift over temperature and noise that cannot be reached with a high volume monolithic device.
Apex Microtechnology took its hybrid Op Amp performance to more than double the output voltage of any previous designs. The PA-99 is targeted for power supplies and test equipment suppliers especially in the GaN and SiC Power device arena.
The age old, tried and true cascaded topology, in the output drive circuitry that has served many an operational amplifier design, is still a reliable architecture that operates at 2,500V supply with more than 2,400V output capability. The IC is able to operate with symmetric or asymmetric power supplies with the only condition being the voltage between the positive and negative supply rails not exceed the maximum supply voltage spec.
As for the output current, the PA99 provides a minimum of 20 mA continuously and as high as 50 mA peak. (Of course any power amplifier must be operated within its Safe Operating Area.) External resistors set the output current limit in order to prevent excess current from damaging the amplifier or the load. The output can source or sink current as well and drive any type of resistive, capacitive, or inductive loads.
The addition of a temperature monitoring diode adds an order of protection to the die in the hybrid as well, which improves the lifetime of the ICs on board. Slew rates of 25 to 35V/us are achievable at this high voltage as well.
Designers were aware that customers want as small a footprint as possible, especially when multiple devices are used in test equipment. A hermetic Power-DIP package filled with inert gas helps reduce the required package height and makes for better spacing of the internal components. A 12-pin Power-DIP package was able to be used for a small footprint.
For more detail visit the Apex Microtechnology website.