Vishay, IL300-X009T AC/DC Input Photodiode Output Optocoupler, Surface Mount, 8-Pin SMD

The Vishay linear optocoupler consists of an AlGaAs IRLED irradiating an isolated feedback and an output PIN photodiode in a bifurcated arrangement. The feedback photodiode captures a percentage of the LEDs flux and generates a control signal (IP1) that can be used to servo the LED drive current. This technique compensates for the LEDs non-linear, time, and temperature characteristics. The output PIN photodiode produces an output signal (IP2) that is linearly related to the servo optical flux created by the LED.

It has high gain stability and wide bandwidth
It couples AC and DC signals