BUY TLP621 https://www.utsource.net/itm/p/158406.html
Optocoupler - Transistor Output, 1 CHANNEL TRANSISTOR OUTPUT OPTOCOUPLER, PLASTIC, 11-5B2, DIP-4
Description: TLP621 is an optocoupler manufactured by Toshiba America Electronic Components. It is a 4-pin DIP package containing an infrared light emitting diode (LED) and a phototransistor. Features: High speed response High isolation voltage Low input current Low output saturation voltage High reliability High CMR (Common Mode Rejection) Applications: TLP621 is used in a variety of applications, such as motor control, power supplies, telecommunications, and industrial automation. It can be used to provide electrical isolation between two circuits, as well as to detect the presence of an input signal. (For reference only)