TLP621XBG is an optocoupler made by Isocom, which is a four channel photocoupler consisting of UV LED, an IC detector, and four MOSFETs. It is designed for devices that need to isolate and/or transfer digital signals up to 250VA. Its IC detector is a slotted optocoupler, which is suitable for high-speed logic applications. Each channel has an isolation voltage of 5000Vrms, a rise time of 0.8µs, and a maximum output voltage of 40V. TLP621XGB operates in standard temperature range between -40°C and 85°C. This part has a package of 6-pin DIP and is designed for surface mount applications.