BUY QFBR-2478 https://www.utsource.net/itm/p/1906956.html

QFBR-2478 is a DIP-8 optocoupler manufactured by Fairchild Semiconductor. It is a 4-channel digital isolator that provides electrical isolation between two circuits. It is designed to transfer digital signals between two circuits while providing a high degree of electrical isolation. The optocoupler features a high common-mode transient immunity of up to 25 kV/μs, a wide operating temperature range of -40°C to +125°C, and a low propagation delay of 1.5 μs. It is suitable for applications such as motor control, industrial automation, and medical systems. (For reference only)