The OSCF4L5111A is an Optoisolator from Optosupply, which is a 4-channel, high speed, single-mode optocoupler. This device incorporates four independent light emitting diodes and photo-MOSFETs combined into one low-profile package. It is ideal for AC and DC cross-channel isolation applications, which requires signal transmission between two different parts of a circuit, either AC or DC. With its fast response time of 20ns, it helps provide short switching times for signal transmission. This product is available in 24-pin DIP package and its construction is suitable for high voltage up to 5 KV peak.