The TLP521-1GBSMT&R Optocoupler SMD–4 RoHS manufactured by Isocom is a high performance, high density optocoupler module. It consists of an infrared light emitting diode (LED) and a phototransistor detector optically coupled in one 4-pin miniature surface-mount package. Its compact size makes it ideal for applications that require the highest level of integration, performance, or minimum board space. Its innovative design makes it resistant to noise and crosstalk, resulting in superior isolation performance. The device is RoHS compliant and meets the requirements of most electronic applications.