TLP240/241A MOSFET Output Optocouplers Toshiba TLP240/TLP241A MOSFET Output Optocouplers consist of a photo MOSFET optically coupled to an infrared LED. The TLP240/TLP241A optocouplers have an isolation voltage of 5000Vrms and are an ideal choice for devices that require reinforced insulation. These optocouplers are housed in a 4-pin DIP package.