The TOSHIBA TLP3131 Mini-flat photorelay is a small-outline photorelay, suitable for surface-mount assembly. The TLP3131 consists of a GaAs infrared-emitting diode optically coupled to a photo-MOS FET and housed in a 4-pin package. The TLP3131 features low CR multiplication and especially low On-state resistance, allowing high ON-state current. Its characteristics also include low OFF-state current and low output pin capacitance, enabling it to be used in high-frequency measuring instruments.