The TOSHIBA mini flat photo relay TLP3111 is a small outline photo relay, suitable for surface mount assembly. The TLP3111 consists of a GaAs infrared emitting diode optically coupled to a photo-MOSFET in a 4 pin lead package (MFSOP6), and has characteristics of small off-state current and small output terminal capacitance, which enable the TLP3111 to be applied to measurement instruments.(especially to high-frequency measurements)