TOSHIBA Photocoupler IRLED & Photo-Transistor TLX9291A Various Controllers Signal transmission between different circuit potential HEV (Hybrid Electric Vehicle) and EV (Electric Vehicle) Applications TLX9291A Unit: mm The TOSHIBA TLX9291A mini-flat photocoupler is suitable for surface-mount assembly. The TLX9291A consists of an infrared LED optically coupled to a photo-transistor. This photocoupler can be used to the extensive applications. It is generic speed transistor output. Colle.