TOSHIBA Photocoupler IRED + Photo IC TLP751 TLP751 Digital Logic Ground Isolation Line Receiver Microprocessor System Interfaces Switching Power Supply Feedback Control Analog Signal Isolation The TOSHIBA TLP751 consists of a high output infrared emitting diode and a high speed detector of one chip photo diode transistor. This unit is 8 lead DIP. TLP751 has internal base connection. This base pin should be used for analog application or enable operation. If base pin is.