The HFD3023-500-BBA-RS is direct coupled optical receiver designed for use in short distance 850 nm fiber optic systems. The receiver contains a monolithic IC (Integrated Circuit) with an integral photodiode and amplification circuit, and an open collector Schottky output. The output allows it to be directly interfaced with standard TTL (Transistor-Transistor Logic) circuits. The HFD3023-500 Series converts the optical signal in a pointto-point data communications fiber optic link to a TTL output.