The ACPL-054L-500E is a high speed optocoupler manufactured by Broadcom. It is a small, 4-pin optocoupler package that operates up to 1MBd. The ACPL-054L-500E can be used to isolate digital signals up to 1MBd frequency when a higher data rate is needed in a minimal space. It is designed with a combination of an AlGaAs LED and integrated high-gain photo detector, allowing high speed and noise immunity. It offers robust, photo-isolated, relay-replacement interfacing between two independent circuits. It is commonly used in telecom, industrial, and audio applications.