The OSB5SA57E1A is an optosupply component manufactured by OptoSupply Inc. It is a 5.0V Surface Mount AC/DC Electronic Load Module, with an input voltage range of 4.75 - 5.25V. It has a load current range of 0-2A and a peak current of 4A. The E1A is designed to be used in various applications such as automotive, consumer, industrial, battery chargers and more. The product features an internal protection circuit to ensure stability and protection against over voltage, over current, and over temperature. The module dimensions are 2 x 6mm.