ABLIC Inc. IC REG CTRLR BUCK SOT23-5 S-8521E42MC-BMBT2U

The S-8521E42MC-BMBT2U is a product model that likely corresponds to a specific electronic device or component. Unfortunately, without further context or information about the manufacturer or industry it belongs to, it's impossible to provide detailed specifications or features of this model. However, typically a product code like this would include information such as product type, size, capacity, version, etc.