ATP-binding (A) component of a common energy-coupling factor (ECF) ABC-transporter complex. Unlike classic ABC transporters this ECF transporter provides the energy necessary to transport a number of different substrates including 5-formyltetrahydrofolate, pantothenate and riboflavin. Expression of the complex plus FolT in E.coli allows 5-formyltetrahydrofolate uptake; 5-formyltetrahydrofolate is not taken up in the absence of FolT or the EcfA1A2T complex. Forms a stable energy-coupling factor (ECF) transporter complex probably composed of 2 membrane-embedded substrate-binding proteins (S component), 2 ATP-binding proteins (A component) and 2 transmembrane proteins (T component). This complex interacts with a number of substrate-specific components, including FolT, PanT and RibU for 5-formyltetrahydrofolate, pantothenate and riboflavin respectively. Belongs to the ABC transporter superfamily. Energy-coupling factor EcfA family.