Hydrolyzes various disaccharides such as sucrose, maltose, and isomaltose with different efficiencies. Also hydrolyzes longer maltodextrins from maltotriose up to maltohexaose, but not maltoheptaose, palatinose, isomaltotriose, or isomaltotetraose. Hydrolysis of (1->6)-alpha-D-glucosidic linkages in some oligosaccharides produced from starch and glycogen by alpha-amylase, and in isomaltose. Optimum temperature is 42 degrees Celsius. Belongs to the glycosyl hydrolase 13 family.