Adjustable voltage regulator 3 terminal national semiconductor lm338t buy adjustable voltage regulator 3 terminal 5a to 220 lm338t incorporating the following features adjustable output voltage 12v to 37v output voltage single output 5a output current 0c to 125c to 220 case the lm138 series of adjustable 3 terminal positive voltage regulator is capable of supplying in excess of 5a current limit constant with temperature typical applications includes adjustable power supplies