UT137EL-5 UT137EL-5 TO-220 UT137EL-5-TA3-T UT137EL-5-TN3-R UT137EL-6 UT137EL-6 TO-220 UT137EL-6-TA3-T UT137EL-6-TN3-R UT137EL-8 UT137EL-8 TO-220