MA43900H (MAZ4390-0H) 39 to 41 Volts zener diode in a DO-4390 case by Panasonic Download Panasonic MA4000 / MAZ400 series zener diode datasheet: Status: NOS (New Old Stock) RoHS: no NB banding : orange / white with a red band on the Cathode lead indicating a ranking of "H"