The JANTX1N3030B-1 from Microchip Technology is through hole mounting zener diode with 27 V nominal zener voltage, ±5% tolerance, 1 W power and 35 Ohms max impedance. This diode has 1.2 V forward (Vf) (Max) @ 200 mA If and comes in DO-204AL, DO-41, Axial package. Operating temperature range is from -55°C to 175°C.