The On Semiconductor SZMMSZ33T3G is a 33V Zener diode in a SOD-123 package, offering 500mW of power dissipation. It is designed for voltage regulation.
The SZMMSZ33T1G is a 33V Zener diode from On Semiconductor with 500mW power dissipation and ±5% tolerance. It is housed in a surface mount SOD-123 package.