The Vishay Dale TZX30C-TR is a small signal Zener diode with a nominal voltage of 30V and a power dissipation of 500mW. It comes in a DO-35 axial package.
The Vishay Dale TZX30A-TAP is a small signal Zener diode with a nominal voltage of 30V and a power dissipation of 500mW. It comes in a DO-35 axial package.