The 1N5357B is a Zener Diode with cathode band polarity.
Zener Diode, 5 Watt ±5% Tolerance Features: Zener Voltage: 3.3V to 200V High Surge Current Capability
The 1N5333B series Surmetic™ Voltage Regulator Zener Diode with tight limits and better operating characteristics that reflect the superior capabilities of silicon-oxide passivated junctions. All this in an axial lead, transfer-moulded plastic package that offers protection in all common environmental conditions. All external surfaces are corrosion-resistant and leads are readily solderable.