Zener Diode (3.3V) 0.5W 5pcs

The Zener Diode (3.3V) 0.5W is a through-hole zener diode with a zener voltage of 3.3 V and a power rating of 0.5 W, sold in a pack of 5. Used in reverse bias with a series resistor, it holds the voltage across it close to 3.3 V, which is handy for simple reference voltages and for protecting 3.3 V inputs on ESP32, ESP8266 and Raspberry Pi boards.

Zener Diode (3.3V) 0.5W Specifications

• Zener voltage: 3.3 V
• Power rating: 0.5 W (500 mW)
• Maximum zener current: about 150 mA in theory (0.5 W ÷ 3.3 V); keep well below this
• Mounting: through-hole, axial leads
• Polarity: the band marks the cathode
• Pack size: 5 pieces

Zener Diode (3.3V) 0.5W Applications

• Simple 3.3 V voltage references
• Clamping and protecting 3.3 V microcontroller inputs
• Basic shunt regulators for low-current loads
• Overvoltage protection on sensor and signal lines
• Learning how zener diodes work in electronics classes

What's in the Box

• 5 × 3.3 V 0.5 W zener diodes

Tip: Connect the cathode (banded end) towards the positive side and always use a series resistor to limit the current. For example, from 5 V with about 10 mA through the zener, use roughly (5 − 3.3) ÷ 0.01 ≈ 170 Ω, so a 180 Ω resistor is a good choice.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.