MMSZ5226BT1G 3.3V Surface Mount Zener Diode (500mW, SOD-123)

Protect your fragile 3.3V microcontrollers from accidental overvoltage with the MMSZ5226BT1G surface-mount Zener diode. Modern logic boards, such as the Raspberry Pi, ESP32, and STM32, operate strictly on 3.3V logic. If you accidentally connect a legacy 5V sensor, UART adapter, or relay module to these pins, the 5V signal can permanently destroy the processor. By placing this 3.3V Zener diode between the input pin and ground, it acts as an ultra-fast voltage clamp, safely dumping any excess voltage above 3.3V to ground and saving your expensive hardware.

Beyond logic-level protection, this diode is an excellent precision voltage reference for Analog-to-Digital Converters (ADCs) and custom low-power regulator circuits. Capable of dissipating up to 500mW of power, it is incredibly robust for its size. Housed in the industry-standard SOD-123 surface-mount package, it requires virtually zero PCB space, making it a mandatory safety component for any maker designing compact IoT sensors, drone flight controllers, or mixed-voltage DIY electronics.

Key Features:

• Logic Level Clamping: The absolute best way to protect delicate 3.3V GPIO pins from destructive 5V signals and voltage spikes.

• Precision Voltage Reference: Provides a stable 3.3V baseline, perfect for biasing analog sensors and comparator circuits.

• High Power Capacity: Safely dissipates up to 500mW (0.5W) of power, offering robust overvoltage clamping in a microscopic form factor.

• Space-Saving SOD-123: The miniature surface-mount package is highly optimized for automated assembly and densely packed custom PCBs.

Specifications:

• Part Number: MMSZ5226BT1G

• Diode Type: Zener Diode

• Zener Voltage (Vz): 3.3V (Typical)

• Power Dissipation (Pd): 500mW

• Tolerance: ±5%

• Package Type: SOD-123 (SMD/SMT)