BZX384-B3V3,115 High-Precision 3.3V Zener Diode (±2% Tolerance, SOD-323)

Ensure highly accurate voltage references and localized overvoltage protection for your 3.3V microcontroller circuits with the BZX384-B3V3,115 Zener diode from Nexperia. While standard Zener diodes often feature wide ±5% voltage tolerances, the B3V3 variant belongs to the high-precision B-tolerance series, offering a tight ±2% voltage window. This makes it an ideal component for sensitive analog-to-digital converter (ADC) voltage baselines, precision sensor biasing, and low-drift voltage clamping.

Modern development platforms like the ESP32, STM32, and Raspberry Pi Pico operate strictly on 3.3V logic and can be permanently damaged by higher voltage signals. Placing this precision Zener diode across GPIO or ADC input pins provides an effective safety net, clamping stray voltage spikes safely to ground. Housed in the compact, industry-standard SOD-323 surface-mount package, it provides excellent thermal performance and reliability for high-density DIY electronics and professional IoT designs.

Key Features:

• High Precision (±2% Tolerance): Tight B-grade tolerance ensures an exact 3.3V baseline for critical ADC reference and analog biasing applications.

• 3.3V Logic Protection: Protects sensitive 3.3V microcontroller inputs from overvoltage transients and stray signals.

• 300mW Power Dissipation: Provides robust thermal handling in a small surface-mount form factor.

• Compact SOD-323 Package: Minimizes PCB space requirements while remaining easy to solder and inspect.

Specifications:

• Part Number: BZX384-B3V3,115

• Diode Type: Precision Zener Diode

• Nominal Zener Voltage ($V_Z$): 3.3V

• Voltage Tolerance: ±2% (B-Grade)

• Power Dissipation ($P_{tot}$): 300mW

• Package Type: SOD-323 (SMD/SMT)