NXP BZV55-C5V6 Zener Diode: Key Specifications and Application Circuits

The NXP BZV55-C5V6 is a popular Zener diode designed for voltage regulation and protection in a wide range of electronic circuits. As part of the BZV55 series, this component is known for its precise voltage regulation at a nominal Zener voltage of 5.6 V, making it a reliable choice for stabilizing and clipping signals in low-power applications. Housed in a compact SOD-80 (Mini MELF) package, it is suitable for use on PCBs where space is limited.

Key Electrical Specifications:

Nominal Zener Voltage (VZ): 5.6 V (@ IZT = 5 mA)

Power Dissipation (Ptot): 500 mW

Test Current (IZT): 5 mA

Maximum Reverse Leakage Current (IR): 100 nA (@ VR = 3 V)

Dynamic Impedance (ZZT): 60 Ω (@ IZT = 5 mA)

Temperature Coefficient: Typically +5 mV/°C

Primary Application Circuits:

1. Simple Voltage Regulator: The most common use of the BZV55-C5V6 is in a basic shunt voltage regulator circuit. It is placed in parallel with the load to maintain a constant output voltage of 5.6V, effectively clamping any excess voltage and protecting sensitive components from overvoltage conditions.

2. Overvoltage Protection: It serves as an effective and inexpensive protection device. When placed at the input of a sensitive IC, it clamps any transient voltage spikes above its 5.6V threshold, diverting harmful current away from the protected component.

3. Signal Clipping and Waveform Shaping: In audio or signal processing circuits, two Zener diodes can be arranged in a bidirectional clipping configuration. The BZV55-C5V6 is ideal for clipping AC signal waveforms at precisely ±5.6V, converting sine waves into rough square waves or limiting amplitude.

Design Considerations:

When implementing this diode, the current-limiting series resistor (RS) is critical. Its value must be calculated to ensure the Zener current (IZ) stays within its operational range (between the knee current and the maximum current determined by Ptot / VZ) under all input voltage and load conditions. Proper calculation prevents overheating and ensures stable regulation.

ICGOOODFIND: The NXP BZV55-C5V6 is a fundamental component for low-power voltage regulation and circuit protection. Its key advantages are its precise 5.6V breakdown voltage, compact size, and reliability. Engineers and hobbyists frequently select it for its effectiveness in simple shunt regulators, overvoltage protection clamps, and signal conditioning circuits, providing essential stability and safety for electronic designs.

Keywords: Zener Diode, Voltage Regulation, Overvoltage Protection, Signal Clipping, 5.6V