NXP BZX384-B56: A Comprehensive Technical Overview of the 56V Zener Diode

The NXP BZX384-B56 is a precision Zener diode engineered to provide a stable and reliable 56V nominal Zener voltage. As a critical component in voltage regulation and protection circuits, this device exemplifies the blend of performance and robustness required in modern electronic design. Part of the popular BZX384 series, the -B56 variant is specifically characterized by its tight voltage tolerance and excellent temperature stability, making it a preferred choice for applications demanding high precision.

Housed in a hermetically sealed SOD-27 (DO-35) glass package, the diode offers proven reliability and is suitable for a wide range of environmental conditions. The glass construction not only provides mechanical protection but also allows for efficient heat dissipation and is ideal for automated assembly processes. The device is designed for general-purpose voltage regulation and transient suppression in various electronic circuits.

A key parameter of any Zener diode is its Zener voltage, denoted as V_Z. For the BZX384-B56, this is specified at 56V with a tight tolerance of ±5% when measured at a test current (I_ZT) of 5 mA. This ensures designers can count on a predictable and consistent reference or clamping voltage. The device's ability to maintain this voltage is further reinforced by its low dynamic impedance, typically around 60 Ohm, which means the voltage remains stable even with variations in the current flowing through the diode.

The power dissipation capability is another vital aspect. The diode can handle a maximum power dissipation of 500 mW at an ambient temperature of 50°C. This rating dictates the maximum current the diode can conduct without damage, calculated as I_max = P_tot / V_Z. For the 56V variant, this equates to approximately 9 mA. For operation at higher temperatures, a derating factor of 3.2 mW/°C must be applied above 50°C.

The BZX384-B56 operates effectively over a wide junction temperature range from -65°C to +200°C, ensuring performance stability in demanding environments. Its primary function is to maintain a constant voltage across its terminals when operated in the reverse breakdown region. This makes it indispensable for:

Voltage Regulation: Providing a stable reference voltage in power supplies and analog circuits.

Overvoltage Protection: Shunting excessive voltage transients away from sensitive ICs to protect them from damage.

Waveform Clipping: Modifying AC waveforms in signal processing circuits.

ICGOOODFIND: The NXP BZX384-B56 is a highly reliable and precise 56V voltage regulator diode. Its hermetic glass package, tight voltage tolerance, and robust power handling make it an excellent and cost-effective solution for a multitude of circuit design needs, from consumer electronics to industrial systems.

Keywords: Zener Diode, Voltage Regulation, Overvoltage Protection, 56V, Hermetic Package.