Nexperia USA Inc. PZU12B2AZ

Overview

PZU12B2AZ from Nexperia is a precision Zener voltage regulator diode in SOD323 (SC-76) package, designed for stable voltage reference and overvoltage protection in low-power analog and digital circuits. It provides a nominal 12 V regulation at 5 mA with ±2 % tolerance (B2 series), 80 Ω maximum differential resistance, ≤10 nA reverse current at 0.5 mA, and a temperature coefficient of +9 mV/K - enabling accurate biasing in temperature-sensitive sensor interfaces and power supply feedback paths.

For engineers reviewing the PZU12B2AZ datasheet, PZU12B2AZ pinout, PZU12B2AZ application, or PZU12B2AZ equivalent, this page delivers verified electrical parameters, validated SOD323 terminal mapping, real-world use cases in voltage clamping and reference design, and technically grounded alternative part comparisons - all derived from Nexperia's official Rev. 4 product data sheet dated 16 August 2024.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable DC voltage across its terminals under varying load and temperature conditions. Its B2 tolerance grade ensures tight 11.74 V to 12.24 V regulation window at I_Z = 5 mA, and intentional leakage optimization supports fast transient response in noise-sensitive applications per AN90031.

The device exhibits a positive temperature coefficient (+9 mV/K) above 10 V, minimizing thermal drift in regulated supplies, and achieves 105 Ω typical thermal resistance from junction to solder point - critical for reliability in compact PCB layouts with limited copper area.

Key Specifications

Pinout & Package

Package: SOD323 (SC-76), plastic surface-mounted device measuring 1.7 mm × 1.25 mm × 0.95 mm with 1.3 mm lead pitch and cathode-marked top-side bar.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage regulation applications.

Compared with BZX384-B12 and MMSZ5242B, PZU12B2AZ offers the narrowest tolerance in SOD323, lowest leakage at sub-mA currents, and optimized transient response - making it preferred for precision, low-power, and space-constrained voltage reference roles.

Availability

PZU12B2AZ is available at Aetrix Electronics and suitable for voltage reference design, ESD protection layout, and sensor biasing applications requiring stable component supply, consistent Zener tolerance, and SOD323 footprint compatibility.

Supply support for PZU12B2AZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

PZUxBA series belongs to Nexperia's general-purpose Zener regulator portfolio, engineered specifically for stable voltage referencing and overvoltage clamping in space-constrained, low-power surface-mount applications.

FAQ

What is the exact Zener voltage range for PZU12B2AZ at 5 mA test current?

The PZU12B2AZ guarantees a Zener voltage between 11.74 V and 12.24 V when measured at I_Z = 5 mA and T_j = 25 °C, per Nexperia's Rev. 4 datasheet Table 8. This 0.5 V window reflects the ±2 % B2 tolerance grade and is validated across production lots without binning.

Can PZU12B2AZ be used in place of a 12 V Zener with ±5 % tolerance?

Yes, but only if the design requires tighter regulation: PZU12B2AZ's ±2 % tolerance provides a narrower 11.74–12.24 V window versus ±5 % parts (11.4–12.6 V). Its lower rdif and optimized leakage also improve stability in low-current references - however, no pin or thermal derating changes are needed for direct substitution.

What is the maximum continuous reverse current before thermal runaway occurs?

At T_amb = 25 °C on standard FR4 PCB, PZU12B2AZ must be limited to ≤26.7 mA continuous reverse current to stay within its 320 mW P_tot rating (12 V × 26.7 mA = 320 mW). Exceeding this risks junction temperature rise beyond 150 °C, especially with reduced copper area or elevated ambient.

Does the SOD323 package support automated optical inspection (AOI) after reflow?

Yes - the SOD323 outline (1.7 mm × 1.25 mm) and cathode marking bar are fully compatible with standard AOI systems. Nexperia's recommended reflow footprint (Fig. 10) ensures ≥75 % solder paste coverage and clear contrast for bar-code-style cathode detection, meeting IPC-A-610 Class 2 requirements.