Nexperia USA Inc. PZU84-B4V3R

Overview

PZU84-B4V3R from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and overvoltage protection in low-power analog circuits. It delivers a nominal 4.3 V Zener voltage at 5 mA, with differential resistance of 90 Ω (IZ = 5 mA), leakage current ≤3 μA at VR = 1 V, and forward voltage ≤0.9 V at IF = 10 mA - used in power supply feedback loops and sensor biasing networks.

For engineers reviewing the PZU84-B4V3R datasheet, PZU84-B4V3R pinout, PZU84-B4V3R application, or PZU84-B4V3R equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance at low regulation current, thermal resistance (Rth(j-a) = 500 K/W), reverse leakage behavior, and SOT23 footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its cathode-anode terminals under varying load and input conditions. Its hard breakdown knee and low leakage (<3 μA at VR = 1 V) support accurate reference generation in battery-powered instrumentation and low-noise signal conditioning stages.

The device is optimized for operation at IZ = 5 mA, where it achieves 90 Ω differential resistance and temperature coefficient of −3.5 mV/K. Its thermal resistance from junction to ambient (500 K/W) and maximum junction temperature (150 °C) define safe continuous power dissipation limits in FR4 PCB environments.

Key Specifications

Pinout & Package

Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), optimized for automated assembly and thermal performance on FR4 PCBs with single-sided 70 μm copper.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C4V3 and MMSZ4V3T1G, PZU84-B4V3R provides tighter ±2 % tolerance, lower leakage (≤3 μA vs. ≥5 μA), and superior thermal performance (500 K/W vs. ≥625 K/W), making it optimal for precision reference and space-constrained industrial designs.

Availability

PZU84-B4V3R is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C protection circuits, and low-power IoT reference designs requiring stable component supply with guaranteed long-term continuity.

Supply support for PZU84-B4V3R 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 high-volume, high-reliability discrete and logic devices, serving automotive, industrial, and consumer markets with scalable manufacturing and rigorous quality control.

The PZU84 series belongs to Nexperia's general-purpose Zener regulator portfolio, engineered for stable voltage reference and overvoltage protection in space-constrained, thermally demanding applications using SOT23 packaging.

FAQ

What is the maximum continuous reverse power dissipation for PZU84-B4V3R?

The maximum continuous reverse power dissipation is 250 mW at Tamb = 25 °C on a standard FR4 PCB with single-sided 70 μm copper. Derating is required above 25 °C ambient, following the 500 K/W thermal resistance curve. This limit assumes no airflow and standard solder pad layout per Figure 10.

Does PZU84-B4V3R have a connected pin 2, and what happens if it's soldered?

No - pin 2 is explicitly marked "n.c." (not connected) in the official pinning diagram and internal construction. Soldering or routing to pin 2 introduces no electrical function but risks mechanical stress or solder bridging; it must remain electrically and physically isolated per Nexperia's mounting guidelines.

How does the temperature coefficient affect regulation accuracy over −40 °C to +125 °C?

At nominal 4.3 V, the temperature coefficient is −3.5 mV/K. Over a 165 K span, this yields up to ±287 mV drift (≈±6.7 %). For high-accuracy applications, this must be compensated via circuit design or paired with temperature-stable references - the device itself is not compensated.

Can PZU84-B4V3R be used in forward conduction mode as a regular diode?

Yes - its forward voltage is ≤0.9 V at 10 mA, matching typical silicon diodes. However, it lacks specified fast-recovery or surge-current ratings; use is limited to low-speed, low-current clamping or polarity protection where Zener-specific parameters are irrelevant.