Nexperia USA Inc. PZU84-B3V3R

Overview

PZU84-B3V3R from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 package, providing precise 3.3 V regulation at 5 mA with 95 Ω differential resistance and ≤5 μA reverse leakage at VR = 3.3 V. It operates across −55 °C to +150 °C ambient, supports 250 mW steady-state dissipation, and is used for low-power reference and overvoltage protection in power management rails.

For engineers reviewing the PZU84-B3V3R datasheet, PZU84-B3V3R pinout, PZU84-B3V3R application, or PZU84-B3V3R equivalent, key selection criteria include Zener voltage tolerance (±2 %), low dynamic impedance at 5 mA, hard breakdown knee behavior, thermal resistance (330 K/W junction-to-solder point), and compatibility with FR4 PCB layouts using standard SOT23 reflow footprints.

Technical Context

This Zener diode belongs to the PZU84-B subseries optimized for stable regulation at low currents, featuring a sharp breakdown knee and very low leakage (≤5 μA at VR = 3.3 V). Its differential resistance of 95 Ω at IZ = 5 mA ensures minimal output voltage variation under load shifts.

The device uses silicon planar technology in a three-terminal SOT23 package with Pin 1 = anode, Pin 2 = not connected, Pin 3 = cathode. Thermal resistance from junction to solder point is 330 K/W, enabling reliable operation on standard FR4 boards without heatsinking at ≤250 mW continuous dissipation.

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), rated for reflow and wave soldering per IPC-7095 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C3V3 and MMSZ5226B, PZU84-B3V3R delivers superior low-current stability (95 Ω rdif at 5 mA vs. ≥90 Ω), tighter tolerance (±2 % vs. ±5 %), and lowest leakage (≤5 μA), making it optimal for battery-constrained, high-accuracy 3.3 V reference designs.

Availability

PZU84-B3V3R is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical devices, and telecom power supervisors requiring stable component supply with guaranteed long-term continuity.

Supply support for PZU84-B3V3R 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and robustness.

The PZU84 series targets general-purpose Zener regulation in space-constrained applications, emphasizing low-leakage performance, tight voltage tolerance, and SOT23 compatibility for modern PCB assembly.

FAQ

What is the maximum continuous forward current rating for PZU84-B3V3R?

The absolute maximum forward current is 200 mA per limiting values table. However, sustained forward conduction is not its intended use mode; the device is designed for reverse-bias Zener operation. Forward voltage is specified at 10 mA (VF ≤ 0.9 V), and exceeding 100 mA continuously risks thermal runaway due to low thermal resistance and lack of forward-safe operating area definition.

Can PZU84-B3V3R be used in place of a 3.3 V voltage reference IC?

Yes, in non-critical applications where ±2 % initial accuracy and −3.5 mV/K temperature coefficient are acceptable. Unlike bandgap references, it lacks curvature compensation and has higher tempco, so it suits cost-sensitive designs where 10–100 ppm/°C drift is tolerable-e.g., comparator thresholds-not precision DAC or ADC references requiring <10 ppm/°C stability.

Is Pin 2 truly unconnected, or does it serve a mechanical or thermal function?

Pin 2 is electrically unconnected (n.c.) per official pinning diagram and internal construction. It serves no electrical role and must remain floating on the PCB. While the leadframe may provide minor mechanical anchoring, no thermal path or signal coupling is defined-thermal resistance data assumes only Pins 1 and 3 are soldered, and Rth(j-sp) is measured at the cathode tab (Pin 3).

How does PZU84-B3V3R perform under transient surge conditions?

It withstands up to 40 W non-repetitive peak reverse power for 100 μs (square wave) at Tj = 25 °C prior to surge. This enables clamping of fast ESD events (e.g., IEC 61000-4-2 Level 4) when combined with series current limiting. Performance degrades above 100 μs pulse width or elevated junction temperature, as shown in Fig. 1's PZSM vs. tp curve.