Nexperia USA Inc. PZU84-B43R

Overview

PZU84-B43R from Nexperia is a ±2 % tolerance Zener voltage regulator diode with nominal 43 V breakdown voltage, optimized for low-leakage precision regulation in SOT23 package. It delivers 375 Ω differential resistance at 2 mA, −0.05 mV/K temperature coefficient, and 40 pF capacitance at 1 MHz, supporting stable reference generation in power supply feedback loops and overvoltage protection circuits.

For engineers reviewing the PZU84-B43R datasheet, PZU84-B43R pinout, PZU84-B43R application, or PZU84-B43R equivalent, this page provides verified pin mapping, real-world regulation performance data, thermal resistance values (Rth(j-a) = 500 K/W), leakage current behavior (≤0.05 μA at VR = 40 V), and direct alternatives with documented parameter-level differences.

Technical Context

This Zener diode operates in reverse-bias breakdown mode to maintain a stable 43 V reference across varying load and line conditions. Its hard breakdown knee and low dynamic impedance ensure minimal voltage deviation under transient current changes up to 200 mA forward/peak reverse surge capability.

Designed for surface-mount use on FR4 PCBs with standard SOT23 footprint, it features intentional low leakage (≤0.05 μA at VR = 40 V) and exhibits predictable temperature drift (−0.05 mV/K) - critical for high-accuracy analog sensing and feedback control where thermal stability directly impacts system gain error.

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 standard FR4 PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PZU84-B43R, BZX84-C43 and MMSZ43ET1G offer lower-cost alternatives but sacrifice ±2 % tolerance, higher differential resistance, and elevated leakage - making them unsuitable for precision feedback or ultra-low-power biasing where PZU84-B43R's 375 Ω r_dif and ≤0.05 μA leakage deliver measurable system-level accuracy and efficiency gains.

Availability

PZU84-B43R is available at Aetrix Electronics and suitable for power supply feedback regulation, overvoltage protection clamp, and reference voltage source applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for PZU84-B43R 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 logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The PZU84 series belongs to Nexperia's general-purpose Zener regulator portfolio, engineered specifically for stable voltage reference and clamping in space-constrained SMT applications where precision, low leakage, and thermal robustness are essential.

FAQ

What is the maximum continuous reverse current the PZU84-B43R can sustain without degradation?

The PZU84-B43R is rated for 200 mA maximum forward current, but its continuous reverse (Zener) current depends on thermal management. At 25 °C ambient on standard FR4 PCB, it sustains up to 5.8 mA continuously (250 mW ÷ 43 V) before reaching thermal limits. Derating is required above 25 °C per R_th(j-a) = 500 K/W.

Does the 'n.c.' pin require PCB routing or grounding?

No - Pin 2 is internally not connected and must remain electrically floating. Routing traces to or placing solder mask openings on this pad violates the specified SOT23 footprint and may cause mechanical stress or solder bridging. The official Nexperia reflow footprint (Fig. 10) excludes any copper or paste on Pin 2.

How does the temperature coefficient of −0.05 mV/K affect regulation accuracy over temperature?

At 43 V nominal Zener voltage, a −0.05 mV/K coefficient results in −4.25 mV drift over a 85 °C rise (from 25 °C to 110 °C junction), representing just 0.01 % of V_Z. This ultra-low drift enables sub-0.1 % total regulation error in well-designed thermal environments, outperforming typical ±5 % Zeners by >5× in thermal stability.

Can PZU84-B43R replace older PZM43xx series Zeners in existing designs?

Yes - PZU84-B43R shares identical SOT23 package dimensions, pinout (anode/cathode/n.c.), and electrical ratings (250 mW, 43 V, 200 mA) with PZM43xx devices. Its improved 375 Ω r_dif and ≤0.05 μA leakage provide superior regulation accuracy and lower standby loss, making it a direct functional and mechanical upgrade without layout changes.