Nexperia USA Inc. PZU4.3B2A,115

Overview

PZU4.3B2A,115 from Nexperia is a precision Zener voltage regulator diode in SOD323 (SC-76) package, designed for low-power voltage reference and overvoltage protection in space-constrained PCBs. It delivers 4.3 V nominal Zener voltage with ±2 % tolerance, 90 Ω maximum differential resistance at 5 mA, and 3 nA reverse current at 0.5 mA test condition - enabling stable regulation in bias networks and analog sensor interfaces.

For engineers reviewing the PZU4.3B2A,115 datasheet, PZU4.3B2A,115 pinout, PZU4.3B2A,115 application, or PZU4.3B2A,115 equivalent, key selection criteria include Zener voltage accuracy, low leakage at sub-mA bias, thermal resistance to ambient (390 K/W), and compatibility with reflow-soldered SMD layouts on FR4 boards.

Technical Context

This Zener diode operates in reverse breakdown mode with hard knee characteristics, optimized for low-current regulation (IZ = 0.5–5 mA). Its temperature coefficient is –2.5 mV/K at 25 °C, minimizing drift across industrial temperature ranges (–55 °C to +150 °C).

The device features intentional low dynamic impedance (≤90 Ω) and ultra-low IR (≤3 nA @ VR = 3.4 V), supporting noise-sensitive applications such as ADC reference stabilization and op-amp feedback networks where leakage-induced offset must be minimized.

Key Specifications

Pinout & Package

SOD323 (SC-76) plastic surface-mount package with cathode-marked top-side bar; 2-terminal configuration optimized for minimal PCB footprint and thermal performance on single-sided FR4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B4V3,115 and MMSZ4V3T1G, PZU4.3B2A,115 uniquely combines ±2 % tolerance, sub-5 nA leakage, and SOD323 size - making it optimal for miniaturized, low-drift analog subsystems where both precision and space are constrained.

Availability

PZU4.3B2A,115 is available at Aetrix Electronics and suitable for voltage reference design, analog signal conditioning, and overvoltage protection requiring stable component supply in high-volume consumer, industrial, and automotive-qualified (non-safety-critical) programs.

Supply support for PZU4.3B2A,115 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, with manufacturing rooted in process control and automotive-grade quality systems.

The PZUxBA series belongs to Nexperia's general-purpose Zener regulator portfolio, engineered specifically for space-efficient, low-leakage voltage referencing in portable and thermally constrained applications - not intended for automotive safety systems.

FAQ

What is the maximum reverse voltage this diode can withstand before breakdown?

The PZU4.3B2A,115 has a nominal Zener voltage of 4.3 V with guaranteed breakdown between 4.28 V and 4.48 V at 5 mA test current. It is not rated for sustained reverse voltage above its specified V_Z; operation beyond 4.48 V risks exceeding its 320 mW power limit unless current is strictly limited by external series resistance.

Can this Zener diode replace a 4.3 V bandgap reference IC?

It can replace bandgap ICs only in non-critical applications where ±2 % initial accuracy, –2.5 mV/K temperature coefficient, and no buffered output are acceptable. Unlike bandgap ICs, it provides no current drive capability or low-output-impedance source - external op-amp buffering is required for driving loads >100 µA.

How does the B2 tolerance grade differ from B1 or B3 in the PZUxBA series?

B2 denotes ±2 % tolerance at 5 mA, positioned between B1 (tighter ±2 % with tighter binning) and B3 (same ±2 % but with enhanced low-current stability). For PZU4.3B2A,115, B2 guarantees 4.28–4.48 V at 5 mA and is optimized for balanced cost-performance in general-purpose regulation - distinct from B3's focus on fast-switching noise reduction.

Is this device suitable for automotive applications?

No - PZU4.3B2A,115 is not AEC-Q200 qualified and lacks automotive-specific testing or qualification documentation. While its operating temperature range (–55 °C to +150 °C) overlaps with automotive ambient requirements, Nexperia explicitly states non-automotive qualification for this series; use only in non-safety-critical, non-automotive systems unless independently validated.