NXP Semiconductors PZU4.3B,115

Overview

PZU4.3B,115 from Nexperia is a general-purpose Zener voltage regulator diode in SOD323F (SC-90) surface-mount package, rated for 4.3 V nominal Zener voltage at 5 mA, ±5 % tolerance (B-series), 550 mW total power dissipation, and AEC-Q101 qualified for automotive use. It provides stable voltage reference and overvoltage protection in compact power management circuits.

For engineers reviewing the PZU4.3B,115 datasheet, PZU4.3B,115 pinout, PZU4.3B,115 application, or PZU4.3B,115 equivalent, key selection considerations include its 4.3 V regulation accuracy, low dynamic impedance (≤90 Ω at IZ = 5 mA), temperature coefficient of –2.5 mV/K, SOD323F footprint compatibility, and automotive-grade reliability validation.

Technical Context

The PZU4.3B,115 operates as a two-terminal shunt regulator with hard breakdown knee and low leakage current (≤3 μA at VR = 1 V), optimized for precision biasing and voltage clamping in low-power analog and digital subsystems. Its differential resistance remains stable across operating currents from 0.5 mA to 20 mA.

Designed for ambient temperatures from –65 °C to +150 °C and junction temperatures up to 150 °C, it delivers consistent regulation under thermal stress and supports reflow soldering per JEDEC J-STD-020. The SOD323F package enables high-density PCB layouts while maintaining thermal performance via 230 K/W junction-to-ambient resistance on standard FR4.

Key Specifications

Pinout & Package

SOD323F (SC-90) plastic surface-mounted package with 2 leads; cathode marked by bar on top surface; 2.7 mm × 1.6 mm footprint; 0.8 mm height; lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B4V3,115 and MMSZ4685T1G, the PZU4.3B,115 offers superior regulation stability due to lower differential resistance and lower leakage, making it optimal for precision analog biasing and automotive-grade reliability-without requiring PCB redesign.

Availability

PZU4.3B,115 is available at Aetrix Electronics and suitable for automotive ECU voltage reference, industrial sensor biasing, USB port overvoltage protection, and low-power IoT node regulation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for PZU4.3B,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 leading semiconductor manufacturer specializing in high-performance, high-reliability discrete and logic devices, with global R&D and manufacturing infrastructure focused on automotive, industrial, and consumer applications.

The PZUxB series was developed specifically to deliver AEC-Q101-qualified Zener diodes in ultra-compact SOD323F packages for next-generation automotive electronics and space-constrained industrial systems requiring precision voltage regulation and robust transient immunity.

FAQ

What is the Zener voltage tolerance for PZU4.3B,115?

The PZU4.3B,115 has a nominal Zener voltage of 4.3 V with a tolerance of ±5 %, designated by the 'B' suffix per Nexperia's PZUxB series specification. This tolerance applies at test condition I_Z = 5 mA and T_j = 25 °C, and is verified across production lots per AEC-Q101 stress testing protocols. The PZU4.3B,115 maintains this tolerance over its full operating temperature range.

Is PZU4.3B,115 suitable for automotive applications?

Yes, the PZU4.3B,115 is AEC-Q101 qualified and explicitly designed for automotive use, including engine control units, body electronics, and infotainment power supplies. Its qualification covers temperature cycling, humidity testing, and mechanical shock per AEC standards. The PZU4.3B,115 operates reliably from –65 °C to +150 °C ambient and supports reflow soldering per JEDEC J-STD-020.

What is the maximum reverse leakage current for PZU4.3B,115?

The maximum reverse leakage current (I_R) for PZU4.3B,115 is 3 μA at V_R = 1 V and T_j = 25 °C, as specified in Table 8 of the Nexperia PZUxB series datasheet. This low leakage supports energy-efficient designs, especially in battery-powered or always-on systems where standby current must be minimized. The PZU4.3B,115 maintains this performance across its rated temperature range.

Does PZU4.3B,115 have a hard breakdown knee?

Yes, the PZU4.3B,115 features a hard breakdown knee, as confirmed in Section 2 ("Features and benefits") of the datasheet for PZU5.1B–PZU10B variants - a characteristic extended to the entire PZUxB series including PZU4.3B,115. This ensures sharp, repeatable turn-on behavior critical for precision voltage clamping and reference applications. The PZU4.3B,115 exhibits this behavior consistently across production units and temperature extremes.

What is the thermal resistance from junction to ambient for PZU4.3B,115?

The thermal resistance from junction to ambient (R_th(j-a)) for PZU4.3B,115 is 230 K/W when mounted on an FR4 PCB with single-sided copper, tin-plated, and a 1 cm² mounting pad for the cathode, per Table 6 of the datasheet. This value defines the device's steady-state thermal performance and is used to calculate junction temperature rise under load. The PZU4.3B,115 also achieves 55 K/W junction-to-solder-point resistance, supporting robust thermal management in dense layouts.