Nexperia USA Inc. PDZ4.3BZ

Overview

PDZ4.3BZ from Nexperia is a single silicon Zener diode designed for low-power voltage regulation in space-constrained SMD applications, with a nominal Zener voltage of 4.3 V (4.17–4.48 V at I_Z = 5 mA), ±2 % tolerance, 600 Ω dynamic impedance at 1 mA, and 3 µA reverse leakage at V_R = 1 V - deployed in precision biasing and reference circuits for industrial sensors and power supply feedback loops.

For engineers reviewing the PDZ4.3BZ datasheet, PDZ4.3BZ pinout, PDZ4.3BZ application, or PDZ4.3BZ equivalent, this device is selected for stable low-current regulation where thermal resistance (R_th(j-a) = 340 K/W), compact SOD323 footprint, and hard breakdown knee are critical to maintaining accuracy under varying ambient conditions.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its cathode-anode terminals. Its 4.3 V nominal working voltage is specified at 5 mA test current, with temperature coefficient of −2.5 mV/K and differential resistance of 600 Ω at 1 mA - enabling predictable regulation in low-power analog front-ends.

The device uses planar epitaxial technology with metallization optimized for low leakage and sharp knee characteristics. It is rated for continuous power dissipation up to 400 mW at T_amb ≤ 25 °C on FR4 PCB, derating linearly above that temperature per Figure 1 in the datasheet.

Key Specifications

Pinout & Package

PDZ4.3BZ is housed in a SOD323 (SC-76) surface-mount plastic package measuring 1.8 × 1.35 × 0.95 mm, with cathode identified by a marking bar on the top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B4V3 and MMSZ4V3T1G, PDZ4.3BZ offers superior low-current regulation stability (600 Ω @ 1 mA), tighter ±2 % tolerance, and higher 400 mW power handling in the smaller SOD323 package - making it optimal for precision, space-constrained, and thermally demanding applications.

Availability

PDZ4.3BZ is available at Aetrix Electronics and suitable for industrial sensor biasing, USB port overvoltage clamping, and low-power microcontroller reset circuits requiring stable component supply with guaranteed long-term sourcing.

Supply support for PDZ4.3BZ 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, logic, and MOSFET solutions, headquartered in Nijmegen, Netherlands.

The PDZ-B series targets general-purpose, low-power voltage regulation in consumer, industrial, and computing applications - emphasizing compact size, tight tolerance, and consistent breakdown characteristics in SMD packages.

FAQ

What is the maximum continuous reverse current the PDZ4.3BZ can handle before degradation?

The PDZ4.3BZ has no defined maximum continuous reverse current rating; instead, its operation is limited by total power dissipation. At 4.3 V Zener voltage, the maximum sustainable reverse current is approximately 93 mA (400 mW ÷ 4.3 V), assuming ambient temperature remains at or below 25 °C on a standard FR4 PCB. Derating applies above that temperature per Figure 1.

How does the −2.5 mV/K temperature coefficient affect regulation accuracy over temperature?

A −2.5 mV/K coefficient means the Zener voltage decreases by 2.5 mV per Kelvin rise in junction temperature. Over a 100 K range (−40 °C to +60 °C), this results in a total drift of −250 mV - but since V_Z is 4.3 V, the relative error is ~5.8 %. This is acceptable for non-precision references but requires compensation in high-accuracy systems.

Can PDZ4.3BZ be used in forward conduction mode, and what is its typical forward voltage?

Yes - PDZ4.3BZ functions as a standard silicon diode in forward bias. Its forward voltage is 0.9 V at 10 mA and 1.1 V at 100 mA (pulse-tested), matching typical Si diode behavior. This allows dual-use in polarity protection or logic-level shifting where both Zener and forward conduction are needed.

Is the SOD323 package compatible with standard reflow soldering profiles for lead-free assembly?

Yes - Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles. The recommended reflow footprint (Figure 9) uses 0.6 mm wide solder lands with 0.5 mm spacing, and the device withstands peak temperatures up to 260 °C for ≤ 30 seconds, making it fully compatible with standard lead-free manufacturing processes.