Nexperia USA Inc. PDZ4.7BZ

Overview

PDZ4.7BZ 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 4.7 V (4.55–4.75 V at I_Z = 5 mA), ±2 % tolerance, 600 Ω dynamic impedance at 1 mA, and 2 µA reverse leakage at V_R = 1 V - deployed in power supply feedback loops, reference voltage generation, and overvoltage clamping circuits.

For engineers reviewing the PDZ4.7BZ datasheet, PDZ4.7BZ pinout, PDZ4.7BZ application, or PDZ4.7BZ equivalent, this device is selected for precision low-current regulation where thermal stability (−1.4 mV/K tempco), compact SOD323 packaging, and hard breakdown knee behavior are critical to maintaining stable reference integrity under varying load and temperature conditions.

Technical Context

The PDZ4.7BZ operates as a two-terminal voltage reference device with cathode-anode polarity, exhibiting a sharp, well-defined Zener breakdown at ~4.7 V with minimal voltage hysteresis. Its junction temperature range extends to +150 °C, and it maintains stable regulation down to 0.5 mA test current while delivering <2 µA reverse leakage at 1 V reverse bias.

Thermal performance is defined by R_th(j-sp) = 130 K/W (junction-to-solder point) and R_th(j-a) = 340 K/W (junction-to-ambient on FR4 PCB), enabling reliable operation up to 400 mW total power dissipation at T_amb ≤ 25 °C with linear derating above that ambient.

Key Specifications

Pinout & Package

PDZ4.7BZ is housed in a miniature 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. The package is optimized for reflow and wave soldering per IPC-7095 guidelines, using standardized solder land patterns.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584-C4V7 and MMBZ5225BS, PDZ4.7BZ offers the best balance of voltage accuracy, low-leakage operation, and thermal reliability in the 400 mW class - making it optimal for precision reference and low-power regulation where size and stability are jointly constrained.

Availability

PDZ4.7BZ is available at Aetrix Electronics and suitable for power supply feedback loops, microcontroller reset circuits, ESD protection clamps, and signal-level voltage limiters requiring stable component supply with full traceability and lifecycle support.

Supply support for PDZ4.7BZ 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 and logic devices, with leadership in automotive-qualified and industrial-grade components.

The PDZ-B series targets general-purpose, low-power voltage regulation in consumer, computing, and industrial electronics - engineered for manufacturability, thermal robustness in SMD assembly, and consistent parametric performance across wide ambient ranges.

FAQ

What is the maximum continuous reverse current the PDZ4.7BZ can handle at 25 °C?

The PDZ4.7BZ has no specified continuous reverse current rating; its operation is defined by Zener current I_Z. At 25 °C ambient, it supports up to 400 mW total power dissipation - corresponding to ~85 mA at 4.7 V. Derating applies above 25 °C per the published power curve.

How does the −1.4 mV/K temperature coefficient affect circuit performance?

A −1.4 mV/K coefficient means V_Z decreases by ~1.4 mV per degree Celsius rise in junction temperature. Over a 100 °C range (25–125 °C), this yields ~140 mV total drift - acceptable for non-critical references but requires compensation in high-precision applications.

Can PDZ4.7BZ be used in bidirectional TVS configurations?

No - PDZ4.7BZ is a unidirectional Zener diode. Its forward voltage (~0.9 V) and reverse Zener voltage (~4.7 V) are asymmetric. For bidirectional clamping, two PDZ4.7BZ devices must be connected anode-to-anode, or a dedicated bidirectional TVS like PESD5V0S1BA should be used.

Is the SOD323 package compatible with standard reflow profiles?

Yes - Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles. The SOD323 footprint shown in Figure 9 (0.6 mm pad width, 0.5 mm spacing) supports peak temperatures up to 260 °C for ≤30 seconds, with recommended preheat and soak zones to avoid thermal shock.