Nexperia USA Inc. PDZ33B-QF

Overview

PDZ33B-QF from Nexperia is a single Zener diode designed for precision voltage regulation in low-power automotive and industrial circuits, with a nominal Zener voltage of 33.0 V (min 32.15 V, max 33.79 V at I_Z = 5 mA), ±2 % tolerance, 400 mW total power dissipation, and qualified to AEC-Q101 for under-hood applications.

For engineers reviewing the PDZ33B-QF datasheet, PDZ33B-QF pinout, PDZ33B-QF application, or PDZ33B-QF equivalent, this device is selected for stable reference generation in power supply feedback loops, overvoltage clamping in sensor interfaces, and ESD-robust voltage limiting in automotive body control modules where SOD323 footprint and hard breakdown knee are critical.

Technical Context

This Zener diode operates in reverse-bias breakdown mode with a typical differential resistance of 250 Ω at I_Z = 0.5 mA and 40 Ω at I_Z = 5 mA, enabling tight regulation under light-load conditions. Its temperature coefficient is +29.7 mV/K at I_Z = 5 mA, indicating positive thermal drift optimized for mid-to-high voltage stabilization.

The device features a hard breakdown knee and very low leakage current (<0.05 µA at V_R = 25 V), ensuring predictable turn-on behavior and minimal standby power loss. It is packaged in SOD323 (SC-76) with cathode marked by a bar, supporting automated optical inspection and high-density PCB layouts.

Key Specifications

Pinout & Package

PDZ33B-QF is housed in a SOD323 (SC-76) surface-mount plastic package measuring 1.8 mm × 1.35 mm × 0.95 mm, with gull-wing leads and cathode identified by a marking bar on the package top.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C33 and MMSZ5256ET1G, PDZ33B-QF delivers superior automotive qualification, tighter voltage tolerance, lower dynamic impedance, and better thermal resistance-making it the preferred choice for safety-critical 33 V regulation where reliability and precision are non-negotiable.

Availability

PDZ33B-QF is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, power supply feedback loops, and ESD-protected IO interfaces requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for PDZ33B-QF 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 essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET devices with emphasis on automotive and industrial reliability.

PDZ33B-QF belongs to the PDZ-B-Q series of AEC-Q101-qualified Zener diodes engineered specifically for robust voltage regulation in harsh automotive environments, including engine control, lighting, and body electronics.

FAQ

What is the maximum continuous reverse current the PDZ33B-QF can sustain at 25 °C?

The PDZ33B-QF does not specify a maximum continuous reverse current rating; instead, its safe operating limit is defined by power dissipation. At ambient ≤25 °C on a standard FR4 PCB, it sustains up to 400 mW, corresponding to ~12.1 mA at 33 V. Derating applies above 25 °C per the published power derating curve.

Is the PDZ33B-QF compatible with lead-free reflow soldering profiles?

Yes, PDZ33B-QF is qualified for lead-free reflow soldering per JEDEC J-STD-020. The recommended peak temperature is 260 °C with a maximum time above 217 °C of 60–150 seconds, matching standard Pb-free profile requirements for SOD323 packages.

How does the temperature coefficient affect regulation accuracy over −40 °C to +125 °C?

At I_Z = 5 mA, PDZ33B-QF has a temperature coefficient of +29.7 mV/K. Over a 165 K range, this yields ~4.9 V drift, but actual system variation is reduced by thermal coupling to PCB copper and operating current shifts-typical design margin accounts for ±1.5 V total drift in automotive applications.

Can PDZ33B-QF be used in parallel for higher power handling?

No-Zener diodes exhibit negative temperature coefficients below ~5 V and positive above, but even within the same batch, minor V_Z mismatches cause current hogging. Parallel operation is not recommended; for higher power, use a single higher-rated device or active regulation with a transistor buffer.