Nexperia USA Inc. PDZ9.1B-QZ

Overview

PDZ9.1B-QZ from Nexperia is a single Zener diode designed for precision voltage regulation in low-power circuits, with a nominal Zener voltage of 9.1 V (8.85–9.23 V at I_Z = 5 mA), ±2 % tolerance, 60 Ω maximum differential resistance at 5 mA, and qualified to AEC-Q101 for automotive use in SOD323 (SC-76) surface-mount package.

For engineers reviewing the PDZ9.1B-QZ datasheet, PDZ9.1B-QZ pinout, PDZ9.1B-QZ application, or PDZ9.1B-QZ equivalent, this device supports stable reference generation in power supply feedback loops, overvoltage clamping in sensor interfaces, and ESD-robust voltage limiting in automotive body control modules where compact size and thermal reliability are critical.

Technical Context

This Zener diode operates as a two-terminal shunt voltage regulator, maintaining a stable reverse-biased breakdown voltage across its cathode-anode terminals under controlled current conditions. Its hard breakdown knee and low leakage (<0.5 µA at V_R = 7.3 V) enable accurate clamping without significant parasitic conduction in standby states.

Thermal performance is defined by R_th(j-sp) = 130 K/W (junction-to-solder point) and R_th(j-a) = 340 K/W on FR4 PCB, supporting continuous operation up to T_j = +150 °C. The device's temperature coefficient of +5.5 mV/K at I_Z = 5 mA indicates positive drift - critical for biasing stability in temperature-varying environments.

Key Specifications

Pinout & Package

PDZ9.1B-QZ uses the SOD323 (SC-76) plastic surface-mount package: 1.7 mm × 1.3 mm footprint, 0.95 mm height, cathode marked by a 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 BZX584C9V1 and MMSZ5240B, PDZ9.1B-QZ delivers tighter voltage tolerance, lower dynamic impedance, and guaranteed automotive reliability - making it the optimal choice for safety-critical or thermally constrained designs where regulation accuracy and long-term stability are non-negotiable.

Availability

PDZ9.1B-QZ is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, USB-C power delivery protection, and consumer IoT battery monitoring requiring stable component supply across production lifecycles.

Supply support for PDZ9.1B-QZ 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 specializing in high-performance, reliable discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.

PDZ9.1B-QZ belongs to the PDZ-B-Q series of AEC-Q101-qualified Zener diodes engineered specifically for robust voltage regulation in automotive electronics and industrial systems demanding precision, low leakage, and thermal resilience.

FAQ

What is the maximum continuous reverse current the PDZ9.1B-QZ can handle without degradation?

The PDZ9.1B-QZ has a maximum non-repetitive peak reverse current (I_ZSM) of 3.5 A for 100 µs square-wave pulses at 25 °C ambient. For continuous operation, the device must remain within its 400 mW total power dissipation limit - corresponding to ~44 mA at 9.1 V - to avoid exceeding T_j = +150 °C under standard FR4 mounting conditions.

How does the +5.5 mV/K temperature coefficient affect circuit performance in automotive under-hood environments?

A +5.5 mV/K coefficient means V_Z increases by approximately 55 mV over a 10 °C rise - e.g., from 9.10 V at 25 °C to 9.155 V at 35 °C. This positive drift improves stability in feedback loops where reference drift opposes op-amp offset drift, but requires compensation in high-accuracy references spanning −40 °C to +125 °C operating ranges.

Can PDZ9.1B-QZ be used in parallel for higher power dissipation?

No - Zener diodes exhibit negative temperature coefficients at low voltages and positive ones above ~5.6 V, but manufacturing tolerances cause unequal current sharing. Parallel connection risks thermal runaway even among same-type devices. For higher power, use a single higher-rated Zener or add external series resistance to balance current distribution.

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

Yes - Nexperia specifies compatibility with IPC/JEDEC J-STD-020D reflow profiles. The SOD323 footprint (0.6 mm pad width, 0.5 mm spacing) supports peak temperatures up to 260 °C for ≤30 seconds. Thermal resistance data assumes tin-plated copper on FR4, so ensure solder mask-defined pads and adequate stencil aperture design for consistent paste volume.