Nexperia USA Inc. PDZ9.1B-QF

Overview

PDZ9.1B-QF from Nexperia is a single silicon Zener diode designed for low-power voltage regulation and reference applications in automotive and industrial circuits. It provides a nominal 9.1 V Zener voltage at 5 mA, with ±2 % tolerance, 60 Ω maximum differential resistance at 5 mA, 0.5 μA maximum reverse leakage at 7.3 V, and operates within a −65 °C to +150 °C junction temperature range.

For engineers reviewing the PDZ9.1B-QF datasheet, PDZ9.1B-QF pinout, PDZ9.1B-QF application, or PDZ9.1B-QF equivalent, this device is selected for precision clamping, overvoltage protection, and stable biasing where compact SOD323 packaging, AEC-Q101 qualification, and low dynamic impedance at low currents are critical.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its cathode–anode terminals under controlled current conditions. Its hard breakdown knee and low leakage (≤0.5 μA at VR = 7.3 V) support accurate regulation in low-current sensing and feedback paths.

The device exhibits a positive temperature coefficient of +5.5 mV/K at IZ = 5 mA and thermal resistance of 340 K/W (junction-to-ambient on FR4 PCB), enabling predictable behavior in thermally constrained layouts without active compensation.

Key Specifications

Pinout & Package

PDZ9.1B-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 optimized for reflow soldering on FR4 PCBs. The cathode is marked by a visible bar on the package top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C9V1 and MMSZ5240B, PDZ9.1B-QF delivers superior regulation accuracy (±2 % vs. ±5 %), lower dynamic impedance (60 Ω vs. ≥100 Ω), and automotive qualification-making it the optimal choice for high-reliability, space-constrained voltage reference and clamping tasks.

Availability

PDZ9.1B-QF is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial power supply clamping, and medical instrument signal conditioning requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for PDZ9.1B-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.

The PDZ-B-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage regulation and clamping in automotive ECUs, ADAS modules, and industrial control systems operating under extended temperature and vibration stress.

FAQ

What is the maximum reverse current PDZ9.1B-QF can handle during transient events?

PDZ9.1B-QF supports a non-repetitive peak reverse current (I_ZSM) of 3.5 A for 100 µs square-wave pulses at 25 °C ambient, verified per IEC 60134 limiting values. This rating enables effective clamping of short-duration surges without permanent degradation, provided thermal derating is applied for repeated events or elevated ambient temperatures.

How does the +5.5 mV/K temperature coefficient affect circuit design?

The +5.5 mV/K coefficient means the Zener voltage increases by approximately 5.5 mV per degree Celsius rise in junction temperature at 5 mA test current. Designers must account for this drift in precision references-either through temperature-compensated circuit topologies or by limiting self-heating via current derating and thermal management on the PCB.

Is PDZ9.1B-QF compatible with lead-free reflow soldering profiles?

Yes-PDZ9.1B-QF uses a standard SOD323 package with matte tin-plated terminations rated for JEDEC J-STD-020-compliant lead-free reflow, including peak temperatures up to 260 °C. The recommended reflow footprint (Figure 9) specifies 0.5 mm pad width and 0.6 mm solder mask opening for reliable wetting and void control.

Can PDZ9.1B-QF be used in forward-bias applications?

Yes-the device exhibits ≤0.9 V forward voltage at 10 mA, making it suitable for low-drop rectification or ESD protection in forward conduction mode. However, its primary design intent and characterization are for reverse-bias Zener operation; forward parameters are specified only under pulsed conditions (tp ≤ 300 µs) and not guaranteed for continuous DC conduction.