Nexperia USA Inc. PDZ9.1B-QX

Overview

PDZ9.1B-QX from Nexperia is a single silicon Zener diode designed for precision voltage regulation and reference applications in low-power circuits. It delivers a nominal Zener voltage of 9.1 V at 5 mA, with ±2 % tolerance, 60 Ω maximum differential resistance at 5 mA, and 0.5 μA maximum reverse leakage current at 7.3 V - optimized for automotive-grade stability in compact SOD323 packages.

For engineers reviewing the PDZ9.1B-QX datasheet, PDZ9.1B-QX pinout, PDZ9.1B-QX application, or PDZ9.1B-QX equivalent, this device supports critical functions including overvoltage clamping in sensor interfaces, voltage reference generation in ADC biasing networks, and regulated supply rail stabilization in automotive body control modules.

Technical Context

This Zener diode operates in reverse breakdown mode with a hard knee characteristic, enabling stable regulation even at low test currents (IZ = 0.5 mA to 5 mA). Its temperature coefficient of +5.5 mV/K at 5 mA ensures predictable drift behavior across −65 °C to +150 °C junction temperature range.

Thermal performance is defined by Rth(j-sp) = 130 K/W (junction-to-solder point) and Rth(j-a) = 340 K/W (junction-to-ambient on FR4 PCB), supporting reliable derating up to 400 mW total power dissipation at 25 °C ambient - with linear reduction above that temperature per Fig. 1.

Key Specifications

Pinout & Package

PDZ9.1B-QX uses the SOD323 (SC-76) surface-mount plastic package: 1.35 mm × 0.8 mm footprint, 0.45 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 BZX55C9V1 and MMSZ5240B, PDZ9.1B-QX provides superior automotive qualification, tighter tolerance, and higher surge capability - making it the preferred choice for safety-critical voltage references where long-term parametric stability under thermal stress is mandatory.

Availability

PDZ9.1B-QX is available at Aetrix Electronics and suitable for automotive sensor biasing, ADC reference stabilization, and overvoltage clamping requiring stable component supply across production lifecycles.

Supply support for PDZ9.1B-QX 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.

PDZ9.1B-QX belongs to the PDZ-B-Q series - engineered specifically for AEC-Q101-compliant voltage regulation in harsh-environment automotive electronics, emphasizing low leakage, tight tolerance, and robust thermal performance.

FAQ

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

The PDZ9.1B-QX is rated for continuous Zener current up to 44 mA based on its 400 mW power limit and 9.1 V nominal voltage (P = V × I). Derating is required above 25 °C ambient per the published power derating curve, and operation beyond 44 mA at elevated temperatures risks irreversible junction damage.

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

At I_Z = 5 mA, the +5.5 mV/K coefficient means V_Z increases by approximately 5.5 mV per degree Celsius rise in junction temperature. Over a −40 °C to +125 °C range, this results in ~907 mV total drift - requiring system-level compensation if absolute voltage accuracy better than ±1 % is needed across full temperature range.

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

No - Zener diodes exhibit negative temperature coefficients below ~5 V and positive above, but even within the same batch, slight V_Z mismatches cause current hogging. Parallel operation is not recommended; instead, use a single higher-rated device or external current-sharing resistors with careful thermal coupling.

Is the SOD323 package compatible with standard reflow soldering profiles?

Yes - Nexperia specifies compatibility with IPC/JEDEC J-STD-020D reflow profiles. The recommended footprint (Fig. 9) uses 0.5 mm × 0.6 mm solder lands with 0.6 mm spacing; peak temperature must not exceed 260 °C for ≤10 seconds to avoid package delamination or marking degradation.