Nexperia USA Inc. PDZ27B-QX

Overview

PDZ27B-QX from Nexperia is a single Zener diode in SOD323 (SC-76) package, designed for precision voltage regulation at 27 V nominal working voltage with ±2 % tolerance, 400 mW total power dissipation, and 0.05 μA reverse current at VR = 21 V, qualified per AEC-Q101 for automotive power rail stabilization.

For engineers reviewing the PDZ27B-QX datasheet, PDZ27B-QX pinout, PDZ27B-QX application, or PDZ27B-QX equivalent, this device supports low-leakage, hard-knee breakdown voltage reference design in space-constrained automotive ECUs, battery management monitors, and industrial sensor signal conditioning circuits where thermal resistance to ambient (340 K/W) and junction-to-solder-point (130 K/W) are critical layout considerations.

Technical Context

This Zener diode operates in reverse-biased breakdown mode with a typical differential resistance of 150 Ω at IZ = 0.5 mA and 40 Ω at IZ = 5 mA, enabling stable regulation across varying load currents. Its temperature coefficient is +23.4 mV/K at IZ = 5 mA, indicating positive drift behavior suitable for compensation in bias networks.

The device exhibits a non-repetitive peak reverse current rating of 1.0 A (tp = 100 μs), and forward voltage is 0.9 V at IF = 10 mA and 1.1 V at IF = 100 mA - confirming low-loss conduction capability during transient forward events such as ESD clamp recovery.

Key Specifications

Pinout & Package

SOD323 (SC-76) surface-mount plastic package: 2-terminal, ultra-compact footprint (1.35 mm × 0.8 mm × 0.45 mm), cathode marked by bar on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C27 and MMSZ5256B, PDZ27B-QX delivers tighter ±2 % tolerance, lower leakage (0.05 μA vs ≥1 μA), AEC-Q101 validation, and SOD323 size - making it the sole choice for space-constrained, high-reliability automotive voltage references.

Availability

PDZ27B-QX is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor transmitters, onboard charger auxiliary supplies, and smart lighting driver reference circuits requiring stable component supply with guaranteed long-term availability.

Supply support for PDZ27B-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 energy-efficient solutions.

The PDZ-B-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for stable voltage reference and overvoltage protection in harsh automotive environments.

FAQ

What is the maximum reverse voltage (V_R) that PDZ27B-QX can withstand before breakdown?

PDZ27B-QX begins Zener breakdown at a minimum working voltage of 26.19 V (at I_Z = 5 mA). Its absolute maximum reverse voltage is not defined as a standalone parameter; instead, it is governed by the non-repetitive peak reverse current limit of 1.0 A at 100 μs pulse width. Operation above 27.53 V must be limited by series resistance to prevent exceeding P_tot = 400 mW or junction temperature limits.

How does the +23.4 mV/K temperature coefficient affect circuit performance?

The positive temperature coefficient means V_Z increases by approximately 23.4 mV per Kelvin rise in junction temperature. At 125 °C ambient (with self-heating), V_Z may rise ~2.4 V above its 25 °C value - a critical factor when designing temperature-stable references. Compensation techniques, such as pairing with negative-TC components, are recommended for precision applications.

Can PDZ27B-QX be used in forward conduction mode?

Yes - PDZ27B-QX conducts forward current up to 200 mA continuously, with VF = 0.9 V at 10 mA and 1.1 V at 100 mA. It is commonly used in dual-role configurations: reverse-biased for regulation and forward-biased as an ESD protection clamp or low-drop rectifier in low-power auxiliary paths.

Is the SOD323 package compatible with standard reflow soldering profiles?

Yes - Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles. The recommended footprint uses 0.5 mm × 0.6 mm solder lands (Fig. 9), and thermal pad design must follow the 1.35 mm × 0.8 mm outline with 0.25 mm lead pitch. Peak temperature must not exceed 260 °C for ≤ 30 seconds to avoid package delamination.