Nexperia USA Inc. BZX84W-B3V0-QF

Overview

BZX84W-B3V0-QF from Nexperia is a ±2 % tolerance Zener diode in SOT323 (SC-70) package, rated for 3.0 V nominal regulation voltage at 5 mA, with 275 mW total power dissipation and qualified to AEC-Q101 for automotive use. It delivers stable voltage reference in low-power biasing, overvoltage clamping, and precision threshold detection circuits.

For engineers reviewing the BZX84W-B3V0-QF datasheet, BZX84W-B3V0-QF pinout, BZX84W-B3V0-QF application, or BZX84W-B3V0-QF equivalent, key selection criteria include Zener voltage tolerance (±2 %), low differential resistance (95 Ω at 5 mA), reverse leakage (10 µA at 1 V), thermal resistance (455 K/W), and AEC-Q101 qualification status.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 3.0 V at I_Z = 5 mA, exhibiting a negative temperature coefficient of −2.1 mV/K across its operating current range. Its differential resistance remains ≤95 Ω under specified test conditions, ensuring tight regulation stability against load variation.

The device features a non-connected terminal (Pin 2), anode (Pin 1), and cathode (Pin 3), enabling unidirectional clamping in compact PCB layouts. Its SOT323 footprint supports high-density placement while maintaining thermal performance on FR4 boards with single-sided copper.

Key Specifications

Pinout & Package

SOT323 (SC-70) plastic surface-mounted package with 3 leads; leadless, very small outline optimized for automated assembly and space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84W-C3V0-Q, the BZX84W-B3V0-QF offers tighter regulation and better thermal stability for safety-critical functions; versus MMSZ4684T1G, it trades power headroom for automotive qualification and smaller SOT323 size-critical for ADAS module miniaturization.

Availability

BZX84W-B3V0-QF is available at Aetrix Electronics and suitable for automotive sensor biasing, USB port protection, and industrial PLC input protection requiring stable component supply, AEC-Q101 traceability, and SOT323 footprint compatibility.

Supply support for BZX84W-B3V0-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 energy-efficient solutions.

The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage regulation and transient suppression in automotive ECUs, body electronics, and ADAS subsystems.

FAQ

What is the maximum continuous reverse current this Zener can sustain at 3.0 V?

The BZX84W-B3V0-QF is not rated for continuous reverse current at its Zener voltage; instead, it specifies a maximum Zener test current of 5 mA for parameter characterization. Continuous operation should be limited to currents that keep power dissipation ≤275 mW - i.e., ≤91 mA at 3.0 V - but derating per ambient temperature and PCB thermal design is mandatory.

Does the n.c. pin require grounding or floating in PCB layout?

Pin 2 is internally not connected and must remain electrically floating - no trace, pad, or via should connect to it. Grounding or routing near this pin risks parasitic capacitance increase or solder bridging, which could degrade high-frequency clamping performance or cause assembly defects.

How does the −2.1 mV/K temperature coefficient affect regulation accuracy over temperature?

At 3.0 V nominal, the −2.1 mV/K coefficient causes a −21 mV shift over a 10 K rise. From −40 °C to +125 °C (165 K ΔT), total drift is ≈−347 mV - but actual variation is bounded by the ±2 % initial tolerance and measured typical behavior, resulting in practical regulation between 2.75 V and 3.15 V across full automotive range.

Can this Zener be used in forward conduction mode like a standard diode?

Yes - its forward voltage is ≤0.9 V at 10 mA, matching typical silicon diode behavior. It supports dual-use in circuits requiring both Zener regulation and forward rectification, such as bidirectional transient suppressors or level-shifted bias networks, though forward current must stay within 200 mA absolute maximum rating.