Nexperia USA Inc. BZX84W-B5V6X

Overview

BZX84W-B5V6X from Nexperia is a ±2% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 5.6 V nominal Zener voltage at 5 mA, 400 Ω differential resistance, and 1.2 mV/K temperature coefficient. It delivers stable voltage reference in low-power analog circuits, power supply feedback paths, and overvoltage protection nodes.

For engineers reviewing the BZX84W-B5V6X datasheet, BZX84W-B5V6X pinout, BZX84W-B5V6X application, or BZX84W-B5V6X equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance at operating current, thermal coefficient behavior, and SOT323 footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable 5.6 V reference across its cathode–anode terminals under controlled current conditions. Its ±2% tolerance ensures tight regulation accuracy, while the 1.2 mV/K positive temperature coefficient minimizes drift over ambient temperature ranges from −55 °C to +150 °C.

The device exhibits 400 Ω differential resistance at I_Z = 5 mA, enabling predictable voltage deviation under load variation. With 275 mW total power dissipation on FR4 PCB and non-repetitive peak reverse power capability of 40 W (100 µs pulse), it supports transient clamping and steady-state regulation in compact power management designs.

Key Specifications

Pinout & Package

SOT323 (SC-70) leadless surface-mount package: 1.35 mm × 1.75 mm footprint, 0.65 mm pitch, 0.9 mm max height, optimized for automated placement and reflow soldering on high-density boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84W-C5V6, the BZX84W-B5V6X offers tighter regulation at identical dynamic impedance; versus MMSZ5232B, it provides superior board-area efficiency and thermal performance per unit volume despite lower absolute power rating.

Availability

BZX84W-B5V6X is available at Aetrix Electronics and suitable for power supply feedback, overvoltage clamp, and reference voltage source applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for BZX84W-B5V6X 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 essential components including logic, discretes, MOSFETs, and bipolar transistors.

The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for stable voltage regulation in cost-sensitive, space-constrained consumer, industrial, and computing applications.

FAQ

What is the maximum continuous reverse current this Zener can handle?

The BZX84W-B5V6X has an absolute maximum forward current of 200 mA, but for Zener operation, the recommended continuous reverse current is limited by power dissipation: at 5.6 V, maximum I_Z ≈ 49 mA (275 mW ÷ 5.6 V). Exceeding this risks thermal runaway on standard FR4 PCBs.

Does the n.c. pin require PCB routing or grounding?

No. Pin 2 is internally not connected and must remain unconnected on the PCB. Routing or grounding it may cause mechanical stress or solder bridging; the SOT323 footprint design intentionally isolates this pad for manufacturability and thermal isolation.

How does the +1.2 mV/K temperature coefficient affect regulation accuracy over temperature?

From 25 °C to 125 °C (ΔT = 100 K), V_Z increases by ~120 mV (1.2 mV/K × 100 K), resulting in a +2.1% shift from nominal 5.6 V. This predictable positive drift allows compensation in systems where temperature monitoring is available.

Can this Zener be used in place of a 5.1 V or 6.2 V variant without circuit modification?

No. The BZX84W-B5V6X is specified only for 5.6 V regulation. Substituting with 5.1 V or 6.2 V types alters feedback thresholds, potentially causing output voltage errors >±10%, instability in regulated supplies, or incorrect clamping levels-circuit recalibration is required.