Nexperia USA Inc. BZX84W-B6V8X

Overview

BZX84W-B6V8X from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 6.8 V nominal Zener voltage at 5 mA, 80 Ω differential resistance, and 3.0 mV/K positive temperature coefficient. It delivers stable reference voltage in low-power analog circuits, power supply feedback paths, and overvoltage protection nodes with 275 mW total power dissipation on FR4 PCB.

For engineers reviewing the BZX84W-B6V8X datasheet, BZX84W-B6V8X pinout, BZX84W-B6V8X application, or BZX84W-B6V8X equivalent, this page provides verified Zener voltage, tolerance, thermal resistance, reverse leakage, and package-specific soldering footprint data - critical for precision biasing, voltage clamping, and compact board-level regulation design.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable 6.8 V reference across load variations and temperature shifts. Its ±2 % tolerance ensures tight regulation accuracy, while the 3.0 mV/K positive temperature coefficient counterbalances typical negative drift in associated circuitry.

Designed for surface-mount use in space-constrained applications, it features a 3-pin SOT323 package with Pin 1 (anode), Pin 2 (not connected), and Pin 3 (cathode). Thermal resistance of 455 K/W (junction-to-ambient, FR4 PCB) defines its derating behavior under continuous DC or pulsed operation.

Key Specifications

Pinout & Package

SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; ultra-compact footprint (2.2 mm × 1.35 mm × 0.95 mm) optimized for high-density PCB layouts and reflow/wave soldering per Figures 9–10 in datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84W-B6V8X, MMBZ5235BS trades tighter regulation for lower cost, while BZX84-C6V8 offers identical package compatibility but sacrifices 3× voltage accuracy - making BZX84W-B6V8X optimal for precision analog feedback and reference nodes demanding ±2 % stability.

Availability

BZX84W-B6V8X is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and reference voltage source applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.

Supply support for BZX84W-B6V8X 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, serving automotive, industrial, and consumer markets with scalable manufacturing and rigorous quality systems.

The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, high-frequency-stable voltage regulation in space-constrained SMT applications - emphasizing repeatability, thermal robustness, and ESD resilience.

FAQ

What is the maximum continuous reverse current for BZX84W-B6V8X at 25 °C?

The device has no specified maximum continuous reverse current; instead, it is limited by total power dissipation. At 25 °C ambient and 6.8 V Zener voltage, the absolute maximum DC reverse current is 40.4 mA (275 mW ÷ 6.8 V), assuming ideal thermal conditions on FR4 PCB. Derating applies above 25 °C per R_th(j-a) = 455 K/W.

Can BZX84W-B6V8X be used in place of a 6.8 V Zener with ±5 % tolerance?

Yes, but only if the system design accommodates tighter voltage control. With ±2 % tolerance (6.66–6.94 V), BZX84W-B6V8X delivers narrower regulation than ±5 % parts (6.4–7.2 V), improving accuracy in feedback loops and reference circuits - though it may require layout verification to confirm thermal margin under identical power conditions.

Is Pin 2 internally connected or should it be left unconnected on the PCB?

Pin 2 is explicitly marked "n.c." (not connected) in the datasheet pinning table and simplified outline. It is electrically isolated inside the package and must remain unconnected on the PCB - no trace, pad, or solder mask coverage is required or recommended, as connection could compromise mechanical reliability or cause unintended parasitic coupling.

How does the +3.0 mV/K temperature coefficient affect long-term stability in a 0–70 °C operating range?

Over a 70 °C span, the Zener voltage shifts by +210 mV (3.0 mV/K × 70 K), resulting in a final value of ~7.01 V at 70 °C. This predictable positive drift allows compensation via series resistors or complementary NTC elements, and is significantly more stable than uncharacterized diodes lacking published S_Z data.