Nexperia USA Inc. BZX84W-B6V8-QF

Overview

BZX84W-B6V8-QF from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 6.8 V nominal breakdown voltage at 5 mA, 80 Ω differential resistance, and 3.0 mV/K positive temperature coefficient. It delivers stable reference voltage in automotive power supply rails and low-power analog circuits with 275 mW total power dissipation at 25 °C ambient.

For engineers reviewing the BZX84W-B6V8-QF datasheet, BZX84W-B6V8-QF pinout, BZX84W-B6V8-QF application, or BZX84W-B6V8-QF equivalent, this part supports AEC-Q101-compliant voltage regulation, high-frequency decoupling, and precision biasing where tight tolerance and thermal stability are required.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain a stable 6.8 V reference across load variations, with a typical differential resistance of 80 Ω at I_Z = 5 mA ensuring minimal output voltage drift under current changes. Its +3.0 mV/K temperature coefficient enables predictable voltage shift over −55 °C to +150 °C junction range.

The device features a non-connected (n.c.) terminal (Pin 2), isolating internal structure from external circuitry while preserving mechanical integrity in the SOT323 footprint. It sustains 40 W non-repetitive peak reverse power for 100 µs pulses, supporting transient suppression in compact automotive modules.

Key Specifications

Pinout & Package

SOT323 (SC-70) surface-mount plastic package: 1.35 mm × 1.75 mm body, 0.65 mm pitch, 3-terminal leadless design optimized for automated reflow assembly and space-constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5235BS and BZX84-C6V8, the BZX84W-B6V8-QF uniquely combines ±2 % tolerance, 80 Ω differential resistance, and AEC-Q101 qualification-making it the only option among the three qualified for ASIL-B–relevant automotive voltage references requiring both precision and reliability.

Availability

BZX84W-B6V8-QF is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, USB-C power delivery monitors, and medical portable diagnostic devices requiring stable component supply with full traceability and lifecycle continuity.

Supply support for BZX84W-B6V8-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 automotive Zener diode product line, engineered specifically for precision voltage regulation in harsh-environment electronic control units where AEC-Q101 compliance and parametric consistency are mandatory.

FAQ

What is the maximum continuous reverse current the BZX84W-B6V8-QF can sustain at 25 °C?

The device does not specify a maximum continuous reverse current independently; instead, its safe operating limit is defined by total power dissipation. At 25 °C ambient on a standard FR4 PCB, the 275 mW rating permits up to approximately 40.4 mA reverse current (275 mW ÷ 6.8 V) before exceeding thermal limits-subject to derating above 25 °C per the 455 K/W junction-to-ambient thermal resistance.

Is Pin 2 electrically connected internally, and what happens if it is soldered to ground?

No, Pin 2 is explicitly designated "not connected" (n.c.) in the official pinning diagram and has no internal bond wire or silicon connection. Soldering it to ground introduces no electrical effect but risks mechanical stress on the package or solder joint cracking due to CTE mismatch-Nexperia recommends leaving it floating and unconnected in PCB layout and assembly.

How does the +3.0 mV/K temperature coefficient impact regulation accuracy over −40 °C to +125 °C ambient?

Across a 165 K temperature span, the coefficient produces a total drift of +495 mV (3.0 mV/K × 165 K), shifting the nominal 6.8 V Zener voltage to ~7.295 V at +125 °C ambient. This is confirmed in Figure 7 of the datasheet and must be accounted for in high-accuracy reference designs-compensation techniques include pairing with negative-coefficient components or using lookup-table-based software correction.

Can the BZX84W-B6V8-QF be used in place of a 6.8 V Zener diode in a classic linear regulator feedback divider?

Yes-it functions identically to conventional Zeners in shunt regulator or feedback divider topologies. Its 80 Ω differential resistance ensures <0.5 % output error from current variation up to ±2 mA, and its 2 µA leakage at 4 V prevents significant divider current error. However, the n.c. Pin 2 must be omitted from schematic symbols and layout footprints to avoid misinterpretation as a functional terminal.