Nexperia USA Inc. BZX84W-C6V8X

Overview

BZX84W-C6V8X from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 6.8 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and 2 µA reverse current at 4 V, used for precision voltage reference and overvoltage protection in compact DC power rails.

For engineers reviewing the BZX84W-C6V8X datasheet, BZX84W-C6V8X pinout, BZX84W-C6V8X application, or BZX84W-C6V8X equivalent, this part supports stable low-current regulation in space-constrained consumer and industrial PCBs where thermal resistance (455 K/W) and low capacitance (200 pF) are critical for noise-sensitive analog stages.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable 6.8 V reference across load variations, with a temperature coefficient of +3.0 mV/K at 5 mA, indicating positive drift with junction temperature rise. Its differential resistance of 80 Ω at 5 mA ensures tight regulation under small-signal current changes.

The device uses silicon planar epitaxial construction for repeatable breakdown characteristics and is qualified for operation from −55 °C to +150 °C ambient, with non-repetitive peak reverse power dissipation up to 40 W for 100 µs pulses - enabling transient suppression in low-energy surge events.

Key Specifications

Pinout & Package

SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; 1.35 mm × 1.8 mm footprint, 0.65 mm pitch, and 0.9 mm max height - optimized for automated reflow assembly and high-density routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84W-C6V8X, the MMBZ5235BLT1G offers higher power margin but sacrifices high-frequency performance due to lower capacitance; the BZX84-C6V8-TP matches capacitance but reduces thermal headroom and long-term reliability under sustained 200 mW loads.

Availability

BZX84W-C6V8X is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, low-power voltage monitoring, and RF bias network stabilization requiring stable component supply across industrial, consumer, and communications designs.

Supply support for BZX84W-C6V8X 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 and industrial-grade components.

The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, thermally efficient voltage regulation in space-constrained SMT applications across consumer, industrial, and computing markets.

FAQ

What is the maximum continuous reverse current the BZX84W-C6V8X can handle at 25 °C?

The device supports a maximum continuous reverse current of 40 mA at 25 °C ambient, derived from its 275 mW power rating and 6.8 V Zener voltage (I_Z(max) = P_tot/V_Z ≈ 40 mA). Operation above this current requires derating per the thermal resistance curve and ambient temperature.

Can the BZX84W-C6V8X be used in forward-bias applications?

Yes - it exhibits a forward voltage of 0.9 V at 10 mA, making it suitable for low-voltage clamping or polarity protection in series with signal lines. However, its forward I-V curve is not characterized beyond 10 mA, so sustained forward conduction above that level is not recommended.

How does the +3.0 mV/K temperature coefficient affect regulation accuracy over temperature?

At 5 mA test current, the Zener voltage increases by 3.0 mV per Kelvin rise in junction temperature. Over a 100 K range (e.g., −25 °C to +75 °C), this yields ~300 mV drift - approximately ±4.4 % of 6.8 V - which must be accounted for in precision references unless compensated externally.

Is the n.c. pin (Pin 2) electrically isolated or internally bonded?

Pin 2 is a true no-connect terminal: it is electrically isolated from all internal die structures and serves only as a mechanical anchor for the SOT323 package. No PCB trace, solder mask opening, or thermal relief is required - leaving it unconnected poses no electrical or reliability risk.