Nexperia USA Inc. BZX84W-C3V3F

Overview

BZX84W-C3V3F from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, providing 3.3 V nominal regulation at 5 mA, with 95 Ω differential resistance and −2.4 mV/K temperature coefficient, used for precision low-voltage reference and biasing in power management circuits.

For engineers reviewing the BZX84W-C3V3F datasheet, BZX84W-C3V3F pinout, BZX84W-C3V3F application, or BZX84W-C3V3F equivalent, this page delivers verified Zener parameters, thermal limits, SOT323 terminal mapping, and direct alternatives for voltage reference design in space-constrained consumer and industrial electronics.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable 3.3 V output across load and line variations, with specified test current of 5 mA and maximum reverse current of 5 µA at VR = 1 V. Its negative temperature coefficient (−2.4 mV/K) enables predictable drift compensation in analog references.

The device uses silicon planar epitaxial construction for low noise and tight voltage tolerance, optimized for high-frequency decoupling due to 6 pF junction capacitance at 1 MHz and 0 V bias. It is rated for 275 mW total power dissipation on FR4 PCB with single-sided copper.

Key Specifications

Pinout & Package

SOT323 (SC-70) plastic surface-mounted package: ultra-compact 3-terminal leadless outline with 0.65 mm pitch, 2.2 mm × 1.35 mm footprint, and 0.95 mm height - optimized for automated reflow assembly and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84W-C3V3F, MMBZ5226BS offers higher power but requires larger layout area, while BZX84-C3V3 matches footprint and tolerance but trades 25 mW extra dissipation for marginally higher dynamic impedance - both require validation of thermal derating in high-ambient environments.

Availability

BZX84W-C3V3F is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection, low-power bias generation, and RF signal conditioning requiring stable component supply and traceable sourcing.

Supply support for BZX84W-C3V3F 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

BZX84W-C3V3F belongs to the BZX84W series of general-purpose Zener diodes designed for compact, high-frequency voltage regulation and clamping in space-constrained PCBs.

FAQ

What is the maximum continuous reverse current for BZX84W-C3V3F at 3.3 V regulation?

The device is rated for 5 mA nominal Zener test current (IZ), with absolute maximum forward current of 200 mA. At 3.3 V regulation, continuous reverse current must be limited to ensure junction temperature stays below 150 °C - typically ≤15 mA on standard FR4 PCB, based on 275 mW power limit and thermal resistance of 455 K/W.

Can BZX84W-C3V3F be used in place of a 3.3 V LDO for power supply regulation?

No - it lacks active regulation circuitry and cannot source significant load current. It provides voltage reference or shunt regulation only, requiring an external current-limiting resistor. For load regulation, a dedicated LDO (e.g., TPS7A05) is required; BZX84W-C3V3F serves best as a precision reference or protection element.

Is the n.c. pin (Pin 2) electrically isolated or internally tied to substrate?

Pin 2 is explicitly marked "not connected" in the datasheet and is fully electrically isolated - no internal bond wire or die connection exists. It must remain unconnected on PCB to prevent mechanical stress or unintended coupling; solder mask should fully cover the pad.

How does the −2.4 mV/K temperature coefficient affect long-term stability in a 0–85 °C operating range?

Over 85 °C temperature span, the Zener voltage shifts by −204 mV (−2.4 mV/K × 85 K), resulting in ~6.2 % deviation from 3.3 V nominal. This drift is predictable and linear, enabling software calibration in closed-loop systems, but makes it unsuitable for applications requiring <±0.5 % voltage stability without compensation.