Nexperia USA Inc. BZX84W-B9V1F

Overview

BZX84W-B9V1F from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 9.1 V nominal Zener voltage at 5 mA, 100 Ω differential resistance, and 5.5 mV/K temperature coefficient. It delivers stable reference voltage in low-power analog circuits, power supply feedback loops, and overvoltage protection nodes with 275 mW total power dissipation on FR4 PCB.

For engineers reviewing the BZX84W-B9V1F datasheet, BZX84W-B9V1F pinout, BZX84W-B9V1F application, or BZX84W-B9V1F equivalent, key selection criteria include Zener voltage tolerance, thermal coefficient behavior at operating current, junction-to-ambient thermal resistance, reverse leakage at specified VR, and SOT323 footprint compatibility with high-density layouts.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable 9.1 V reference across load variations, with differential resistance of 100 Ω at IZ = 5 mA ensuring minimal output voltage shift under current changes. Its positive temperature coefficient of +5.5 mV/K at 5 mA enables predictable drift compensation in temperature-sensitive references.

Designed for surface-mount use on standard FR4 PCBs, it supports continuous operation up to 150 °C junction temperature and withstands non-repetitive peak reverse power surges of 40 W (tp = 100 µs). The 3-pin SOT323 package features an isolated center pin (n.c.) to reduce parasitic capacitance in high-frequency regulation.

Key Specifications

Pinout & Package

SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; compact 2.2 mm × 1.35 mm footprint 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-B9V1F, MMBZ5240BS trades precision and HF capability for lower cost in SOT-23, while BZX84-C9V1 shares the package but sacrifices tolerance, leakage, and differential resistance - making BZX84W-B9V1F optimal for high-accuracy, high-frequency, or ultra-low-power Zener applications.

Availability

BZX84W-B9V1F is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp protection, and low-power sensor biasing requiring stable component supply, consistent Zener voltage matching, and verified SOT323 thermal performance.

Supply support for BZX84W-B9V1F 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 delivering high-performance, reliable discrete, logic, and MOSFET solutions with focus on efficiency, miniaturization, and robustness for mass-market electronics.

BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for stable voltage regulation in space-constrained, high-reliability consumer, industrial, and communication systems.

FAQ

What is the maximum continuous forward current for BZX84W-B9V1F?

The device is not rated for continuous forward conduction; its primary function is reverse-bias Zener operation. Absolute maximum forward current is 200 mA per limiting values table, but sustained forward bias risks thermal runaway and parameter shift. Forward voltage is specified at 10 mA (≤0.9 V), intended only for brief testing or polarity verification.

Can BZX84W-B9V1F be used in place of a 9.1 V Zener in an existing SOT-23 design?

No - BZX84W-B9V1F uses SOT323 (SC-70) with 3 pins including a not-connected center terminal, whereas SOT-23 has 3 functional pins in different spacing and orientation. Footprint, solder mask, and thermal pad layout are incompatible; mechanical redesign is required for migration.

How does the n.c. pin affect PCB layout and thermal performance?

The n.c. pin (Pin 2) is electrically isolated and must not be soldered or connected. Its presence reduces parasitic capacitance between anode and cathode, improving high-frequency response. Thermally, it slightly increases package thermal resistance versus 2-pin equivalents, but the 455 K/W rating accounts for this in the FR4 test condition.

Is BZX84W-B9V1F qualified for automotive applications?

No - per Revision History section 13, this part is explicitly non-automotive qualified (Rev. 2, Jan 2023). It lacks AEC-Q200 stress testing and automotive-grade process controls. For automotive use, Nexperia offers separate -Q qualified variants (e.g., BZX84W-Q series), which must be selected instead.