Nexperia USA Inc. BZX84W-B4V3F

Overview

BZX84W-B4V3F from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 4.3 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and 90 Ω differential resistance. It provides precision voltage reference and regulation in low-power analog circuits, power supply feedback paths, and overvoltage protection clamping.

For engineers reviewing the BZX84W-B4V3F datasheet, BZX84W-B4V3F pinout, BZX84W-B4V3F application, or BZX84W-B4V3F equivalent, this page delivers verified electrical parameters, thermal behavior, real-world clamping performance, and direct substitution guidance for design-in and BOM optimization.

Technical Context

This Zener diode operates in reverse breakdown with a tightly controlled 4.3 V nominal working voltage (±2 %), exhibiting a temperature coefficient of −2.5 mV/K at 5 mA, enabling stable regulation across −55 °C to +150 °C ambient. Its 90 Ω differential resistance ensures minimal output voltage variation under load current shifts.

Designed for surface-mount use on FR4 PCBs with single-sided copper, it delivers 275 mW steady-state power dissipation and withstands non-repetitive peak reverse power up to 40 W (100 µs pulse), supporting transient suppression in compact DC/DC and LDO feedback networks.

Key Specifications

Pinout & Package

Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals; footprint compatible with reflow and wave soldering per Nexperia's standardized land patterns.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84W-B4V3F, the BZX84W-C4V3 offers identical form and thermal behavior at lower accuracy and cost, while MMSZ4V3T1G trades size and precision for higher power-making the B-series optimal for accuracy-critical, space-constrained regulation.

Availability

BZX84W-B4V3F is available at Aetrix Electronics and suitable for power supply feedback, overvoltage clamp, and reference voltage source applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for BZX84W-B4V3F 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 rigorous quality and scalability.

The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for precision voltage regulation and clamping in compact, cost-sensitive SMT applications across consumer electronics and industrial controls.

FAQ

What is the maximum continuous reverse current the BZX84W-B4V3F can sustain at 25 °C?

The device has no specified maximum continuous reverse current rating; instead, its safe operating limit is defined by power dissipation. At 25 °C ambient on a standard FR4 PCB, it sustains up to 275 mW, corresponding to ~64 mA at 4.3 V (P = V × I). Exceeding this causes junction temperature rise beyond 150 °C.

Does the 'F' suffix in BZX84W-B4V3F indicate a specific packaging or marking variant?

Yes-the 'F' suffix denotes the Nexperia-specific marking code for the BZX84W-B4V3 type, which is 'D9%' per Table 4. This code appears laser-marked on the top surface of the SOT323 package and identifies both the 4.3 V rating and ±2 % tolerance, not a separate packaging variant.

Can BZX84W-B4V3F be used in place of a 3.3 V Zener for logic-level translation?

No-it is not suitable for logic-level translation. With a 4.3 V Zener voltage, it clamps above standard 3.3 V logic rails and lacks the fast switching or bidirectional characteristics needed for level shifting. Its function is strictly voltage regulation or overvoltage protection at 4.3 V.

How does the 2nd pin (n.c.) affect PCB layout and thermal performance?

The n.c. pin is internally unconnected and must remain electrically isolated-no trace, pad, or solder mask overlap is permitted. Its presence does not impact thermal resistance (R_th(j-a) = 455 K/W), as heat flows through pins 1 and 3 only; violating isolation risks shorting or mechanical stress during reflow.