Nexperia USA Inc. BZX84W-B8V2F

Overview

BZX84W-B8V2F from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, designed for precision voltage reference and clamping in low-power analog circuits. It delivers 8.2 V nominal regulation at 5 mA, with 80 Ω differential resistance, 4.6 mV/K temperature coefficient, and 150 pF junction capacitance at 1 MHz - enabling stable operation in high-frequency power supply feedback loops and signal conditioning stages.

For engineers reviewing the BZX84W-B8V2F datasheet, BZX84W-B8V2F pinout, BZX84W-B8V2F application, or BZX84W-B8V2F equivalent, key selection criteria include Zener voltage tolerance (±2 %), thermal resistance (455 K/W), non-repetitive surge capability (40 W @ 100 µs), and SC-70 footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable 8.2 V reference across load and line variations. Its ±2 % tolerance ensures tight regulation accuracy, while the 80 Ω differential resistance minimizes output voltage drift under changing current conditions (IZ = 1–5 mA).

With a positive temperature coefficient of +4.6 mV/K at 5 mA, it exhibits predictable voltage drift over temperature (−55 °C to +150 °C), and its 150 pF junction capacitance supports use in RF decoupling and fast transient suppression up to ~10 MHz.

Key Specifications

Pinout & Package

SOT323 (SC-70) leadless surface-mount plastic package: 1.35 mm × 1.75 mm footprint, 0.95 mm height, 3-terminal configuration with exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84W-C8V2, the BZX84W-B8V2F offers tighter regulation for feedback-critical designs; versus MMSZ4689T1G, it trades thermal margin for 40 % smaller PCB area and identical mounting process compatibility.

Availability

BZX84W-B8V2F is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp protection, and low-power voltage reference applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for BZX84W-B8V2F 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 ISO/TS 16949-certified manufacturing.

The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, stable voltage regulation in space-constrained and high-frequency applications - especially where SC-70 packaging and tight tolerance are critical.

FAQ

What is the maximum continuous Zener current for BZX84W-B8V2F at 25 °C ambient?

The device supports up to 33.5 mA continuous Zener current at 25 °C ambient, calculated from P_tot = 275 mW and V_Z ≈ 8.2 V (I_Zmax = P_tot/V_Z). Derating is required above 25 °C per the 455 K/W thermal resistance; at 85 °C ambient, max continuous I_Z drops to ~18 mA.

Can BZX84W-B8V2F replace a 1N4738A in an existing design?

No - the 1N4738A is a 8.2 V, 1 W through-hole Zener in DO-41 package, while BZX84W-B8V2F is a 275 mW, SC-70 surface-mount device. Direct replacement requires verifying thermal dissipation capability, PCB footprint compatibility, and surge robustness; the lower power rating and different package make it unsuitable without layout and thermal redesign.

Is pin 2 truly unused, or does it serve a mechanical or thermal function?

Pin 2 is electrically not connected (n.c.) per Nexperia's official pinning diagram and internal construction. It has no electrical, thermal, or mechanical function - it is a structural stub from the leadframe and must remain unconnected on the PCB; no solder mask opening or copper pour is required or recommended.

How does the +4.6 mV/K temperature coefficient affect regulation stability over −40 °C to +85 °C?

Over that range, V_Z shifts by +217 mV (4.6 mV/K × 47 K), resulting in ~2.6 % change from nominal 8.2 V. This is within expected behavior for ±2 % tolerance Zeners and is fully characterized in the datasheet's temperature coefficient curves; system-level compensation is unnecessary unless sub-1 % absolute accuracy is required.