Nexperia USA Inc. BZX84W-B3V6X

Overview

BZX84W-B3V6X from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 3.6 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and 90 Ω differential resistance. It serves as a precision reference or low-power voltage clamp in power supply feedback paths, sensor biasing circuits, and overvoltage protection nodes.

For engineers reviewing the BZX84W-B3V6X datasheet, BZX84W-B3V6X pinout, BZX84W-B3V6X application, or BZX84W-B3V6X equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (455 K/W), reverse leakage at VR = 1 V (5 µA), forward voltage at 10 mA (≤0.9 V), and SOT323 footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage regulation across load and line variations. Its ±2 % tolerance ensures tight output control in reference circuits, while the 90 Ω differential resistance limits regulation error under varying current conditions.

Designed for surface-mount use on FR4 PCBs with single-sided copper, it delivers 275 mW continuous power dissipation and withstands non-repetitive peak reverse power up to 40 W (tp = 100 µs). Junction temperature remains within safe limits up to 150 °C, supporting operation in industrial ambient environments (−55 °C to +150 °C).

Key Specifications

Pinout & Package

The BZX84W-B3V6X is housed in a leadless SOT323 (SC-70) plastic surface-mount package measuring 2.2 mm × 1.35 mm × 0.95 mm, optimized for automated placement and reflow soldering on high-density boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84W-C3V6, the BZX84W-B3V6X offers tighter voltage control critical for feedback accuracy; versus MMSZ4685T1G, it trades power margin for space efficiency and lower parasitic capacitance in compact, high-frequency designs.

Availability

BZX84W-B3V6X is available at Aetrix Electronics and suitable for power supply feedback references, sensor biasing networks, overvoltage clamp protection, and microcontroller I/O line protection requiring stable component supply and consistent parametric performance across production batches.

Supply support for BZX84W-B3V6X 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 semiconductors for power management, logic, analog, and discrete devices, serving automotive, industrial, and consumer markets with high-volume, high-reliability components.

The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, high-frequency voltage regulation and protection in space-constrained, cost-sensitive applications where precision and consistency are required.

FAQ

What is the maximum continuous reverse current the BZX84W-B3V6X can handle at 25 °C?

The device is rated for a maximum forward current of 200 mA, but its Zener operation relies on controlled reverse current. At 25 °C ambient, the maximum continuous reverse current is determined by power dissipation: I_Zmax = P_tot / V_Z ≈ 275 mW / 3.6 V ≈ 76 mA. Operation beyond this requires thermal derating per the 455 K/W R_th(j-a) value.

Does the 'n.c.' pin require PCB routing or grounding?

No - Pin 2 is internally not connected and must remain unconnected on the PCB. Routing or grounding this terminal introduces risk of contamination-induced leakage paths or parasitic coupling that could degrade Zener voltage stability and reverse leakage performance.

How does the temperature coefficient affect regulation accuracy over −40 °C to +85 °C?

At 3.6 V nominal, the BZX84W-B3V6X exhibits a typical temperature coefficient (S_Z) of −2.4 mV/K. Over a 125 K span, this contributes up to ±300 mV drift. For applications demanding <±10 mV variation, active compensation or tighter ambient control is required.

Can BZX84W-B3V6X replace older BZX84-C3V6 in existing designs?

Yes - both share identical SOT323 package, pinout, and 3.6 V nominal Zener voltage. The BZX84W-B3V6X improves tolerance (±2 % vs. ±5 %) and reduces differential resistance (90 Ω vs. ~100 Ω), enhancing regulation accuracy and load transient response without layout changes.