Nexperia USA Inc. BZX84W-C27-QX

Overview

BZX84W-C27-QX from Nexperia is a ±5% tolerance Zener diode in SOT323 (SC-70) package, rated for 27 V nominal regulation voltage at 2 mA, with 300 Ω differential resistance, 23.4 mV/K temperature coefficient, and 275 mW total power dissipation. It delivers stable voltage reference in automotive power rail monitoring and ECU biasing circuits.

For engineers reviewing the BZX84W-C27-QX datasheet, BZX84W-C27-QX pinout, BZX84W-C27-QX application, or BZX84W-C27-QX equivalent, this page provides verified Zener parameters, AEC-Q101 qualification status, thermal resistance (455 K/W), reverse leakage (50 nA at 18.9 V), and SC-70 footprint compatibility for high-density PCB designs.

Technical Context

This Zener operates in reverse breakdown mode with a specified 27 V nominal Zener voltage at I_Z = 2 mA, exhibiting a positive temperature coefficient of +23.4 mV/K - indicating increasing V_Z with junction temperature rise. Its 300 Ω differential resistance ensures predictable regulation slope under varying load current.

The device supports non-repetitive surge handling up to 50 A peak reverse current (I_ZSM) for 100 µs pulses and maintains ≤50 nA reverse leakage at 0.7 × V_Znom (18.9 V), critical for low-power standby circuits. Thermal resistance from junction-to-ambient is 455 K/W on standard FR4 PCB, defining safe derating above 25 °C ambient.

Key Specifications

Pinout & Package

SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm body size, 0.65 mm pitch, and tin-plated copper leads compatible with reflow soldering per IPC-J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84W-C27-QX, the BZX84W-B27-Q offers tighter regulation accuracy at the expense of higher unit cost, while MMSZ5254ET1G trades miniaturization for enhanced thermal robustness - making the QX variant optimal for space-constrained automotive modules needing AEC-Q101 compliance and SC-70 scalability.

Availability

BZX84W-C27-QX is available at Aetrix Electronics and suitable for automotive ECU monitoring, industrial sensor biasing, USB-C PD protection, and medical portable device standby regulation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BZX84W-C27-QX 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.

The BZX84W-Q series targets automotive-grade Zener regulation, designed specifically to meet AEC-Q101 stress requirements while delivering consistent voltage reference performance in harsh environments.

FAQ

What is the maximum continuous reverse current for BZX84W-C27-QX at 25 °C?

The device does not specify a maximum continuous reverse current; instead, it defines maximum power dissipation of 275 mW at 25 °C ambient. At 27 V nominal Zener voltage, this corresponds to ~10.2 mA average reverse current (275 mW ÷ 27 V). Operation beyond this requires thermal derating per the 455 K/W junction-to-ambient resistance.

Is pin 2 electrically functional or a mechanical dummy lead?

Pin 2 is explicitly designated "n.c." (not connected) in the official Nexperia pinning table and simplified outline. It is an internal dummy lead with no electrical connection to the die - PCB traces must omit this pad to prevent unintended coupling or solder bridging.

How does the +23.4 mV/K temperature coefficient impact circuit design?

This positive coefficient means V_Z increases by 23.4 mV per 1 °C rise in junction temperature. In precision references, it necessitates either thermal compensation (e.g., pairing with negative-TC components) or operating within a narrow ambient range. For overvoltage protection, it provides inherent margin against false triggering at elevated temperatures.

Can BZX84W-C27-QX be used in place of BZX84-C27 in existing SOT23 designs?

No - BZX84W-C27-QX uses SOT323 (SC-70) packaging (1.3 × 1.8 mm, 0.65 mm pitch), whereas standard BZX84-C27 uses SOT23 (2.9 × 1.3 mm, 0.95 mm pitch). Footprint, solder stencil, and reflow profile are incompatible; mechanical redesign is required for migration.