Nexperia USA Inc. BZX84W-C5V1-QF

Overview

BZX84W-C5V1-QF from Nexperia is a ±5% tolerance Zener diode in SOT323 (SC-70) package, designed for precision voltage regulation at 5.1 V nominal working voltage, with 480 Ω differential resistance at 5 mA and −0.8 mV/K temperature coefficient, used in automotive power rail stabilization and high-frequency bias networks.

For engineers reviewing the BZX84W-C5V1-QF datasheet, BZX84W-C5V1-QF pinout, BZX84W-C5V1-QF application, or BZX84W-C5V1-QF equivalent, this page delivers verified Zener parameters, AEC-Q101 qualification status, thermal resistance (455 K/W), reverse leakage (2 µA at 2 V), and SOT323 terminal mapping for immediate schematic and layout integration.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable 5.1 V reference under varying load and temperature conditions. Its −0.8 mV/K temperature coefficient minimizes drift across −55 °C to +150 °C ambient range, and its 480 Ω dynamic impedance ensures predictable regulation behavior at 5 mA test current.

The device supports surge immunity up to 40 W non-repetitive peak reverse power (tp = 100 µs), and exhibits only 2 µA reverse leakage at VR = 2 V - critical for low-power standby circuits. It is qualified per AEC-Q101 and mounted on FR4 PCB with single-sided copper for thermal performance validation.

Key Specifications

Pinout & Package

SOT323 (SC-70) leadless surface-mount plastic package: 1.35 mm × 1.75 mm footprint, 0.65 mm pitch, 0.9 mm height, optimized for high-density PCB layouts and reflow/wave soldering per IPC-7095.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5231BS-TP and BZX84-C5V1-TP, BZX84W-C5V1-QF uniquely combines AEC-Q101 qualification, 275 mW power rating, and SC-70 footprint-making it the sole choice for space-constrained automotive voltage references requiring production-grade reliability.

Availability

BZX84W-C5V1-QF is available at Aetrix Electronics and suitable for automotive power monitoring, high-frequency bias networks, and industrial sensor conditioning requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BZX84W-C5V1-QF 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-enhancing components, delivering high-volume, high-reliability discrete and logic devices for automotive, industrial, and consumer markets.

BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener portfolio, engineered specifically for robust voltage regulation in automotive ECUs, ADAS modules, and industrial control systems demanding long-term stability and thermal resilience.

FAQ

What is the maximum continuous reverse current the BZX84W-C5V1-QF can sustain?

The device supports a maximum continuous forward current of 200 mA per Absolute Maximum Ratings, but Zener operation relies on controlled reverse current. At 5.1 V regulation, sustained reverse current is limited by power dissipation: I_Z(max) = 275 mW / 5.1 V ≈ 54 mA at 25 °C ambient on FR4 PCB. Derating applies above 25 °C per 455 K/W thermal resistance.

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 serves no electrical role and must remain unconnected in circuit design. While it may provide minor mechanical anchoring during reflow, it contributes no thermal conduction path - thermal performance data assumes standard SOT323 mounting with pins 1 and 3 only.

How does the −0.8 mV/K temperature coefficient impact regulation accuracy over −40 °C to +125 °C?

Over this 165 K range, total Zener voltage drift is approximately −0.8 mV/K × 165 K = −132 mV, or −2.6% of 5.1 V nominal. Combined with ±5% initial tolerance, worst-case V_Z spans 4.54 V to 5.32 V. This is acceptable for non-precision monitoring but insufficient for high-accuracy references without compensation.

Can BZX84W-C5V1-QF replace BZX84-C5V1 in existing designs?

Yes, with verification of layout and thermal constraints. Both share identical electrical specs and SOT323 package, but BZX84W-C5V1-QF adds AEC-Q101 qualification and 275 mW power rating (vs. 300 mW for older BZX84-C5V1). The "W" suffix denotes enhanced automotive qualification; no schematic or footprint changes are needed for drop-in replacement in qualified designs.