Nexperia USA Inc. BZX84W-C7V5-QX

Overview

BZX84W-C7V5-QX from Nexperia is a ±5% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 7.5 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides stable voltage reference in low-power regulation circuits, ESD protection clamping, and biasing networks where compact size and thermal reliability are critical.

For engineers reviewing the BZX84W-C7V5-QX datasheet, BZX84W-C7V5-QX pinout, BZX84W-C7V5-QX application, or BZX84W-C7V5-QX equivalent, this page delivers verified Zener parameters, automotive-grade qualification status, SOT323 terminal mapping, and real-world regulation use cases - all extracted from Nexperia's official Rev. 1 product data sheet dated 19 November 2021.

Technical Context

This device operates as a reverse-biased Zener diode with a nominal 7.5 V breakdown voltage at I_Z = 5 mA, differential resistance of 80 Ω (max), and positive temperature coefficient of +4.0 mV/K at 5 mA. Its low 1 µA reverse current at V_R = 5 V ensures minimal leakage in standby regulation paths.

Designed for surface-mount applications on FR4 PCBs with single-sided copper, it achieves 455 K/W junction-to-ambient thermal resistance and supports non-repetitive surge pulses up to 40 W (100 µs). The SOT323 package enables high-density placement while maintaining AEC-Q101 compliance for under-hood and infotainment subsystems.

Key Specifications

Pinout & Package

SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; dimensions per Figure 8 (0.1 mm A1 max, 2.2 mm D, 1.35 mm E, 0.65 mm e); reflow footprint per Figure 9.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84W-C7V5-QX, the BZX84W-B7V5-Q offers tighter initial tolerance for metrology-critical references, while the MMSZ5236B-TP trades automotive qualification and miniaturization for higher power capacity and broader industry adoption - making the QX variant optimal for space-constrained, thermally demanding automotive subsystems.

Availability

BZX84W-C7V5-QX is available at Aetrix Electronics and suitable for automotive cabin electronics, industrial sensor interfaces, consumer audio power sequencing, and medical wearable battery monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BZX84W-C7V5-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.

The BZX84W-Q series belongs to Nexperia's automotive-grade Zener diode product line, engineered specifically for robust voltage regulation and clamping in harsh-environment electronic control units and safety-critical subsystems.

FAQ

What is the maximum continuous Zener current for BZX84W-C7V5-QX at 25 °C?

The maximum continuous Zener current is derived from P_tot = 275 mW and V_Z ≈ 7.5 V, yielding I_Z(max) ≈ 36.7 mA. However, the datasheet specifies 200 mA as the absolute maximum forward current (IF), and limits Zener operation to currents ensuring junction temperature remains ≤150 °C - typical design practice uses ≤10 mA for long-term reliability on FR4 PCBs.

Is pin 2 electrically functional or a mechanical dummy lead?

Pin 2 is explicitly designated "n.c." (not connected) in Table 2 and the simplified outline graphic. It is an internal dummy lead with no electrical connection to the die; PCB layout must leave it unconnected - no trace, pad, or solder mask relief is required or recommended.

How does the +4.0 mV/K temperature coefficient affect regulation accuracy over −40 °C to +125 °C?

Over this 165 K range, the Zener voltage shifts by +4.0 mV/K × 165 K = +660 mV - from ~7.0 V at −40 °C to ~7.66 V at +125 °C. This 9.3% drift is inherent to 7.5 V Zeners and must be accommodated in system-level tolerance budgets; compensation techniques (e.g., complementary diodes) are not integrated into this discrete device.

Can BZX84W-C7V5-QX replace BZX84-C7V5 in existing SOT23 designs?

No - BZX84W-C7V5-QX uses SOT323 (SC-70), which has smaller dimensions (2.2 × 1.35 mm) and different pin pitch (0.65 mm) than SOT23 (2.9 × 1.3 mm, 0.95 mm pitch). Direct replacement requires PCB redesign; the SOT323 footprint is incompatible with SOT23 land patterns and stencil apertures.