Nexperia USA Inc. BZX84W-C68-QF

Overview

BZX84W-C68-QF from Nexperia is a ±5% tolerance Zener diode with 68 V nominal regulation voltage, 275 mW power dissipation, and SOT323 (SC-70) package, designed for precision voltage reference and overvoltage protection in automotive power rails and sensor signal conditioning circuits.

For engineers reviewing the BZX84W-C68-QF datasheet, BZX84W-C68-QF pinout, BZX84W-C68-QF application, or BZX84W-C68-QF equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (455 K/W), differential resistance (475 Ω at I_Z = 2 mA), junction temperature limit (150 °C), and AEC-Q101 qualification status.

Technical Context

This device operates as a reverse-biased voltage reference with a specified Zener voltage of 68 V (min 64.0 V, max 72.0 V at I_Z = 2 mA) and exhibits a positive temperature coefficient of +71.7 mV/K, enabling stable regulation across automotive ambient ranges (−55 °C to +150 °C). Its low 0.25 pF capacitance at 1 MHz supports high-frequency noise suppression.

The diode features non-repetitive peak reverse power dissipation up to 40 W for 100 µs pulses and maintains 50 nA reverse current at VR = 0.7 × V_Znom, ensuring low leakage in standby modes. It is mounted on FR4 PCB with single-sided copper and standard SOT323 footprint per JEDEC MO-203AA.

Key Specifications

Pinout & Package

SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; dimensions per JEDEC MO-203AA: 2.2 mm × 1.35 mm × 0.95 mm, 0.65 mm pitch, tin-plated terminations.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84W-C68-QF, the BZX84W-B68-Q offers tighter voltage control at higher cost and same automotive qualification, while MMSZ5263ET1G provides greater power headroom but lacks automotive validation and uses a larger, less dense package.

Availability

BZX84W-C68-QF is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and smart lighting systems requiring stable component supply with AEC-Q101 assurance and SOT323 space constraints.

Supply support for BZX84W-C68-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 technologies, delivering high-performance logic, discrete, and MOSFET devices with emphasis on automotive and industrial reliability.

The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage regulation in harsh automotive environments including engine control, ADAS, and infotainment subsystems.

FAQ

What is the maximum reverse voltage this Zener can safely clamp in continuous operation?

The BZX84W-C68-QF is rated for continuous reverse operation up to its nominal Zener voltage of 68 V (with ±5% tolerance), and must not exceed 72.0 V under any steady-state condition. Its absolute maximum reverse voltage is defined by the 150 °C junction temperature limit and 275 mW power dissipation on FR4 PCB - exceeding 72 V risks thermal runaway due to increasing leakage current and reduced differential resistance.

Can this diode replace a 68 V TVS for ESD or surge protection?

No - the BZX84W-C68-QF is a precision Zener regulator, not a transient voltage suppressor. While it handles 40 W non-repetitive surges at 100 µs, its 475 Ω differential resistance limits clamping effectiveness during fast transients like IEC 61000-4-2 ESD (nanosecond rise time). Dedicated TVS diodes such as PESD5V0S1BA have sub-ohm dynamic impedance and guaranteed clamping below 15 V at 8 kV contact discharge.

How does the "QF" suffix in the part number affect specifications?

The "QF" suffix denotes Nexperia's automotive-grade variant with full AEC-Q101 qualification, including extended temperature screening (−55 °C to +150 °C), humidity testing (UHAST), and lifetime reliability validation. It shares identical electrical specs and package with non-QF versions but guarantees process consistency, lot traceability, and zero-defect manufacturing controls required for automotive Tier 1 suppliers.

Is the NC pin (Pin 2) electrically isolated or internally bonded?

Pin 2 is confirmed as Not Connected (n.c.) - it is fully electrically isolated with no internal bond wire or silicon connection. The datasheet explicitly states "not connected", and the SOT323 mechanical drawing shows no die attachment or metallization to this terminal. PCB layout must leave Pin 2 unconnected; soldering or routing to ground/power will cause functional failure or short-circuit risk.