Nexperia USA Inc. BZT52H-A6V8-QX

Overview

BZT52H-A6V8-QX from Nexperia is a precision Zener voltage regulator diode in SOD123F package, rated for 6.8 V nominal breakdown voltage at 5 mA, ±1 % tolerance, 830 mW total power dissipation, and qualified to AEC-Q101 for automotive power rail stabilization and overvoltage clamping.

For engineers reviewing the BZT52H-A6V8-QX datasheet, BZT52H-A6V8-QX pinout, BZT52H-A6V8-QX application, or BZT52H-A6V8-QX equivalent, this device supports low-thermal-resistance voltage reference design in space-constrained automotive ECUs, sensor signal conditioning circuits, and industrial power supply feedback paths where tight regulation and high surge immunity are required.

Technical Context

This Zener diode operates in reverse-biased breakdown mode with a typical differential resistance of 8 Ω at 5 mA, temperature coefficient of +1.2 mV/K (positive slope), and reverse current ≤2 μA at 5.44 V. It delivers stable regulation under ambient temperatures from −65 °C to +150 °C and junction temperatures up to 150 °C.

Designed for surface-mount reflow soldering on FR4 PCBs, it achieves R_th(j-sp) = 70 K/W to cathode solder point and supports non-repetitive peak reverse current of 6.0 A (100 μs pulse), enabling robust transient suppression in 12 V automotive systems.

Key Specifications

Pinout & Package

SOD123F surface-mount plastic package: 2-terminal, flat lead, 3.6 mm × 1.2 mm footprint, cathode marked by bar on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52H-A6V8-QX, BZT52B6V8-Q trades regulation accuracy for lower cost, while MMSZ4689T1G lacks both AEC-Q101 validation and sufficient power handling for automotive use-making the -A6V8-QX the sole option meeting full functional safety and thermal performance requirements in production ECUs.

Availability

BZT52H-A6V8-QX is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioners, infotainment power sequencers, and smart lighting driver feedback circuits requiring stable component supply with guaranteed long-term continuity.

Supply support for BZT52H-A6V8-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 BZT52H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for voltage regulation and transient protection in harsh automotive environments where precision, surge resilience, and thermal stability are critical.

FAQ

What is the maximum continuous reverse voltage this Zener can regulate at 6.8 V?

The BZT52H-A6V8-QX maintains regulation at 6.8 V nominal with ±1 % tolerance (6.73 V to 6.87 V) at I_Z = 5 mA. Its absolute maximum reverse voltage before breakdown is not defined; instead, it operates within its specified Zener region up to 830 mW dissipation at T_amb ≤ 25 °C, derating linearly above that temperature.

How does the +1.2 mV/K temperature coefficient affect circuit performance?

The +1.2 mV/K coefficient means the Zener voltage increases by approximately 1.2 mV per degree Celsius rise in junction temperature. At 100 °C ΔT, this yields +120 mV shift - a known, linear drift that can be compensated in feedback networks or leveraged to offset negative TC components like LEDs or op-amps in sensor interfaces.

Can this diode replace older BZT52C6V8 variants in existing designs?

Yes, but with key improvements: BZT52H-A6V8-QX offers tighter ±1 % tolerance (vs. ±5 % for -C grade), lower 8 Ω dynamic impedance (vs. ~200 Ω), and AEC-Q101 qualification. Layout remains identical (SOD123F), but thermal and electrical performance upgrades may require minor loop stability review in feedback circuits.

What PCB layout practices maximize thermal performance?

To optimize thermal performance, use ≥1 cm² copper pad connected to the cathode (Pin 1) on inner or outer layer, tin-plated, single-sided FR4 board. Avoid thermal relief spokes; ensure solder mask opening matches pad size. Reflow profile must follow Nexperia's SOD123F recommendations - no wave soldering permitted.