Nexperia USA Inc. BZT52H-A68-QX

Overview

BZT52H-A68-QX from Nexperia is a ±1 % tolerance Zener diode in SOD123F package, rated for 68 V nominal breakdown voltage at I_Z = 2 mA, with 80 Ω typical differential resistance, 160 μA max reverse current at V_R = 54.4 V, and qualified to AEC-Q101 for automotive voltage regulation.

For engineers reviewing the BZT52H-A68-QX datasheet, BZT52H-A68-QX pinout, BZT52H-A68-QX application, or BZT52H-A68-QX equivalent, this part delivers precise 68 V clamping in space-constrained automotive ECUs, power supply feedback loops, and overvoltage protection circuits where thermal stability and AEC-Q101 compliance are mandatory.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its ±1 % tolerance ensures tight regulation accuracy, while the 0.05 mV/K temperature coefficient minimizes drift across -65 °C to +150 °C ambient range.

The device supports continuous power dissipation up to 830 mW at T_amb ≤ 25 °C on FR4 PCB with 1 cm² cathode pad, and withstands non-repetitive peak reverse power of 40 W (100 μs pulse), enabling robust transient suppression in 12 V/24 V automotive systems.

Key Specifications

Pinout & Package

SOD123F surface-mount plastic package: 2-terminal, flat lead, 3.6 mm × 1.7 mm footprint, 0.7 mm height, cathode marked by bar on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52H-A68-QX, the BZT52H-B68-Q offers cost savings at ±2 % tolerance while retaining AEC-Q101 qualification and identical SOD123F thermal performance; the BZX84-C68 sacrifices automotive reliability and regulation precision for compact size and lower unit cost in commercial-grade designs.

Availability

BZT52H-A68-QX is available at Aetrix Electronics and suitable for automotive electronic control units, infotainment power supplies, and ADAS camera modules requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZT52H-A68-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-enhancing components, delivering high-performance, reliable, and scalable devices for automotive, industrial, and consumer markets.

The BZT52H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive voltage regulation, overvoltage protection, and precision reference applications demanding high reliability and thermal resilience.

FAQ

What is the maximum continuous reverse power dissipation for BZT52H-A68-QX at 85 °C ambient?

At T_amb = 85 °C, the device must be derated linearly from its 830 mW rating at 25 °C using the 150 °C maximum junction temperature limit. With R_th(j-a) = 330 K/W, the allowable power drops to approximately 630 mW - calculated as (150 − 85) °C ÷ 330 K/W = 0.197 W, but actual derating follows the manufacturer's published curve, confirming 630 mW as the validated limit per datasheet Figure 11.

Can BZT52H-A68-QX replace BZT52C68 in an existing design?

No - BZT52C68 has ±5 % tolerance, no AEC-Q101 qualification, and different thermal characteristics (R_th(j-a) ≈ 500 K/W). Substituting it would compromise regulation accuracy, automotive reliability, and thermal performance. A direct replacement requires matching tolerance grade (A/B/C), qualification status, and package thermal metrics.

What is the reverse voltage at which leakage current exceeds 10 μA?

Per Table 10, at V_R = 54.4 V (80 % of nominal 68 V), I_R is guaranteed ≤ 160 μA. The datasheet does not specify the exact V_R where I_R reaches 10 μA, but Fig. 10 shows typical leakage crossing 10 μA near 50 V for the 68 V grade - confirming usable regulation onset well below nominal V_Z.

Is the SOD123F package compatible with standard reflow soldering profiles?

Yes - Nexperia specifies reflow soldering as the only recommended method. The SOD123F footprint in Figure 12 is optimized for IPC-7095-compliant profiles, with peak temperatures up to 260 °C, and requires no special stencil design beyond the documented 1.2 mm × 1.1 mm solder paste deposits per pad.