Nexperia USA Inc. BZT52H-A24-QX

Overview

BZT52H-A24-QX from Nexperia is a precision Zener voltage regulator diode in SOD123F package, rated for 24 V nominal breakdown voltage at 5 mA, ±1 % tolerance, 830 mW total power dissipation, and qualified to AEC-Q101 for automotive voltage reference and overvoltage protection circuits.

For engineers reviewing the BZT52H-A24-QX datasheet, BZT52H-A24-QX pinout, BZT52H-A24-QX application, or BZT52H-A24-QX equivalent, this part delivers tight-tolerance regulation in space-constrained automotive ECUs, sensor supply rails, and industrial power monitor circuits where thermal stability and surge robustness are critical.

Technical Context

This Zener diode operates in reverse-bias breakdown mode with a specified V_Z = 23.76–24.24 V at I_Z = 5 mA, differential resistance r_dif ≤ 220 Ω, and temperature coefficient S_Z = +0.05 mV/K - indicating near-zero drift across operating temperature. It supports non-repetitive peak reverse current up to 1.25 A (100 μs pulse) and maintains stable regulation under ambient temperatures from −65 °C to +150 °C.

The device uses planar epitaxial construction for low noise and high reliability, with cathode-anode polarity clearly marked by a bar on the SOD123F body. Its thermal resistance from junction to solder point is 70 K/W, enabling effective heat transfer when mounted on a 1 cm² cathode pad per Nexperia's layout recommendation.

Key Specifications

Pinout & Package

SOD123F surface-mount plastic package: 2-terminal, flat lead, 3.4–3.6 mm length × 1.5–1.7 mm width × 0.9–1.0 mm height; cathode marked by bar on body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52H-B24-Q and MMSZ5245B-TP, the BZT52H-A24-QX uniquely combines ±1 % precision, AEC-Q101 validation, and 1.25 A transient handling - making it the sole choice for ASIL-compliant 24 V reference design where measurement integrity and field reliability are non-negotiable.

Availability

BZT52H-A24-QX is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor signal conditioners, and medical diagnostic equipment requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZT52H-A24-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 logic, discrete, and MOSFET solutions, with leadership in automotive-qualified components and advanced packaging.

The BZT52H-Q series belongs to Nexperia's automotive-grade Zener diode product line, engineered specifically for precision voltage reference and transient protection in harsh-environment electronic control modules.

FAQ

What is the maximum reverse voltage before breakdown for BZT52H-A24-QX?

The guaranteed minimum breakdown voltage is 23.76 V at 5 mA test current, with maximum 24.24 V. At 19.2 V reverse bias, leakage remains ≤ 30 μA - confirming stable non-conducting behavior below the specified V_Z window. This margin ensures reliable clamping action without premature conduction in 24 V systems.

Can BZT52H-A24-QX replace a 24 V Zener in an existing AEC-Q200 compliant design?

Yes - BZT52H-A24-QX is AEC-Q101 qualified, exceeding AEC-Q200's passive component requirements. Its 150 °C junction rating, −65 °C to +150 °C operating range, and validated thermal resistance (70 K/W to solder point) ensure compatibility with AEC-Q200 thermal and environmental stress profiles when mounted per Nexperia's SOD123F footprint guidelines.

How does the ±1 % tolerance impact circuit accuracy compared to ±5 % alternatives?

At 24 V, ±1 % yields ±0.24 V absolute error versus ±1.2 V for ±5 %. In a 12-bit ADC reference application, this reduces quantization uncertainty by 4× - directly improving measurement resolution from ~5 mV to ~1.2 mV per LSB. The tighter tolerance also eliminates need for software calibration in many automotive sensor interfaces.

Is the SOD123F package compatible with standard reflow soldering profiles?

Yes - Nexperia specifies reflow soldering as the only recommended method. The SOD123F outline supports JEDEC J-STD-020 moisture sensitivity level 1 (unlimited floor life), and its thermal mass aligns with standard lead-free peak profiles (260 °C, 30 s max). Footprint dimensions (2.9 × 1.6 mm pads, 1.1 mm spacing) match IPC-7351B recommendations for reliable joint formation.