Nexperia USA Inc. BZT52H-A30-QX

Overview

BZT52H-A30-QX from Nexperia is a precision Zener voltage regulator diode in SOD123F package, rated for 30 V nominal breakdown voltage at 2 mA test current, ±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-A30-QX datasheet, BZT52H-A30-QX pinout, BZT52H-A30-QX application, or BZT52H-A30-QX equivalent, this part supports stable 30 V regulation in space-constrained automotive ECUs, sensor biasing networks, and power supply feedback loops where tight voltage accuracy and thermal reliability are required.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain a stable reference voltage across its terminals under varying load and temperature conditions. Its differential resistance of 250 Ω at I_Z = 2 mA ensures low dynamic impedance for effective noise suppression and regulation stability.

The device exhibits a temperature coefficient of +0.05 mV/K at I_Z = 2 mA, enabling predictable drift behavior in automotive ambient ranges (−65 °C to +150 °C), and features a non-repetitive peak reverse current rating of 1.0 A for transient surge immunity.

Key Specifications

Pinout & Package

SOD123F is a 2-lead surface-mount plastic package with cathode marked by a bar on the top surface. The device measures 3.4–3.6 mm in length, 2.5–2.7 mm in width, and 0.7–0.9 mm in height, with gull-wing leads spaced 1.5–1.7 mm apart.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52H-A30-QX, the BZT52H-B30-Q trades 1 % accuracy for lower unit cost while retaining automotive qualification, whereas BZX84-C30-Q sacrifices both tolerance and qualification for smaller footprint and reduced power handling-making it unsuitable for automotive or high-stability use cases.

Availability

BZT52H-A30-QX is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor signal conditioning, and power supply overvoltage protection requiring stable component supply with guaranteed AEC-Q101 compliance and traceable lot history.

Supply support for BZT52H-A30-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 technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and mobile markets.

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

FAQ

What is the maximum continuous reverse current the BZT52H-A30-QX can sustain at 30 V?

The device is rated for 250 mA maximum forward current but operates in reverse breakdown; its steady-state reverse current is determined by external circuit design. At 30 V, typical reverse current is negligible (<1 μA below V_Z), and sustained conduction requires current limiting to stay within 830 mW power dissipation-yielding ~27.7 mA at 30 V with full derating.

How does the ±1 % tolerance affect calibration in an ADC reference application?

With ±1 % V_Z tolerance (29.7–30.3 V), the absolute error introduced into a 30 V reference is ±0.3 V. For a 12-bit ADC spanning 0–30 V, this corresponds to ±40.96 LSB error-requiring either factory calibration or software offset correction to achieve sub-LSB accuracy in final measurements.

Can BZT52H-A30-QX replace a TL431-based shunt regulator?

No-it lacks the active feedback, adjustable output, and 2.5 V reference of TL431. BZT52H-A30-QX is a fixed 30 V passive Zener; it cannot regulate dynamically or sink variable current like TL431. It serves only as a simple, low-cost voltage clamp or reference where 30 V is fixed and accuracy requirements align with ±1 %.

Is the SOD123F package compatible with standard reflow profiles for lead-free assembly?

Yes-Nexperia specifies reflow soldering as the only recommended method. The SOD123F package supports JEDEC J-STD-020D-compliant lead-free reflow profiles, with peak temperatures up to 260 °C and time above liquidus of 60–150 seconds, provided the PCB footprint matches the recommended 2.8 × 4.4 mm land pattern with 1.2 mm solder paste deposits per pad.