Nexperia USA Inc. BZT52H-A3V3X

Overview

BZT52H-A3V3X from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD123F package, delivering 3.3 V nominal breakdown voltage at 5 mA, with 5 Ω typical differential resistance and ≤0.9 V forward voltage at 10 mA, used for precision low-voltage reference and overvoltage clamping in power supply feedback paths.

For engineers reviewing the BZT52H-A3V3X datasheet, BZT52H-A3V3X pinout, BZT52H-A3V3X application, or BZT52H-A3V3X equivalent, this page provides verified Zener parameters, thermal performance on FR4 PCB, cathode/anode terminal mapping, and validated alternatives for 3.3 V regulation in space-constrained industrial and consumer designs.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable 3.3 V output by conducting reverse current above its specified Zener knee voltage. Its ±1 % tolerance and low 5 Ω dynamic impedance ensure tight regulation under varying load conditions.

Designed for surface-mount use on standard FR4 PCBs, it achieves 830 mW total power dissipation with a 70 K/W junction-to-solder-point thermal resistance when mounted with a 1 cm² cathode pad, enabling reliable operation up to 150 °C junction temperature.

Key Specifications

Pinout & Package

SOD123F plastic surface-mounted package: 2-lead, flat lead, small outline; dimensions 3.5 mm × 1.6 mm × 1.1 mm; cathode marked by bar on body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52H-A3V3X, BZT52C3V3 trades tighter tolerance and lower impedance for lower cost, while MMSZ4685 requires PCB redesign and offers significantly reduced power capability-making the A3V3X optimal for new designs demanding precision and thermal robustness in compact layouts.

Availability

BZT52H-A3V3X is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp protection, and low-power sensor biasing requiring stable component supply with guaranteed long-term sourcing.

Supply support for BZT52H-A3V3X 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 consumer markets.

The BZT52H series belongs to Nexperia's general-purpose Zener diode product line, engineered for precision voltage regulation and transient suppression in cost-sensitive, space-constrained surface-mount applications.

FAQ

What is the maximum reverse current the BZT52H-A3V3X can handle continuously?

The device is rated for continuous reverse current up to 250 mA per Absolute Maximum Ratings (Table 5), but practical steady-state operation is limited by thermal constraints: at 25 °C ambient and standard FR4 mounting, 830 mW power dissipation corresponds to ~250 mA only if V_Z remains exactly 3.3 V-designs should limit average current to ≤150 mA to maintain safe junction temperature margins.

Does the SOD123F package require special soldering profiles?

Yes-Nexperia specifies reflow soldering as the only recommended method (Section 12). The SOD123F footprint requires precise stencil-defined solder paste deposits (1.1 mm × 1.2 mm per pad) and peak reflow temperatures not exceeding 260 °C for ≤10 seconds to avoid delamination or marking degradation, with preheat ramp rates controlled to <3 °C/s.

How does temperature affect the 3.3 V Zener voltage?

At I_Z = 5 mA, the temperature coefficient is −3.5 mV/K (Table 8), meaning V_Z decreases by ~3.5 mV per °C rise in junction temperature. Over −40 °C to +125 °C, this results in a total shift of approximately −580 mV, so the actual regulation point ranges from ~3.88 V to ~3.3 V depending on thermal operating point.

Can BZT52H-A3V3X replace older BZX584C3V3 in existing designs?

No-BZX584C3V3 uses SOD-523 package (1.2 mm × 0.8 mm), while BZT52H-A3V3X uses larger SOD123F (3.5 mm × 1.6 mm); the footprints are incompatible. Electrical differences include higher P_tot (830 mW vs. 300 mW) and tighter tolerance (±1 % vs. ±5 %), but mechanical redesign is mandatory for substitution.