Nexperia USA Inc. BZT52H-A20X

Overview

BZT52H-A20X from Nexperia is a ±1 % tolerance Zener diode in SOD123F package, rated for 20 V nominal breakdown voltage at I_Z = 5 mA, with 830 mW total power dissipation and 220 Ω maximum differential resistance. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.

For engineers reviewing the BZT52H-A20X datasheet, BZT52H-A20X pinout, BZT52H-A20X application, or BZT52H-A20X equivalent, this page delivers verified electrical parameters, thermal behavior under PCB mounting conditions, real-world Zener voltage stability across temperature, and direct-fit alternatives for supply continuity and design flexibility.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse bias above its specified Zener voltage (V_Z = 19.8–20.2 V) with tightly controlled differential resistance (r_dif ≤ 220 Ω) and low temperature coefficient (S_Z = +14 mV/K at I_Z = 5 mA). Its SOD123F package enables high-density surface-mount placement while maintaining thermal performance via defined solder pad geometry.

It is characterized under standardized test conditions: T_j = 25 °C, pulse testing (t_p ≤ 300 μs), and mounted on FR4 PCB with single-sided copper and tin-plated finish. Reverse current remains ≤ 0.1 μA at V_R = 15.2 V, supporting stable regulation in low-leakage applications.

Key Specifications

Pinout & Package

SOD123F surface-mount plastic package: 2.5–2.7 mm length × 1.5–1.7 mm width × 0.9–1.1 mm height; cathode marked by bar on top surface; optimized for reflow soldering per IPC-7095 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52H-A20X, BZT52H-B20 trades 0.2 % tolerance for lower unit cost without sacrificing thermal or surge capability, while MMSZ5248B offers broader availability but sacrifices precision, power handling, and thermal performance-making it unsuitable for high-accuracy or high-reliability use cases.

Availability

BZT52H-A20X is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection, and analog signal conditioning requiring stable component supply and consistent ±1 % Zener voltage performance.

Supply support for BZT52H-A20X 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 manufacturing certified to ISO 9001 and IATF 16949 standards.

The BZT52H series targets general-purpose voltage regulation in consumer, industrial, and computing applications, emphasizing precision, thermal robustness, and SMD manufacturability over automotive-grade qualification.

FAQ

What is the maximum continuous reverse current for BZT52H-A20X at 25 °C?

The device does not specify a maximum continuous reverse current; instead, it defines Zener test current (I_Z = 5 mA) and limiting values including maximum total power dissipation (830 mW). At 20 V, this corresponds to a theoretical steady-state reverse current limit of 41.5 mA, but practical operation should remain below 5 mA to maintain regulation accuracy and avoid thermal runaway.

Can BZT52H-A20X be used in place of a 20 V Zener with ±5 % tolerance?

Yes, it can replace ±5 % Zeners in applications requiring improved accuracy, provided the circuit accommodates its tighter tolerance and lower differential resistance. However, its higher cost and stricter thermal layout requirements (e.g., 1 cm² cathode pad) must be evaluated-especially if the original design relied on looser voltage margins for margin stacking.

How does the SOD123F package affect thermal performance compared to DO-35 or SOD-123?

SOD123F features flattened leads and optimized pad geometry, achieving R_th(j-sp) = 70 K/W-20 % lower than standard SOD-123 (≈85 K/W) and significantly better than DO-35 (≈200 K/W). This enables higher power density in compact layouts but requires strict adherence to the recommended reflow footprint to realize the specified thermal resistance.

Is BZT52H-A20X qualified for automotive applications?

No. Per Nexperia's revision history (Rev. 7, Jan 2023), the BZT52H series is explicitly designated as non-automotive qualified. Automotive alternatives are available under the BZT52H-Q series, which undergo AEC-Q101 stress testing and include extended temperature screening and failure analysis reporting.