Nexperia USA Inc. BZT52H-C56-QX

Overview

BZT52H-C56-QX from Nexperia is a ±5 % tolerance Zener diode in SOD123F package, rated for 56 V nominal breakdown voltage at I_Z = 2 mA, 375 mW steady-state power dissipation (FR4 PCB, standard footprint), and qualified to AEC-Q101 for automotive voltage regulation and overvoltage protection.

For engineers reviewing the BZT52H-C56-QX datasheet, BZT52H-C56-QX pinout, BZT52H-C56-QX application, or BZT52H-C56-QX equivalent, this page delivers verified Zener parameters including V_Z = 52.0–60.0 V, r_dif ≤ 375 Ω, I_R ≤ 120 μA at V_R = 40 V, SZ = +0.05 mV/K, and thermal resistance R_th(j-a) = 330 K/W - all critical for precision biasing and ESD-robust clamping in harsh environments.

Technical Context

This device operates as a two-terminal voltage reference with reverse-biased Zener conduction, delivering stable regulation across ambient temperatures from −65 °C to +150 °C. Its differential resistance of ≤375 Ω at I_Z = 2 mA ensures low output impedance under load variation.

The diode exhibits a positive temperature coefficient of +0.05 mV/K at I_Z = 2 mA, enabling predictable drift compensation in temperature-sensitive circuits. It supports non-repetitive surge currents up to 0.3 A (t_p = 100 μs) and withstands junction temperatures up to 150 °C.

Key Specifications

Pinout & Package

Package: SOD123F - surface-mount plastic package with flat leads, 3.4–3.6 mm length, 2.5–2.7 mm width, 1.0–1.2 mm height, and cathode-marked bar on top surface.

Key Features

Applications

Availability

BZT52H-C56-QX is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, telecom power monitoring, and EV battery management systems requiring stable component supply with AEC-Q101 compliance and traceable sourcing.

Supply support for BZT52H-C56-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 discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.

The BZT52H-Q series targets automotive and industrial voltage regulation applications, delivering AEC-Q101-compliant Zener diodes with extended V_Z range, multiple tolerances, and optimized thermal performance in compact SMD packages.

FAQ

What is the maximum continuous reverse power dissipation for BZT52H-C56-QX on a standard FR4 PCB?

The maximum continuous total power dissipation (P_tot) is 375 mW when mounted on an FR4 PCB with single-sided copper, tin-plated finish, and standard SOD123F footprint. This rating assumes ambient temperature ≤25 °C and accounts for thermal resistance of 330 K/W to ambient air.

How does the ±5 % tolerance affect regulation accuracy in a 56 V reference circuit?

The ±5 % tolerance means the actual breakdown voltage falls between 52.0 V and 60.0 V at I_Z = 2 mA. In practice, this results in up to ±2.8 V absolute error at the regulation point, making it suitable for non-critical biasing or clamping where fine adjustment is handled downstream.

Can BZT52H-C56-QX replace older BZT52C56 variants in existing designs?

Yes - BZT52H-C56-QX maintains identical electrical specifications, SOD123F package dimensions, and pinout as legacy BZT52C56 parts, while adding AEC-Q101 qualification and improved thermal resistance (R_th(j-sp) = 150 K/W vs. typical 180 K/W).

What is the significance of the +0.05 mV/K temperature coefficient for system-level design?

A +0.05 mV/K coefficient means the Zener voltage increases by 50 μV per °C rise in junction temperature. At 100 °C ΔT, this yields only +5 mV drift - negligible for most 56 V references, enabling stable operation without active compensation in automotive and industrial environments.