Nexperia USA Inc. BZT5250H-B43-QX

Overview

BZT5250H-B43-QX from Nexperia is a low-current Zener diode in SOD123F package, rated for 43 V nominal Zener voltage (±2 % tolerance), 50 µA test current, and 830 mW total power dissipation. It functions as a precision voltage reference or regulator in low-bias circuits, especially in automotive body control modules requiring AEC-Q101-qualified components.

For engineers reviewing the BZT5250H-B43-QX datasheet, BZT5250H-B43-QX pinout, BZT5250H-B43-QX application, or BZT5250H-B43-QX equivalent, this page delivers verified electrical parameters, thermal resistance values, cathode/anode terminal mapping, automotive qualification status, and direct alternative part comparisons with documented differences in leakage and temperature coefficient.

Technical Context

This Zener diode operates at a specified test current of 50 µA - enabling stable regulation in ultra-low-power bias networks where conventional 5 mA Zeners would over-dissipate. Its differential resistance is 375 Ω at I_Z = 5 mA, and its temperature coefficient is +0.05 mV/K, indicating near-zero drift across ambient temperatures.

The device uses an intentional minor rise in leakage current per AN90031 to improve switching speed and reduce noise in feedback paths. Qualified to AEC-Q101, it supports junction temperatures up to 150 °C and features R_th(j-a) = 330 K/W (free air) and R_th(j-sp) = 70 K/W (cathode solder point).

Key Specifications

Pinout & Package

SOD123F surface-mount plastic package: 2.6 mm × 1.6 mm × 1.1 mm body, flat lead, single-sided copper PCB mount, cathode marked by bar.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT5250H-B43-QX, the C43-Q variant trades precision for cost in qualified automotive systems, while MMSZ5263B-TP sacrifices qualification, power rating, and thermal specs for general-purpose use - making the B43-QX the sole choice for AEC-Q101–mandated 43 V reference stability.

Availability

BZT5250H-B43-QX is available at Aetrix Electronics and suitable for automotive body control modules, portable gas detectors, industrial PLC input protection, and smart meter reference subsystems requiring stable component supply with guaranteed AEC-Q101 compliance and traceable lot history.

Supply support for BZT5250H-B43-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 advanced packaging.

The BZT5250H-Q series belongs to Nexperia's AEC-Q101–qualified Zener diode product line, engineered specifically for low-current, high-stability voltage regulation in automotive and industrial environments where precision, thermal robustness, and long-term reliability are critical.

FAQ

What is the maximum reverse voltage this diode can withstand before breakdown?

The BZT5250H-B43-QX has a nominal Zener voltage of 43 V with a guaranteed range of 42.1 V to 43.9 V at 50 µA test current. Its absolute maximum non-repetitive peak reverse voltage is defined by the 40 W surge rating at 100 µs pulse width - not a fixed VR(max) value. Continuous reverse operation must remain within the specified V_Z window under controlled current conditions.

Is this diode suitable for use in a 125 °C under-hood automotive environment?

Yes. The device is qualified to AEC-Q101 and rated for junction temperatures up to 150 °C. With R_th(j-sp) = 70 K/W and proper PCB copper area on the cathode pad, it sustains reliable operation at 125 °C ambient in engine control units and lighting modules when power dissipation remains within derated limits.

How does the "intentional minor rise of leakage current" affect circuit noise?

Per AN90031, the controlled increase in leakage improves carrier recombination dynamics, reducing low-frequency (1/f) noise and enhancing transient response time. This results in cleaner reference voltages for precision ADCs and lower jitter in comparator-based threshold detection circuits - confirmed in Nexperia's application note measurements.

Can this Zener replace a 1N4750A in an existing design?

No. The 1N4750A is a 47 V, 1 W through-hole Zener with 5 mA test current and ±5 % tolerance. BZT5250H-B43-QX is 43 V, SOD123F, 50 µA test current, ±2 %, and AEC-Q101 qualified. Direct substitution would cause incorrect regulation voltage, insufficient power handling, and incompatible footprint - redesign of bias network and layout is required.