Nexperia USA Inc. BZT52H-B5V1-QX

Overview

BZT52H-B5V1-QX from Nexperia is a 5.1 V ±2 % tolerance Zener diode in SOD123F package, rated for 830 mW total power dissipation at 25 °C ambient, with 60 Ω typical differential resistance at I_Z = 5 mA and 2 μA maximum reverse current at V_R = 3.8 V - used for precision voltage regulation and overvoltage protection in automotive body control modules.

For engineers reviewing the BZT52H-B5V1-QX datasheet, BZT52H-B5V1-QX pinout, BZT52H-B5V1-QX application, or BZT52H-B5V1-QX equivalent, this page delivers verified Zener voltage, thermal resistance (R_th(j-sp) = 150 K/W), AEC-Q101 qualification status, and automotive-grade reliability data without generic timing or interface assumptions.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable 5.1 V reference under regulated current conditions, with temperature coefficient of −2.7 mV/K at I_Z = 5 mA and junction-to-solder-point thermal resistance of 150 K/W on FR4 PCB with 1 cm² cathode pad.

It supports non-repetitive peak reverse current up to 6.0 A (t_p = 100 μs) and exhibits 300 pF capacitance at 1 MHz and 0 V reverse bias, enabling use in low-speed voltage clamping and reference circuits where stability across −65 °C to +150 °C ambient is required.

Key Specifications

Pinout & Package

SOD123F surface-mount plastic package: 2-lead, flat lead, small outline; dimensions 3.4–3.6 mm × 2.5–2.7 mm × 1.0–1.2 mm; cathode marked by bar on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52H-B5V1-QX, the ±1 % A-series offers tighter voltage control but sacrifices dynamic regulation performance, while the BZX84-C5V1 trades automotive qualification and thermal efficiency for lower unit cost in non-critical designs.

Availability

BZT52H-B5V1-QX is available at Aetrix Electronics and suitable for automotive body control modules, LED lighting drivers, engine management systems, and infotainment power sequencing requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZT52H-B5V1-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 is designed specifically for automotive voltage regulation and protection, delivering AEC-Q101 compliance, extended temperature operation, and SOD123F packaging optimized for automated assembly and thermal performance in harsh environments.

FAQ

What is the maximum continuous reverse current this Zener can handle at 25 °C ambient?

The BZT52H-B5V1-QX has a maximum total power dissipation of 830 mW at T_amb ≤ 25 °C. With a nominal Zener voltage of 5.1 V, this corresponds to a maximum continuous reverse current of approximately 163 mA (830 mW ÷ 5.1 V), assuming no additional thermal derating from PCB layout or airflow constraints.

Does this part require a heatsink for operation at full power?

No external heatsink is required. When mounted on an FR4 PCB with a 1 cm² cathode pad, its junction-to-solder-point thermal resistance is 150 K/W. At 830 mW dissipation and 25 °C ambient, junction temperature rises by 125 °C (0.83 W × 150 K/W), reaching 150 °C - exactly at the rated maximum, confirming adequate thermal design without added heatsinking.

How does the −2.7 mV/K temperature coefficient affect regulation accuracy over temperature?

At I_Z = 5 mA, the −2.7 mV/K coefficient means the Zener voltage decreases by 2.7 mV per Kelvin rise. Over a 100 K range (−40 °C to +60 °C ambient), this yields a −270 mV shift from nominal 5.1 V - but actual drift is bounded by ±2 % tolerance and measured characteristics show <±15 mV total deviation across −40 °C to +125 °C junction temperature due to curvature compensation.

Can this Zener be used in parallel for higher power handling?

Parallel connection is not recommended. Zener voltage tolerances and temperature coefficients cause unequal current sharing - even two ±2 % units may differ by >100 mV at elevated temperature, leading to thermal runaway in the lower-V_Z device. For higher power, select a single higher-rated Zener or use active regulation instead.