Nexperia USA Inc. BZT52H-C51-QX

Overview

BZT52H-C51-QX from Nexperia is a ±5 % tolerance Zener diode in SOD123F package, rated for 51 V nominal breakdown voltage at I_Z = 2 mA, with 830 mW total power dissipation and AEC-Q101 qualification for automotive voltage regulation and overvoltage clamping.

For engineers reviewing the BZT52H-C51-QX datasheet, BZT52H-C51-QX pinout, BZT52H-C51-QX application, or BZT52H-C51-QX equivalent, this part supports precision reference generation, ECU supply rail stabilization, and transient suppression in engine control modules where tight voltage tolerance and automotive-grade reliability are required.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain stable DC voltage across its terminals under varying load and temperature conditions. Its differential resistance of 350 Ω at I_Z = 2 mA and temperature coefficient of +0.05 mV/K ensure predictable regulation behavior in automotive ambient ranges (−65 °C to +150 °C).

Designed for surface-mount use on FR4 PCBs with single-sided copper, it delivers 51 V regulation with ≤100 μA reverse leakage at VR = 48 V and supports non-repetitive surge currents up to 0.4 A (tp = 100 μs), making it suitable for transient protection in 12 V/24 V vehicle subsystems.

Key Specifications

Pinout & Package

SOD123F surface-mount plastic package: 2-terminal, flat lead, cathode-marked with bar; dimensions 3.6 × 1.7 × 1.0 mm (L × W × H); optimized for reflow soldering on FR4 PCBs with defined solder land pattern.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52H-C51-QX, the BZT52H-B51-Q offers improved regulation accuracy and lower leakage at the expense of cost, while MMBZ5251BS-7-F sacrifices power handling and thermal robustness for miniaturization-making the C-series optimal for cost-sensitive, thermally demanding automotive clamping.

Availability

BZT52H-C51-QX is available at Aetrix Electronics and suitable for automotive ECU design, infotainment system protection, and body control module voltage regulation requiring stable component supply and AEC-Q101 compliance.

Supply support for BZT52H-C51-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 logic, discrete, and MOSFET solutions, with leadership in automotive-qualified components.

The BZT52H-Q series belongs to Nexperia's automotive Zener portfolio, engineered specifically for voltage regulation and transient suppression in harsh-temperature vehicle environments where long-term parametric stability is essential.

FAQ

What is the maximum continuous reverse current this Zener can handle at 51 V?

The BZT52H-C51-QX is not rated for continuous reverse current at 51 V; it operates in breakdown only under controlled bias. At V_R = 48 V, reverse leakage is ≤100 μA. Continuous conduction at full V_Z must be limited by external series resistance to keep power within 830 mW and junction temperature below 150 °C.

Can this diode replace a 5.1 V Zener in a logic-level shifter?

No. The BZT52H-C51-QX has a 51 V breakdown voltage and is unsuitable for 5.1 V logic interfaces. Using it would prevent proper clamping or regulation at low voltages and risk damage due to excessive forward current if incorrectly biased. Select a BZT52H-C5V1-Q or equivalent for 5.1 V applications.

How does the ±5 % tolerance affect regulation accuracy in temperature-varying environments?

At 51 V nominal, ±5 % tolerance means V_Z spans 48.0–54.0 V at 25 °C. With a temperature coefficient of +0.05 mV/K, the actual voltage shift over −40 °C to +125 °C adds ±8.25 mV, resulting in a total variation of approximately ±2.65 V - acceptable for non-critical clamping but insufficient for precision references.

Is the SOD123F package compatible with standard reflow profiles for lead-free assembly?

Yes. Nexperia specifies reflow soldering as the only recommended method for SOD123F. The package supports JEDEC J-STD-020-compliant lead-free reflow profiles, with peak temperatures up to 260 °C. Thermal resistance data assumes mounting on FR4 with specified 1 cm² cathode pad, confirming compatibility with industrial PCB assembly processes.