Nexperia USA Inc. BZT52H-A68X

Overview

BZT52H-A68X from Nexperia is a precision Zener voltage regulator diode in SOD123F package, designed for stable reference and overvoltage protection in low-power circuits. It provides a nominal 68 V Zener voltage at 2 mA test current, ±1 % tolerance, 80 Ω typical differential resistance, and operates up to 150 °C junction temperature - deployed in power supply feedback loops and I/O rail clamping.

For engineers reviewing the BZT52H-A68X datasheet, BZT52H-A68X pinout, BZT52H-A68X application, or BZT52H-A68X equivalent, key selection criteria include Zener voltage accuracy (±1 %), thermal resistance (150 K/W junction-to-solder point), non-repetitive surge capability (0.25 A at 100 μs), reverse leakage (<0.1 μA at 54.4 V), and SOD123F footprint compatibility with automated SMT assembly.

Technical Context

This device functions as a two-terminal shunt voltage regulator, maintaining a stable 68 V reference by operating in reverse breakdown under controlled current. Its Zener mechanism delivers predictable regulation across ambient temperatures from −65 °C to +150 °C, with a positive temperature coefficient of +0.05 mV/K at I_Z = 2 mA.

The SOD123F package enables surface-mount integration with low thermal resistance (150 K/W to solder point) and supports reflow-only assembly. Electrical behavior is characterized by 80 Ω typical dynamic impedance at 2 mA, <0.1 μA reverse leakage at VR = 54.4 V, and 0.9 V forward voltage at 10 mA.

Key Specifications

Pinout & Package

SOD123F is a 2-pin surface-mount plastic package with cathode-marked flat lead geometry: 3.6 mm × 1.7 mm body, 0.7 mm height, and 0.55 mm lead pitch. The marking bar identifies the cathode terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52H-A68X, BZT52H-B68 trades 1 % accuracy for broader tolerance and lower unit cost, while BZX84-C68 sacrifices power handling and thermal performance for smaller footprint - making the A68X optimal for precision, high-stability, and thermally constrained 68 V regulation.

Availability

BZT52H-A68X is available at Aetrix Electronics and suitable for power supply feedback reference, I/O rail overvoltage clamp, and high-voltage bias network stabilizer applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for BZT52H-A68X 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 delivering high-performance logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for industrial, consumer, and communications markets.

The BZT52H series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for stable voltage reference and overvoltage protection in space-constrained, high-reliability SMT designs.

FAQ

What is the Zener test current for BZT52H-A68X?

The BZT52H-A68X is characterized at 2 mA Zener test current (I_Z = 2 mA), as specified in Table 10 of the datasheet. This current establishes the nominal 67.32 V to 68.68 V breakdown voltage window and is used for measuring differential resistance and temperature coefficient. Operation outside this range affects regulation accuracy and thermal stability.

Can BZT52H-A68X be used in automotive applications?

No - the BZT52H-A68X is explicitly designated as non-automotive qualified per Revision 7 (January 2023) of the datasheet. Nexperia states that automotive alternatives require the "-Q" suffix (e.g., BZT52H-A68X-Q) and undergo separate AEC-Q200 qualification. Using this part in safety-critical or automotive-grade systems voids warranty and violates compliance requirements.

How does the SOD123F package affect thermal performance?

The SOD123F package delivers R_th(j-sp) = 150 K/W (junction-to-solder point) when mounted on FR4 with 1 cm² cathode pad, enabling higher continuous power than SOT23 equivalents. However, its R_th(j-a) = 330 K/W in free air limits derating above 70 °C ambient unless board copper area is increased - thermal design must prioritize cathode pad copper mass and connectivity.

What is the maximum reverse voltage before breakdown?

The maximum rated reverse voltage before Zener conduction begins is 54.4 V - defined as the voltage at which reverse leakage reaches 0.1 μA (Table 10). Applying ≥54.4 V will initiate measurable current flow; full regulation at 68 V requires sufficient series current limiting to sustain ≥2 mA through the diode without exceeding 830 mW dissipation.