Nexperia USA Inc. BZT52H-A75X

Overview

BZT52H-A75X from Nexperia is a precision Zener voltage regulator diode in SOD123F package, designed for stable reference and overvoltage protection in low-power circuits. It delivers a nominal 75 V Zener voltage at 2 mA test current, ±1 % tolerance, 400 Ω maximum differential resistance, and supports up to 830 mW total power dissipation at 25 °C ambient.

For engineers reviewing the BZT52H-A75X datasheet, BZT52H-A75X pinout, BZT52H-A75X application, or BZT52H-A75X equivalent, this page provides verified electrical parameters, thermal behavior, real-world use cases, and validated alternative parts for voltage reference design, power rail clamping, and analog signal conditioning.

Technical Context

This device operates in reverse-biased breakdown mode with tightly controlled Zener voltage (74.25 V to 75.75 V), low temperature coefficient (±0.05 mV/K), and minimal capacitance (35 pF at 0 V). Its SOD123F footprint enables high-density PCB layout while maintaining thermal performance via 70 K/W junction-to-solder-point resistance.

The diode exhibits 175 μA maximum reverse leakage at 56.25 V (75 % of VZ), supports non-repetitive 0.20 A surge current (100 μs pulse), and maintains regulation stability across −65 °C to +150 °C operating range - critical for industrial sensor interfaces and power supply feedback networks.

Key Specifications

Pinout & Package

SOD123F is a 2-terminal surface-mount plastic package with 1.2 mm height, 2.5 mm length, and 1.2 mm width. Cathode is marked by a bar on the device body; leads are coplanar and tin-plated for reflow soldering compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZT52H-A75X, the BZT52H-B75 trades 1 % accuracy for cost efficiency without sacrificing thermal or surge capability, while BZX84-C75 sacrifices both precision and ruggedness for footprint reduction - making the A-grade part optimal for high-stability reference and protection roles.

Availability

BZT52H-A75X is available at Aetrix Electronics and suitable for industrial power supplies, telecom voltage supervision, and high-voltage sensor interface circuits requiring stable component supply and long-term lifecycle continuity.

Supply support for BZT52H-A75X 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

The BZT52H series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for precision voltage reference and overvoltage protection in space- and cost-sensitive SMD applications.

FAQ

What is the maximum continuous reverse current the BZT52H-A75X can sustain at 25 °C?

The device does not specify a maximum continuous reverse current; instead, its safe operating area is defined by total power dissipation. At 25 °C ambient, it supports up to 11.07 mA continuous reverse current (830 mW ÷ 75 V) before exceeding thermal limits - assuming ideal heatsinking. Derating applies above 25 °C per the 150 K/W junction-to-ambient thermal resistance.

Can BZT52H-A75X be used in place of a 75 V TVS diode for ESD protection?

No - it is not rated for ESD immunity per IEC 61000-4-2. While it handles 0.20 A non-repetitive surges (100 μs), its clamping voltage rises significantly above V_Z under fast transients, and it lacks specified ESD robustness. Use dedicated TVS diodes like PESD5V0S1BA for ESD protection; reserve BZT52H-A75X for steady-state regulation and slower overvoltage limiting.

How does the ±1 % tolerance affect regulation accuracy across temperature?

The ±1 % initial tolerance combines with a ±0.05 mV/K temperature coefficient. Over −40 °C to +125 °C, the worst-case drift is ±3.3 mV/°C × 165 °C = ±545 mV, yielding total V_Z variation of approximately ±1.7 % relative to nominal 75 V. This remains within typical analog reference requirements for non-precision industrial systems.

Is the SOD123F package compatible with standard reflow soldering profiles?

Yes - Nexperia specifies reflow soldering as the only recommended method. The SOD123F footprint aligns with IPC-7351B standards, and the device withstands peak temperatures up to 260 °C for 10 seconds. Recommended profile includes ramp rate ≤ 3 °C/s, preheat 150–200 °C for 60–120 s, and time above liquidus 60–90 s at 235–245 °C.