Nexperia USA Inc. BZX384-B62Z

Overview

BZX384-B62Z from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 62 V nominal breakdown voltage at 2 mA test current, 300 mW total power dissipation, and 150 °C maximum junction temperature. It serves as a precision reference or overvoltage clamp in low-power analog circuits, power supply feedback paths, and sensor signal conditioning.

For engineers reviewing the BZX384-B62Z datasheet, BZX384-B62Z pinout, BZX384-B62Z application, or BZX384-B62Z equivalent, key selection criteria include its 62 V Zener voltage with ±2 % tolerance, 150 Ω typical differential resistance at 2 mA, <0.5 μA reverse leakage at 49.6 V, and thermal resistance of 110 K/W from junction to solder point - all critical for stable voltage reference design in space-constrained PCB layouts.

Technical Context

This device operates as a two-terminal silicon Zener diode, conducting in reverse bias once the applied voltage reaches its specified breakdown threshold. Its regulation relies on controlled avalanche breakdown for voltages ≥6.2 V, delivering predictable clamping behavior under DC or transient conditions.

Designed for surface-mount use on FR4 PCBs with standard tin-plated copper, it supports pulsed operation up to 40 W non-repetitive peak reverse power (100 μs pulse), while maintaining ≤300 mW steady-state dissipation at Tamb ≤25 °C.

Key Specifications

Pinout & Package

The BZX384-B62Z is housed in a SOD323 (SC-76) plastic surface-mount package measuring 1.8 mm × 1.35 mm × 0.95 mm, with cathode marked by a bar on the top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B62Z, MMBZ5262B offers higher power headroom but sacrifices precision and board space efficiency, while BZX384-C62 matches the footprint and power rating but trades regulation accuracy and low-impedance performance for lower unit cost.

Availability

BZX384-B62Z is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and microcontroller-based control systems requiring stable component supply and long-term obsolescence management.

Supply support for BZX384-B62Z 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 system functionality, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

The BZX384 series belongs to Nexperia's precision Zener diode product line, engineered specifically for compact, low-power voltage reference and clamping applications where tight tolerance, thermal stability, and SMD manufacturability are critical.

FAQ

What is the maximum continuous reverse current the BZX384-B62Z can sustain?

The BZX384-B62Z has no specified maximum continuous reverse current beyond its 300 mW power limit. At 62 V, this corresponds to approximately 4.8 mA (300 mW ÷ 62 V). Exceeding this current continuously risks exceeding the 150 °C junction temperature limit, especially without adequate PCB copper heatsinking.

Does the BZX384-B62Z require a series current-limiting resistor in all applications?

Yes - a series resistor is mandatory to limit reverse current and prevent thermal runaway. For example, with a 70 V source and 62 V Zener, a minimum 1.6 kΩ resistor is required to keep power dissipation below 300 mW at full current. The resistor value must be selected based on worst-case supply voltage and desired operating current.

How does the temperature coefficient affect regulation accuracy over −40 °C to +125 °C?

At 62 V, the BZX384-B62Z exhibits a positive temperature coefficient of +12.5 mV/K. Over a 165 °C range, this produces ~2.06 V drift. In precision references, this must be compensated via circuit topology (e.g., complementary diodes) or calibrated out in software, as the ±2 % initial tolerance does not cover thermal drift.

Can the BZX384-B62Z replace a 1N4742A in existing designs?

No - the 1N4742A is a 12 V, 1 W through-hole Zener. BZX384-B62Z is a 62 V, 300 mW SMD device with different voltage, power, package, and thermal characteristics. Direct replacement would cause catastrophic overvoltage or insufficient regulation. A true drop-in substitute requires matching voltage, power, package, and tolerance.