Nexperia USA Inc. BZX79-B3V9,133

Overview

BZX79-B3V9,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal 3.9 V breakdown voltage at 5 mA test current, 400–600 Ω differential resistance, and −2.5 mV/K temperature coefficient. Housed in a hermetically sealed SOD27 (DO-35) glass package, it delivers stable low-voltage reference in space-constrained analog power rails and sensor biasing circuits.

For engineers reviewing the BZX79-B3V9,133 datasheet, BZX79-B3V9,133 pinout, BZX79-B3V9,133 application, or BZX79-B3V9,133 equivalent, this page provides verified electrical parameters, thermal limits, reverse leakage behavior at VR = 1 V (≤3 μA), and direct substitution guidance for ±2% Zener references in industrial and consumer power management designs.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining a stable 3.82–3.98 V reverse breakdown across its cathode-anode terminals under 5 mA test current. Its negative temperature coefficient (−2.5 mV/K) enables predictable drift compensation in temperature-sensitive references.

Designed for low-power stabilization, it supports continuous dissipation up to 400 mW at Tamb = 50 °C (unmetallized PCB) and withstands non-repetitive 40 W surge pulses (tp = 100 μs). Junction-to-ambient thermal resistance is 380 K/W, limiting steady-state operation to ≤150 °C junction temperature.

Key Specifications

Pinout & Package

Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a colored band. Dimensions: D = 1.85 mm max., L = 25.4 mm min., b = 0.56 mm max. Lead spacing accommodates standard through-hole PCB layouts.

Key Features

Applications

Availability

BZX79-B3V9,133 is available at Aetrix Electronics and suitable for microcontroller reset circuits, sensor bias references, low-voltage clamping, and ADC reference stabilization requiring stable component supply with guaranteed traceable sourcing and lifecycle continuity.

Supply support for BZX79-B3V9,133 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 leader in discrete semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, high-reliability components for automotive, industrial, and consumer applications.

The BZX79 series belongs to Nexperia's legacy Zener diode portfolio, engineered for cost-effective, stable voltage regulation in low-power analog and power management circuits where precision and long-term reliability are critical.

FAQ

What is the maximum continuous power dissipation for BZX79-B3V9,133?

The BZX79-B3V9,133 dissipates up to 400 mW continuously when mounted on an unmetallized PCB at ambient temperature ≤50 °C (per IEC 60134 limiting values). At 50 °C ambient with 8 mm lead length, junction temperature remains within safe operating limits up to this power level.

How does the −2.5 mV/K temperature coefficient affect circuit performance?

The −2.5 mV/K coefficient means the Zener voltage decreases by approximately 2.5 mV per Kelvin rise in junction temperature. This predictable drift allows designers to compensate reference accuracy in temperature-critical applications using matched components or calibration algorithms.

Is BZX79-B3V9,133 compatible with automated through-hole assembly?

Yes - its SOD27 (DO-35) axial package features standardized lead spacing and diameter, supporting wave soldering and selective soldering processes. The hermetic glass body withstands typical reflow and cleaning chemistries used in industrial PCB assembly lines.

What is the reverse leakage current specification at 1 V?

At VR = 1 V and Tj = 25 °C, the maximum reverse leakage current is 3 μA. This low leakage ensures minimal current draw in high-impedance bias networks and preserves battery life in always-on sensor nodes.