Nexperia USA Inc. BZX84-B27/DG/B2,21

Overview

BZX84-B27/DG/B2,21 from Nexperia is a surface-mount 27 V Zener diode with 250 mW power dissipation, ±2% voltage tolerance, and 100 nA maximum reverse leakage at rated voltage, used for precision voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the BZX84-B27/DG/B2,21 datasheet, BZX84-B27/DG/B2,21 pinout, BZX84-B27/DG/B2,21 application, or BZX84-B27/DG/B2,21 equivalent, key selection criteria include Zener voltage accuracy, thermal stability, SOT23 package compatibility, and low-leakage performance in biasing and reference applications.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable 27 V reference across its terminals under specified current conditions (Iz = 5 mA). Its temperature coefficient of +5.5 mV/K ensures predictable drift behavior over -65 °C to +150 °C operating range.

The device uses planar epitaxial technology for consistent parametric control and low noise performance. It is characterized with a dynamic impedance of 75 Ω at Iz = 5 mA, supporting stable regulation in feedback networks and voltage clamp configurations.

Key Specifications

Pinout & Package

SOT23-3 surface-mount plastic package with standard anode-cathode-anode terminal configuration; compact 2.9 × 1.3 × 1.0 mm body height supports high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C27,215 and MMSZ5258B-TP, the BZX84-B27/DG/B2,21 delivers tighter voltage tolerance and lower leakage in the same SOT23 footprint-critical for high-accuracy, space-constrained analog references.

Availability

BZX84-B27/DG/B2,21 is available at Aetrix Electronics and suitable for industrial sensor biasing, automotive ECU reference design, and portable medical instrumentation requiring stable component supply and long-term traceability.

Supply support for BZX84-B27/DG/B2,21 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 for automotive, industrial, and consumer markets.

The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered for stable voltage reference and clamping in space-constrained, thermally demanding applications.

FAQ

What is the maximum reverse current (Iz) for stable regulation?

The BZX84-B27/DG/B2,21 achieves nominal 27 V regulation at Iz = 5 mA, with stable operation maintained between 1 mA and 20 mA. Regulation degrades outside this range due to increased Zz and thermal effects; operation below 1 mA increases sensitivity to leakage-induced error.

Can this Zener be used in series with another for higher voltage reference?

Yes-two BZX84-B27/DG/B2,21 devices in series yield ~54 V with matched ±2% tolerance, but thermal tracking must be ensured via adjacent layout. Individual unit variation may cause imbalance; parallel use is not recommended due to mismatched knee characteristics.

Is the SOT23-3 package lead-free and RoHS compliant?

Yes-the BZX84-B27/DG/B2,21 is manufactured with lead-free terminations and fully complies with RoHS Directive 2011/65/EU and REACH SVHC regulations, verified per Nexperia's official compliance documentation dated Q2 2023.

How does temperature affect regulation accuracy in continuous operation?

At 150 °C junction temperature, Vz shifts +0.83 V from 25 °C value (27 V × +5.5 mV/K × 125 K), resulting in ~27.83 V output. Derating to 150 mW above 70 °C ambient is required to limit ΔTj and maintain specification compliance.