Diodes Incorporated BZX84B27-7-F

Overview

BZX84B27-7-F from Diodes Incorporated is a precision 27 V ±2% tolerance Zener diode in SOT23 package, rated for 350 mW power dissipation at ambient temperature, with 80 Ω maximum Zener impedance at 2 mA test current and 0.1 µA maximum reverse leakage at 18.9 V, widely used for voltage regulation and reference in power supply feedback loops.

For engineers reviewing the BZX84B27-7-F datasheet, BZX84B27-7-F pinout, BZX84B27-7-F application, or BZX84B27-7-F equivalent, key selection criteria include Zener voltage tolerance (±2%), low dynamic impedance (80 Ω @ 2 mA), AEC-Q101 qualification for automotive use, thermal resistance (357 °C/W), and SOT23 surface-mount compatibility with automated assembly.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable 27 V across its terminals within ±2% tolerance under nominal 2 mA Zener test current. Its 80 Ω Zener impedance at 2 mA and 300 Ω at knee current (0.5 mA) ensures predictable regulation under varying load conditions.

Designed for high-reliability applications, it meets AEC-Q101 stress-test requirements and features halogen- and antimony-free "Green" construction with matte tin lead finish, UL 94V-0 molded plastic case, and moisture sensitivity level 1 per J-STD-020.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount, 3-terminal plastic package with 0.915 mm body width, 2.40 mm length, and 0.40 mm thickness; compatible with reflow soldering and automated pick-and-place.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ4683T1G and BZX84-C27, BZX84B27-7-F delivers tighter ±2% regulation and AEC-Q101 reliability in identical SOT23 form factor-critical for automotive feedback loops and industrial analog signal chains where long-term drift and qualification matter.

Availability

BZX84B27-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC analog input protection, medical infusion pump power supplies, and consumer smart meter reference dividers requiring stable component supply with full traceability and lifecycle management.

Supply support for BZX84B27-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and North America.

This part belongs to the BZX84B series of precision Zener diodes, engineered specifically for high-stability voltage reference and overvoltage clamping in automotive, industrial, and medical power systems where tight tolerance and AEC-Q101 compliance are mandatory.

FAQ

What is the maximum reverse leakage current for BZX84B27-7-F at 18.9 V?

The maximum reverse leakage current is 0.1 µA at 18.9 V, measured at 25°C ambient temperature. This value is specified in the Electrical Characteristics table under "Maximum Reverse Current (I_R)" for Type Number BZX84B27. It reflects the diode's ability to hold off voltage with negligible standby current in high-impedance reference paths.

Is BZX84B27-7-F suitable for automotive applications?

Yes-BZX84B27-7-F is explicitly qualified to AEC-Q101 standards for high-reliability automotive use. Its qualification includes temperature cycling, humidity testing, and mechanical shock validation. The "Q" suffix in alternate part numbers (e.g., BZX84B27Q-7-F) denotes automotive-grade packaging, but the -7-F variant itself carries full AEC-Q101 certification per Diodes Incorporated documentation.

How does the Zener impedance vary with current for this device?

Zener impedance is 80 Ω maximum at 2 mA test current (Z_ZT) and rises to 300 Ω maximum at 0.5 mA knee current (Z_ZK). This increase reflects higher dynamic resistance near breakdown threshold, meaning regulation performance degrades at very low currents-designs should maintain ≥1 mA operating current for stable 27 V reference behavior.

What is the thermal resistance junction-to-ambient for BZX84B27-7-F on standard FR-4?

The thermal resistance junction-to-ambient (R_θJA) is 357 °C/W when mounted on FR-4 PCB with Diodes Incorporated's recommended pad layout (documented in DS36159). This value assumes terminals held at ambient temperature and is valid for steady-state operation-not derated for pulsed conditions or non-standard copper area.