Diodes Incorporated BZX84C27-7-F

Overview

BZX84C27-7-F from Diodes Incorporated is a 27V, 350mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and overvoltage protection in low-power analog and digital circuits. It delivers nominal Zener voltage of 27V at 2.0mA test current, with ±10% tolerance (25.1–28.9V), 80Ω dynamic impedance at 2mA, and 0.1µA maximum reverse leakage at 21.4V.

For engineers reviewing the BZX84C27-7-F datasheet, BZX84C27-7-F pinout, BZX84C27-7-F application, or BZX84C27-7-F equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (357°C/W), low leakage at rated VR, SOT23 footprint compatibility, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent V_Z distribution and long-term stability, while the SOT23 package enables high-density PCB layouts and compatibility with automated pick-and-place assembly.

The device exhibits a negative temperature coefficient of −3.5mV/°C near 27V, enabling predictable drift behavior in temperature-sensitive references. With 0.5mA knee current and 18.9V minimum regulating voltage, it supports reliable turn-on in low-current bias networks without excessive power dissipation.

Key Specifications

Pinout & Package

Package: SOT23 - 3-terminal surface-mount plastic package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated, moisture sensitivity level 1, weight ≈ 0.008g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5256BS-7-F and BZX84-C27LT1G, BZX84C27-7-F uniquely balances low-leakage performance (0.1µA), automotive qualification, and SOT23 compatibility-making it optimal for space-constrained, safety-critical voltage references where both reliability and precision matter.

Availability

BZX84C27-7-F is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog signal clamping, and low-power IoT reference designs requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BZX84C27-7-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, manufacturing, and sales operations across Asia, Europe, and North America.

The BZX84 series belongs to Diodes' precision Zener diode product line, engineered specifically for stable voltage reference and overvoltage protection in automotive, industrial, and consumer power management systems.

FAQ

What is the maximum reverse voltage (V_R) before significant leakage occurs?

The BZX84C27-7-F specifies 0.1µA maximum reverse current at V_R = 21.4V. At 24V, leakage rises to approximately 0.5µA per typical curves in DS18001 Rev.33, remaining well below 1µA until approaching 27V. This makes it suitable for pre-breakdown monitoring circuits where sub-microamp leakage is critical.

Can this Zener diode be used in parallel for higher power handling?

No-parallel connection is not recommended due to mismatched Zener voltage tolerances (±10%) and thermal runaway risk. Even small V_Z differences cause current hogging; measured unit-to-unit spread exceeds 300mV at 2mA. For >350mW needs, use a single higher-power Zener or active regulation instead.

Is the SOT23 pinout compatible with JEDEC TO-236AB standard?

Yes-the BZX84C27-7-F uses standard SOT23 (JEDEC TO-236AB) pinout: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = NC (die attach). This matches industry-standard footprints used by Diodes, ON Semiconductor, and Vishay, enabling direct PCB layout reuse across vendors.

Does the "-7-F" suffix indicate tape-and-reel packaging and RoHS compliance?

Yes-the "-7-F" suffix denotes 3,000-piece tape-and-reel packaging (7-inch reel) and full RoHS 3 compliance, including halogen- and antimony-free green molding compound. The "F" explicitly confirms lead-free plating and exemption-free compliance per EU Directive 2015/863/EU.