Diodes Incorporated BZX84C22-7-F

Overview

BZX84C22-7-F from Diodes Incorporated is a 22 V, 350 mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and overvoltage protection in low-power analog and digital circuits. It delivers ±5% zener voltage tolerance at 5 mA test current, exhibits 55 Ω dynamic impedance at 5 mA, and maintains stable operation from –65 °C to +150 °C - used in power supply feedback loops, reference voltage generation, and ESD clamp networks.

For engineers reviewing the BZX84C22-7-F datasheet, BZX84C22-7-F pinout, BZX84C22-7-F application, or BZX84C22-7-F equivalent, key selection criteria include nominal zener voltage (22 V), power dissipation (350 mW), zener impedance (55 Ω @ 5 mA), reverse leakage (<0.1 µA @ 15.4 V), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 22 V at 5 mA test current, featuring a temperature coefficient of +16.4 mV/°C - indicating positive drift with rising junction temperature. Its planar die construction ensures consistent parametric performance across production lots.

The device is rated for 350 mW power dissipation under ambient conditions with terminals held at TA, and derates linearly above 25 °C per the published curve (RθJA = 357 °C/W). It supports automated SMT assembly and meets J-STD-020 Level 1 moisture sensitivity requirements.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount, 3-terminal plastic package with matte tin-plated alloy 42 leadframe; UL 94V-0 rated; 0.008 g typical weight; polarity indicated by cathode band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5247BS-7-F and BZX84-C22,115, the BZX84C22-7-F uniquely combines AEC-Q101 qualification, full RoHS 3 compliance, and 350 mW power handling - making it the preferred choice for new automotive and industrial designs requiring long-term supply assurance and regulatory alignment.

Availability

BZX84C22-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and telecom power management systems requiring stable component supply and long-lifecycle support.

Supply support for BZX84C22-7-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 for stable voltage reference and protection in cost-sensitive, high-volume applications including automotive, computing, and industrial controls.

FAQ

What is the maximum reverse voltage this Zener can withstand before breakdown?

The BZX84C22-7-F has a nominal zener voltage of 22 V with a guaranteed range of 20.8 V to 23.3 V at 5 mA test current. Its reverse breakdown is specified to occur within this band; operation below 20.8 V ensures negligible conduction (<0.1 µA leakage), while voltages above 23.3 V initiate controlled avalanche conduction.

Is this part suitable for use in automotive applications?

Yes - the BZX84C22-7-F is explicitly qualified to AEC-Q101 standards, including stress tests for temperature cycling, humidity, and mechanical shock. Its operating temperature range (–65 °C to +150 °C) and green, lead-free construction meet automotive electronics requirements for engine control units and body modules.

How does the temperature coefficient affect regulation accuracy?

This device has a temperature coefficient of +16.4 mV/°C, meaning its zener voltage increases by approximately 16.4 mV per degree Celsius rise in junction temperature. For a 50 °C rise above 25 °C, the voltage shifts ~0.82 V - requiring thermal design consideration in precision references or high-ambient environments.

Can this Zener replace a 24 V part in an existing design?

No - the BZX84C22-7-F is specifically rated for 22 V nominal breakdown. Substituting it for a 24 V Zener (e.g., BZX84C24-7-F) would result in premature conduction and potential over-regulation or instability. Always match nominal zener voltage, power rating, and impedance specifications to maintain circuit functionality.