Diodes Incorporated BZX84C22-7

Overview

BZX84C22-7 from Diodes Incorporated is a 22 V, 350 mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and reference applications at 5 mA test current, with ±5% tolerance (20.8–23.3 V), 55 Ω dynamic impedance at 5 mA, and −16.4 mV/°C temperature coefficient. It serves as a stable shunt voltage reference in power supply feedback loops and overvoltage protection circuits.

For engineers reviewing the BZX84C22-7 datasheet, BZX84C22-7 pinout, BZX84C22-7 application, or BZX84C22-7 equivalent, key selection criteria include nominal Zener voltage accuracy, thermal coefficient stability across −65°C to +150°C, low reverse leakage (<0.1 µA at 15.4 V), SOT23 footprint compatibility, 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 (IZT), exhibiting a temperature coefficient of −16.4 mV/°C - indicating predictable, linear voltage drift with temperature rise. Its planar die construction ensures consistent parametric performance and high reliability under thermal cycling.

The device delivers 350 mW power dissipation when leads are held at ambient temperature, with thermal resistance junction-to-ambient of 357 °C/W under specified mounting conditions. It maintains stable regulation down to 1 mA and supports fast transient response due to low total capacitance (~10 pF at VR = 1 V).

Key Specifications

Pinout & Package

Package: SOT23 - molded plastic case, UL 94V-0 rated, matte tin-plated alloy 42 leadframe, polarity indicated by cathode band on top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5247BS-7-F and BZX84-C22LT1G, BZX84C22-7 offers balanced power handling and impedance for general-purpose regulation, while the former favors low-noise design and the latter enables seamless second-source procurement without layout change.

Availability

BZX84C22-7 is available at Aetrix Electronics and suitable for automotive power management, industrial sensor conditioning, and consumer DC-DC converter designs requiring stable component supply with AEC-Q101 assurance and RoHS 3 compliance.

Supply support for BZX84C22-7 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 cost-effective, high-reliability voltage reference and protection in automotive, industrial, and consumer power systems.

FAQ

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

The BZX84C22-7 has a nominal Zener voltage of 22 V at 5 mA test current, with a guaranteed breakdown range of 20.8 V to 23.3 V. It is not rated for reverse blocking below this range - operation below 20.8 V results in negligible reverse current (<0.1 µA at 15.4 V), and sustained voltage above 23.3 V at excessive current risks thermal runaway.

Is BZX84C22-7 suitable for use in automotive applications?

Yes - BZX84C22-7 is explicitly qualified to AEC-Q101 standards, with operating temperature range of −65°C to +150°C, green halogen-free construction, and reliability validation for automotive powertrain, body electronics, and infotainment systems. The "-7" suffix denotes standard-grade tape-and-reel packaging compatible with SMT lines.

How does the temperature coefficient affect circuit performance?

With a temperature coefficient of −16.4 mV/°C, the Zener voltage decreases by approximately 16.4 mV per degree Celsius rise. In a 22 V reference, this yields ~−0.075%/°C drift. Designers use this known slope for active compensation or select it where predictable, linear drift is preferable to zero-TC parts with higher impedance.

Can this part replace older BZX84C22 variants with different suffixes?

Yes - BZX84C22-7 is functionally identical to BZX84C22-13-F and BZX84C22-Q-7-F except for packaging quantity (3,000 vs. 10,000/reel) and automotive qualification (Q-suffix). All share identical electrical specs, SOT23 package, and green material composition per DS18001 Rev. 33.