Diodes Incorporated PD3Z284C22-7

Overview

PD3Z284C22-7 from Diodes Incorporated is a 22 V, 5 mA nominal Zener diode in PowerDI™323 package, rated for 500 mW power dissipation and qualified to AEC-Q101 for automotive reliability. It exhibits 250 °C/W thermal resistance, ±5% Zener voltage tolerance (20.8–23.3 V), and low 25 Ω dynamic impedance at 5 mA test current, used for precision voltage regulation and overvoltage protection in compact DC power rails.

For engineers reviewing the PD3Z284C22-7 datasheet, PD3Z284C22-7 pinout, PD3Z284C22-7 application, or PD3Z284C22-7 equivalent, key selection criteria include Zener voltage accuracy at 5 mA, junction-to-ambient thermal resistance under PCB-mounted conditions, reverse leakage current ≤0.1 µA at 15.4 V, and compatibility with lead-free reflow profiles per J-STD-020D Level 1 moisture sensitivity.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage across load variations. Its planar die construction ensures consistent voltage regulation and low temperature coefficient (±0.4 mV/°C typical) over –65 °C to +150 °C operating range.

The device uses a cathode-banded polarity marking and matte tin–annealed copper leadframe for solderability per MIL-STD-202 Method 208. Its ultra-small PowerDI323 footprint (2.5 × 1.9 × 0.13 mm) supports high-density PCB layouts while meeting UL 94V-0 flammability requirements.

Key Specifications

Pinout & Package

Package: PowerDI™323 - ultra-small surface-mount plastic case (2.50 × 1.90 × 0.13 mm), molded with halogen-free "Green" compound, UL 94V-0 rated, cathode band polarity marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with D3Z22BF-7 and BZX384-C22,115, PD3Z284C22-7 offers superior automotive qualification and tighter Zener impedance (25 Ω vs. ≥45 Ω), but requires careful thermal layout due to its 250 °C/W R_θJA; D3Z22BF-7 provides better thermal headroom, while BZX384-C22 sacrifices reliability for lower cost.

Availability

PD3Z284C22-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, medical diagnostic equipment, and telecom power supervisors requiring stable component supply and long-term lifecycle support.

Supply support for PD3Z284C22-7 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, specializing in high-reliability components for automotive, industrial, and consumer markets.

PD3Z284C22-7 belongs to the PD3ZxxC series of AEC-Q101-qualified Zener diodes designed specifically for space-constrained, high-stability voltage reference and protection functions in harsh-environment electronics.

FAQ

Is PD3Z284C22-7 suitable for automotive applications?

Yes - it is fully qualified to AEC-Q101 standards, including stress tests for temperature cycling, high-temperature reverse bias, and electrostatic discharge. Its operating range (–65 °C to +150 °C), lead-free construction, and UL 94V-0 package make it appropriate for under-hood and chassis-mounted automotive systems such as lighting controllers and power distribution units.

What is the recommended PCB pad layout for PD3Z284C22-7?

The manufacturer specifies a recommended pad layout in Application Note AP02001, optimized for thermal performance and solder joint reliability. It defines copper area, trace width, and thermal relief patterns to achieve the rated 250 °C/W R_θJA. Deviations may reduce power handling capability and increase junction temperature beyond safe limits.

How does the 25 Ω Zener impedance affect regulation accuracy?

A 25 Ω dynamic impedance at 5 mA means the output voltage varies by ~25 mV per 1 mA change in Zener current. This directly impacts regulation precision in variable-load applications - for example, a 2 mA load shift causes ~50 mV drift in the regulated rail, which must be accounted for in reference-sensitive circuits like ADC bias networks.

Why is PD3Z284C22-7 marked as "Not Recommended for New Designs"?

Diodes Incorporated recommends migrating to the newer D3ZxxBF series due to improved thermal performance (lower R_θJA), enhanced surge robustness, and extended manufacturing support. PD3Z284C22-7 remains available for legacy design refreshes and existing production, but new projects should evaluate D3Z22BF-7 for better long-term supply assurance and performance.