Diodes Incorporated DDZ22ASF-7

Overview

DDZ22ASF-7 from Diodes Incorporated is a precision 22 V Zener diode in SOD323F package, rated for 500 mW power dissipation on FR-4 PCB, with ±2.3% zener voltage tolerance (20.15–21.20 V @ 5 mA), 55 Ω dynamic impedance at 1 kHz, and 0.07 µA reverse leakage at 19.1 V. It serves as a stable voltage reference in low-power analog monitoring circuits.

For engineers reviewing the DDZ22ASF-7 datasheet, DDZ22ASF-7 pinout, DDZ22ASF-7 application, or DDZ22ASF-7 equivalent, this device is selected for high-accuracy voltage regulation in space-constrained, thermally stable PCB layouts where tight V_Z tolerance and low thermal resistance (250 °C/W) are critical.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 22 V at test current I_ZT = 5 mA. Its temperature coefficient is +11.5 mV/°C (typical for 22 V devices per Fig. 3), enabling predictable drift compensation in reference designs.

The device uses a planar epitaxial construction with cathode band marking, optimized for automated surface-mount assembly. Its SOD323F package delivers low thermal resistance (250 °C/W) when mounted on 10 mm × 10 mm copper pads per JESD51-2 standards.

Key Specifications

Pinout & Package

Package: SOD323F - ultra-small surface-mount plastic package (2.50 mm × 1.70 mm × 1.25 mm), molded with halogen-free green compound, UL 94V-0 rated, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C22LT1G and MMSZ4686T1G, DDZ22ASF-7 delivers superior voltage accuracy (±2.3% vs. ±5%), identical power handling, and smaller SOD323F footprint-making it optimal for high-density, high-precision reference designs where calibration time and board area are constrained.

Availability

DDZ22ASF-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery reference, automotive cabin control panels, and medical infusion pump voltage monitoring requiring stable component supply across long production lifecycles.

Supply support for DDZ22ASF-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 industrial, automotive, and computing markets since 1964.

The DDZ series targets precision voltage reference applications demanding tight zener tolerance, low dynamic impedance, and robust environmental compliance-designed specifically for automated SMT assembly in mission-critical systems.

FAQ

What is the maximum continuous reverse current the DDZ22ASF-7 can sustain without degradation?

The DDZ22ASF-7 is rated for 500 mW power dissipation on FR-4 PCB with specified pad layout. At its nominal 22 V zener voltage, this corresponds to a maximum continuous reverse current of approximately 22.7 mA (500 mW ÷ 22 V). Exceeding this requires derating per the power derating curve in Figure 1, especially above +25 °C ambient.

Does the DDZ22ASF-7 have AEC-Q101 qualification for automotive use?

The DDZ22ASF-7 itself is not pre-qualified to AEC-Q101, but Diodes Incorporated offers automotive-grade variants (e.g., DDZ22ASF-13) manufactured in IATF 16949-certified facilities and capable of PPAP submission. Customers requiring automotive qualification should contact Diodes' local representative to initiate change control and qualification testing.

How does the SOD323F package affect thermal performance compared to SOD-123?

The SOD323F package achieves 250 °C/W junction-to-ambient thermal resistance on FR-4 with 10 mm × 10 mm copper pads-comparable to SOD-123 under identical layout conditions. Its smaller footprint (2.50 mm × 1.70 mm vs. 3.7 mm × 1.6 mm) concentrates heat but maintains equivalent R_θJA due to optimized leadframe design and green molding compound thermal conductivity.

Can DDZ22ASF-7 be used in series to achieve higher reference voltages?

Yes-two DDZ22ASF-7 diodes in series yield ~44 V reference with cumulative tolerance (±4.6%) and doubled dynamic impedance (~110 Ω). However, thermal coupling between devices must be minimized to avoid mismatched temperature coefficients; individual thermal vias and separation >2 mm are recommended for stable operation.