Diodes Incorporated DDZ22CSF-7

Overview

DDZ22CSF-7 from Diodes Incorporated is a precision 21.08–22.17 V Zener diode in SOD323F package, rated for 500 mW power dissipation on FR-4 PCB, with 5 Ω typical zener impedance at 5 mA test current and ±0.07 µA reverse leakage at 20 V. It serves as a stable voltage reference in low-power analog monitoring circuits and power supply feedback paths.

For engineers reviewing the DDZ22CSF-7 datasheet, DDZ22CSF-7 pinout, DDZ22CSF-7 application, or DDZ22CSF-7 equivalent, key selection criteria include tight zener voltage tolerance (±2.5% at 22 V), low thermal resistance (250 °C/W), automotive-grade process capability, and compatibility with automated SMT assembly on standard FR-4 boards.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining a stable breakdown voltage across its cathode-anode terminals under reverse bias. Its temperature coefficient is +11.5 mV/°C (typical for 22 V Zeners per Fig. 3), and it exhibits minimal self-heating during pulsed testing due to short-duration (<40 ms) measurement methodology.

The SOD323F package enables high-density placement while delivering robust thermal performance: junction-to-ambient thermal resistance is 250 °C/W when mounted on a 10 mm × 10 mm pad on a 35 mm × 25 mm FR-4 board. Reverse leakage remains ≤0.07 µA up to 20 V, supporting low-current biasing in precision sensing nodes.

Key Specifications

Pinout & Package

Package: SOD323F - surface-mount plastic package with cathode band marking; dimensions: 1.25 mm × 1.70 mm × 0.75 mm (L × W × H); weight ≈ 0.004 g; moisture sensitivity level 1 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C22LT1G and MMSZ5247B-TP, DDZ22CSF-7 delivers tighter voltage tolerance, lower zener impedance, and superior thermal performance in a smaller footprint-making it optimal for space-constrained, high-accuracy reference designs.

Availability

DDZ22CSF-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control modules, and medical infusion pump feedback requiring stable component supply with guaranteed long-term continuity.

Supply support for DDZ22CSF-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 computing markets.

This device belongs to the DDZxxCSF precision Zener series, engineered for applications demanding tight voltage tolerance, low leakage, and AEC-Q200-aligned manufacturing processes in compact SMD packages.

FAQ

What is the maximum continuous reverse current this Zener can handle at 22 V?

The DDZ22CSF-7 is not rated for continuous reverse current at its nominal Zener voltage. Its specified test condition is I_ZT = 5 mA for parameter characterization. Continuous operation must stay within the 500 mW power limit: at 22 V, that corresponds to ≤22.7 mA average current. Derating per Fig. 1 is required above 75 °C ambient.

Does this part have AEC-Q200 qualification?

DDZ22CSF-7 is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not individually AEC-Q200 tested, Diodes states that parts in this family meet AEC-Q200 requirements for passive components when used per datasheet limits and with appropriate change control-confirm with Diodes' automotive team for project-specific qualification status.

Can this Zener be used in forward-bias mode as a regular diode?

Yes-the device exhibits 0.9 V forward voltage at 10 mA, matching standard silicon diode behavior. It is routinely used bidirectionally: reverse for regulation, forward for ESD clamping or polarity protection. However, forward surge ratings are not characterized; use only within absolute maximum ratings (e.g., I_F ≤ 200 mA peak).

How does the SOD323F package compare thermally to SOD-123?

SOD323F has identical thermal resistance (250 °C/W) to SOD-123 when mounted per Diodes' recommended 10 mm × 10 mm pad layout. However, its smaller footprint (1.25 × 1.70 mm vs. 1.8 × 2.8 mm) yields higher power density and requires stricter solder paste volume control to avoid voiding and thermal delamination.