Diodes Incorporated DDZ20DSF-7

Overview

DDZ20DSF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode in SOD323F package, delivering tightly regulated 19.72–20.72V zener voltage at 10mA test current, with 50Ω maximum zener impedance and ±0.07µA reverse leakage at 18.7V, used for voltage reference and overvoltage protection in power supply feedback loops.

For engineers reviewing the DDZ20DSF-7 datasheet, DDZ20DSF-7 pinout, DDZ20DSF-7 application, or DDZ20DSF-7 equivalent, this part supports high-accuracy analog sensing, low-power voltage regulation, and automotive-grade ECU reference circuits where thermal stability and tight V_Z tolerance are critical.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 20.22V (typical), specified at I_ZT = 10mA, and exhibits a temperature coefficient of approximately +3.5 mV/°C (inferred from Fig. 3 at ~20V). Its low 50Ω dynamic impedance ensures stable regulation under varying load conditions.

Designed for FR-4 PCB mounting with 10mm × 10mm copper pad, it achieves 500mW power dissipation and 250°C/W junction-to-ambient thermal resistance. The SOD323F package features matte tin–annealed copper alloy leads, J-STD-020 Level 1 moisture sensitivity, and RoHS-compliant "Green" molding compound.

Key Specifications

Pinout & Package

Package: SOD323F - ultra-compact surface-mount plastic package (2.50 mm × 1.25 mm × 0.95 mm), cathode identified by band marking, leadframe composed of copper alloy with matte tin annealed finish, UL 94V-0 rated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C20LT1G and MMSZ5248B-TP, DDZ20DSF-7 delivers tighter voltage tolerance (±2.5% vs. ±5%), identical power rating to MMSZ5248B-TP but in a 30% smaller footprint, making it optimal for space-constrained, high-accuracy voltage reference designs.

Availability

DDZ20DSF-7 is available at Aetrix Electronics and suitable for AC-DC power supplies, automotive ECU modules, industrial PLC analog inputs, and medical battery monitoring systems requiring stable component supply with guaranteed long-term availability.

Supply support for DDZ20DSF-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.

This device belongs to the DDZxx(x)SF precision Zener series, engineered specifically for high-stability voltage reference and regulation in automotive, industrial, and medical power systems demanding tight V_Z tolerance and low thermal drift.

FAQ

What is the maximum continuous power dissipation for DDZ20DSF-7 on a standard FR-4 PCB?

The DDZ20DSF-7 is rated for 500 mW maximum power dissipation when mounted on an FR-4 PCB with a 10 mm × 10 mm copper pad and board dimensions of 35 mm × 25 mm. This value assumes ambient temperature of +25°C and derates linearly above that per the published power derating curve (Fig. 1), reaching zero dissipation at +150°C ambient.

How does the zener voltage tolerance affect its use in feedback circuits?

With a guaranteed V_Z range of 19.72–20.72 V at 10 mA, the ±2.5% tolerance ensures predictable regulation without post-manufacturing trimming. In a typical flyback feedback network, this translates to <±0.8% output voltage error before compensation, enabling single-batch calibration for production lines targeting ±1% overall output accuracy.

Is DDZ20DSF-7 qualified for automotive applications per AEC-Q101?

While the DDZ20DSF-7 is manufactured in IATF 16949-certified facilities and supports PPAP documentation, it is not explicitly listed as AEC-Q101 qualified in Diodes' official product definitions. For automotive applications requiring formal qualification, engineers should contact Diodes' local representative to confirm change-controlled release status and obtain applicable PPAP documentation packages.

What is the significance of the "2J" marking code on the device body?

The "2J" top-marking code uniquely identifies the DDZ20DSF-7 variant within the DDZ2V4ASF–DDZ39DSF family. Per the Electrical Characteristics table (page 3), "2J" corresponds exclusively to the 20V Zener grade with D-grade tolerance (±2.5%) and 10 mA test current, distinguishing it from A/B/C variants (e.g., "RJ"/"ZJ"/"PJ") which share the same V_Z range but differ in tolerance and test conditions.