Diodes Incorporated DDZ7V5ASF-7

Overview

DDZ7V5ASF-7 from Diodes Incorporated is a precision 7.5 V Zener diode in SOD323F package, designed for voltage regulation and reference applications with ±3.2% tolerance (6.85–7.22 V), 30 Ω dynamic impedance at 20 mA, and 7.5 µA reverse leakage at 4 V. It delivers stable reference performance in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.

For engineers reviewing the DDZ7V5ASF-7 datasheet, DDZ7V5ASF-7 pinout, DDZ7V5ASF-7 application, or DDZ7V5ASF-7 equivalent, this device is selected for tight-voltage-reference stability, low-impedance regulation under 20 mA test current, automotive-grade thermal robustness (−65°C to +150°C), and compatibility with automated SMT assembly on FR-4 PCBs.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 7.5 V measured at I_ZT = 20 mA within 40 ms to minimize self-heating effects. Its temperature coefficient is approximately +4.5 mV/°C near 7.5 V, enabling predictable drift compensation in reference designs.

The device uses a planar epitaxial silicon junction structure optimized for low noise and repeatable breakdown characteristics. Its 500 mW power dissipation rating is validated on FR-4 PCB with 10 mm × 10 mm copper pad, and thermal resistance is 250°C/W junction-to-ambient.

Key Specifications

Pinout & Package

Package: SOD323F - ultra-small plastic molded case with cathode band marking; dimensions: 1.25 mm (D) × 1.70 mm (E) × 0.75 mm (He); 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 precision Zener reference applications.

Compared with BZX84-C7V5 and MMSZ5236B, DDZ7V5ASF-7 offers superior voltage accuracy (±3.2% vs. ±5%), identical low impedance, and best-in-class thermal performance (250°C/W) in the smallest footprint-making it optimal for space-constrained, high-accuracy reference designs.

Availability

DDZ7V5ASF-7 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, ADC reference buffering, and temperature-compensated biasing requiring stable component supply across automotive, industrial, and medical electronics programs.

Supply support for DDZ7V5ASF-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 DDZxxASF/BSF/CSF series of precision Zener diodes engineered for voltage reference stability, low-temperature drift, and AEC-Q200 readiness in safety-critical subsystems.

FAQ

What is the maximum continuous reverse current this Zener can handle without degradation?

The DDZ7V5ASF-7 is rated for 20 mA test current (I_ZT) and supports continuous reverse current up to 65 mA at 25°C ambient, based on its 500 mW power limit and 7.5 V nominal voltage. Derating is required above 25°C per the published power derating curve (0.6 W at 25°C, linearly decreasing to zero at 150°C).

Does this part meet AEC-Q200 stress testing requirements for passive components?

While not explicitly qualified to AEC-Q200 in the datasheet, DDZ7V5ASF-7 is manufactured in IATF 16949-certified facilities and supports PPAP documentation. Diodes states that automotive-grade variants (e.g., DDZ7V5ASF-7Q) are available upon request with full AEC-Q200 qualification-including temperature cycling, humidity bias, and mechanical shock testing.

Can this Zener be used in series to achieve higher reference voltages?

Yes-multiple DDZ7V5ASF-7 devices may be connected in series to generate higher reference voltages (e.g., two in series yield ~15 V). However, ensure matched unit selection to avoid current imbalance, and verify total power dissipation does not exceed 500 mW per device under worst-case current conditions.

Is the SOD323F package compatible with standard 0805 reflow profiles?

Yes-the SOD323F package (1.25 × 1.70 mm) falls within IPC-7351B "0805" land pattern guidelines. Its matte tin annealed terminals are fully compatible with Pb-free SAC305 reflow profiles (peak 245°C, 60–90 sec above 217°C), and moisture sensitivity level 1 eliminates bake requirements prior to assembly.