Diodes Incorporated DDZ2V7ASF-7

Overview

DDZ2V7ASF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage 2.64 V (min 2.54 V, max 2.75 V) at 20 mA test current, 110 Ω dynamic impedance, and 1 µA reverse leakage at 1 V. It delivers tight voltage regulation for low-voltage reference and biasing in power management circuits on FR-4 PCBs.

For engineers reviewing the DDZ2V7ASF-7 datasheet, DDZ2V7ASF-7 pinout, DDZ2V7ASF-7 application, or DDZ2V7ASF-7 equivalent, this part supports stable low-voltage referencing in automotive body electronics, industrial sensor signal conditioning, and portable battery-powered systems where ±3.9% V_Z tolerance and SOD323F thermal performance are critical.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable reference voltage under varying load and temperature conditions. Its 250 °C/W junction-to-ambient thermal resistance is specified for a 10 mm × 10 mm copper pad on FR-4, enabling predictable derating up to +150 °C ambient.

The device exhibits a negative temperature coefficient near 2.7 V (≈ −2 mV/°C per Fig. 3), requiring compensation in high-precision references. Reverse leakage remains ≤1 µA at VR = 1 V, supporting low-power standby modes in always-on subsystems.

Key Specifications

Pinout & Package

SOD323F is a 2-terminal surface-mount plastic package with molded "green" compound (UL 94V-0), matte tin-plated copper alloy leadframe, and cathode band marking. Dimensions: 1.25 mm × 1.70 mm × 0.90 mm (L × W × H), weight ≈ 0.004 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C2V7LT1G and MMSZ4678T1G, DDZ2V7ASF-7 offers superior V_Z tolerance (±3.9% vs. ±7.4%/±8.3%) and SOD323F's smaller footprint and moisture-insensitive Level 1 handling-critical for high-yield automotive SMT lines.

Availability

DDZ2V7ASF-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, portable medical devices, and smart home battery management systems requiring stable component supply and AEC-Q200-aligned manufacturing.

Supply support for DDZ2V7ASF-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 with ISO/TS 16949 and IATF 16949 certified facilities.

This part belongs to the DDZxx(x)xSF precision Zener series designed specifically for low-voltage reference and biasing in space-constrained, thermally demanding applications where tight tolerance and robust SMT manufacturability are essential.

FAQ

What is the maximum continuous Zener current for DDZ2V7ASF-7 at +85°C ambient?

At +85°C ambient, the power derating curve (Fig. 1) reduces maximum dissipation to 375 mW. With V_Z ≈ 2.64 V, the maximum continuous Zener current is 375 mW ÷ 2.64 V ≈ 142 mA. This assumes proper PCB copper area per Note 5 (10 mm × 10 mm pad on 35 mm × 25 mm FR-4 board).

Does DDZ2V7ASF-7 meet AEC-Q200 requirements for passive components?

Yes-Diodes Incorporated states that parts qualified to AEC-Q200 are available upon request, with PPAP capability and manufacture in IATF 16949 certified facilities. The SOD323F package, lead-free construction, and −65 to +150 °C operating range align with AEC-Q200 Grade 1 requirements for passive discrete devices.

How does the 110 Ω Zener impedance affect noise performance in a reference circuit?

A 110 Ω dynamic impedance contributes directly to thermal noise (≈ 1.3 nV/√Hz at 25°C) and modulates supply ripple at the cathode node. For low-noise applications, it is typically bypassed with a 100 nF ceramic capacitor to reduce effective impedance below 100 Hz, improving PSRR by >40 dB in the audio band.

Can DDZ2V7ASF-7 be used in place of a 2.7 V Zener with looser tolerance in an existing design?

Yes-its 2.54–2.75 V range fully covers nominal 2.7 V operation and improves accuracy over wider-tolerance alternatives. No layout change is needed since SOD323F matches common 2-pin SMD footprints; verify thermal margin if original design operated near 500 mW limits at elevated ambient temperatures.