Diodes Incorporated DDZ4V7ASF-7

Overview

DDZ4V7ASF-7 from Diodes Incorporated is a precision 0.5W surface-mount Zener diode with nominal zener voltage 4.55 V (min 4.44 V, max 4.68 V) at 20 mA test current, 130 Ω dynamic impedance, and 10 µA reverse leakage at 1 V. It delivers tight voltage tolerance (±2.2% typical), operates from –65°C to +150°C, and is packaged in SOD323F for space-constrained power regulation and reference applications.

For engineers reviewing the DDZ4V7ASF-7 datasheet, DDZ4V7ASF-7 pinout, DDZ4V7ASF-7 application, or DDZ4V7ASF-7 equivalent, this part supports low-power voltage clamping, analog signal conditioning, and precision biasing where stable 4.7 V reference and low thermal drift are required - especially in automotive-grade and industrial sensor front-ends.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled V_Z across temperature (TC ≈ +2.5 mV/°C near 4.7 V). Its 250 °C/W junction-to-ambient thermal resistance assumes mounting on FR-4 with 10 mm × 10 mm copper pad, enabling predictable derating above 25°C ambient.

The device features matte tin–annealed copper alloy terminals, halogen- and antimony-free "Green" molding compound (UL 94V-0), and moisture sensitivity level 1 per J-STD-020 - confirming suitability for high-reliability automated SMT assembly without pre-bake.

Key Specifications

Pinout & Package

Package: SOD323F - ultra-small plastic surface-mount package with molded cathode band marking, 0.004 g mass, and UL 94V-0 flammability rating. Dimensions: D = 1.25 mm (length), E = 1.70 mm (width), He = 2.50 mm (height).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C4V7LT1G and MMSZ4704T1G, DDZ4V7ASF-7 offers superior voltage precision (±2.2% vs ±5%), identical 500 mW rating, and the smallest available footprint - making it optimal for next-generation miniaturized, high-accuracy reference designs.

Availability

DDZ4V7ASF-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive cabin control reference, low-power IoT node voltage clamping, and medical wearable battery monitoring requiring stable component supply across extended temperature ranges and high-volume production.

Supply support for DDZ4V7ASF-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.

DDZ4V7ASF-7 belongs to Diodes' precision Zener diode family designed specifically for stable voltage reference and clamping in space-constrained, thermally demanding applications - emphasizing tight V_Z tolerance, low leakage, and automotive-grade process control.

FAQ

What is the maximum continuous Zener current for DDZ4V7ASF-7 at 25°C ambient?

The device supports up to 106 mA continuous Zener current at 25°C ambient, calculated from P_D = 500 mW and V_Z ≈ 4.7 V (I_Z(max) = P_D/V_Z). Derating begins linearly above 25°C per the 250 °C/W thermal resistance curve, reaching zero at 150°C junction temperature.

Does DDZ4V7ASF-7 meet AEC-Q101 qualification for automotive use?

No - DDZ4V7ASF-7 is not AEC-Q101 qualified. While manufactured in IATF 16949 certified facilities and meeting RoHS/halogen-free requirements, Diodes specifies that AEC-Q101 qualification requires explicit PPAP submission and change control; users must contact Diodes directly for automotive-grade variants like the AZ series.

How does the SOD323F package affect solder joint reliability in thermal cycling?

The SOD323F's copper alloy leadframe with matte tin annealing provides excellent intermetallic formation and thermal fatigue resistance. Its low mass (0.004 g) and symmetric geometry minimize CTE-induced stress during –40°C to +125°C cycling, supporting >1,000 cycles without solder joint cracking per IPC-9701.

Can DDZ4V7ASF-7 be used as a substitute for a 4.7 V TL431-based shunt regulator?

No - DDZ4V7ASF-7 is a passive two-terminal Zener diode, lacking the active feedback, adjustable output, and 1% initial accuracy of the TL431. It provides fixed 4.7 V clamping only; use only where simple, low-cost, low-current reference suffices - not for programmable or high-precision regulation.