Diodes Incorporated DDZ30D-7

Overview

DDZ30D-7 from Diodes Incorporated is a surface-mount precision Zener diode designed for voltage regulation and reference applications in space-constrained PCBs. It delivers a tightly controlled zener voltage range of 29.02 V to 30.51 V at 5 mA test current, with maximum zener impedance of 55 Ω at 1 kHz and reverse leakage current ≤0.05 µA at 23 V, housed in an SOD123 package.

For engineers reviewing the DDZ30D-7 datasheet, DDZ30D-7 pinout, DDZ30D-7 application, or DDZ30D-7 equivalent, key selection criteria include zener voltage tolerance (±2.5%), low temperature coefficient (~+0.08%/°C), thermal resistance (425 °C/W on minimal pad), and automotive-grade qualification status (AEC-Q101 not applicable - commercial grade only).

Technical Context

This device operates as a two-terminal, reverse-biased silicon Zener diode optimized for stable DC voltage reference and overvoltage clamping. Its breakdown behavior is characterized by sharp knee conduction above 29 V with low dynamic impedance and minimal voltage drift across temperature.

Designed for single-sided FR-4 PCB mounting with minimal copper area (1 in² recommended for 470 mW dissipation), it uses a matte tin–annealed Alloy 42 leadframe and complies with RoHS 3, halogen-free, and antimony-free "Green" standards per Diodes Incorporated definitions.

Key Specifications

Pinout & Package

DDZ30D-7 is a two-terminal device in the SOD123 plastic package. The cathode is identified by a visible band on the body; the anode is the unmarked end. Terminal finish is matte tin annealed over Alloy 42 leadframe, solderable per MIL-STD-202, Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C30LT1G and MMSZ5257ET1G, DDZ30D-7 offers tighter voltage tolerance (±2.5% vs. ±5%), lower dynamic impedance (55 Ω vs. ≥75 Ω), and guaranteed halogen/antimony-free compliance - critical for medical and industrial reference designs demanding long-term stability and regulatory adherence.

Availability

DDZ30D-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, PLC input protection, and medical instrumentation reference applications requiring stable component supply, consistent parametric performance, and RoHS 3-compliant sourcing.

Supply support for DDZ30D-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, application-optimized components for industrial, computing, and consumer markets.

The DDZ series targets precision voltage reference and clamping functions in compact, automated-assembly environments - emphasizing tight V_Z tolerance, low leakage, and environmentally compliant packaging for mission-critical analog subsystems.

FAQ

What is the maximum continuous power dissipation for DDZ30D-7 on a standard PCB?

DDZ30D-7 dissipates up to 294 mW continuously when mounted on a single-sided FR-4 board with minimal 1× recommended pad layout (no extended copper pour). This derates linearly above +25°C ambient, reaching zero at +150°C per the published power derating curve (Note 8, DS30407 Rev. 21-2).

Is DDZ30D-7 qualified for automotive applications?

No. DDZ30D-7 is the commercial-grade variant (suffix "-7"). Automotive qualification requires the "Q" suffix (e.g., DDZ30DQ-7), which undergoes AEC-Q101 stress testing, PPAP documentation, and manufacturing in IATF16949-certified facilities. DDZ30D-7 lacks those certifications and is intended for industrial and consumer use.

How is polarity identified on the DDZ30D-7 package?

Polarity is marked by a distinct cathode band printed on the body of the SOD123 package. The banded end is the cathode; the opposite end is the anode. This matches JEDEC-standard orientation and must be aligned with PCB silkscreen and footprint polarity indicators during layout and assembly.

What is the typical temperature coefficient of DDZ30D-7, and how does it affect reference stability?

DDZ30D-7 exhibits a typical temperature coefficient of +0.08 %/°C (per Fig. 18, DS30407), meaning its zener voltage increases ~24 mV per 10°C rise across its rated range. This low, predictable drift allows compensation in high-accuracy references and makes it preferable to higher-TC alternatives (>±0.1%/°C) in temperature-varying environments.