Diodes Incorporated DDZ30DS-7

Overview

DDZ30DS-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 29.02–30.51 V, 5 mA test current, 55 Ω maximum zener impedance at 5 mA, 0.5 µA maximum reverse leakage at 23.0 V, and 200 mW power dissipation in SOD323 package. It provides stable voltage reference in low-power analog monitoring circuits.

For engineers reviewing the DDZ30DS-7 datasheet, DDZ30DS-7 pinout, DDZ30DS-7 application, or DDZ30DS-7 equivalent, key selection criteria include zener voltage tolerance (±2.5%), temperature coefficient (~+0.08%/°C), low leakage at rated VR, sharp breakdown knee, and compatibility with automated SMT assembly on FR-4 PCBs.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse bias above its specified zener voltage range. Its breakdown behavior is characterized by tight V_Z tolerance (±2.5% at 25°C), low dynamic impedance (55 Ω @ 5 mA), and minimal thermal drift due to positive temperature coefficient near +0.08%/°C.

The SOD323 package enables high-density placement while maintaining thermal resistance of 625°C/W to ambient under standard pad layout. Reverse leakage remains ≤0.05 µA at 23.0 V, supporting precision biasing in battery-powered sensor front-ends and ADC reference stabilization.

Key Specifications

Pinout & Package

SOD323 surface-mount package with cathode band marking; 2-terminal configuration; 0.004 g mass; UL 94V-0 molded plastic case; matte tin annealed terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C30LT1G and MMSZ5256ET1G, DDZ30DS-7 offers tighter voltage tolerance and lower dynamic impedance at its 5 mA operating point, making it optimal for low-power, high-accuracy reference roles where SOD323 footprint is required.

Availability

DDZ30DS-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, portable medical device reference, and smart energy meter voltage scaling requiring stable component supply across multi-year production cycles.

Supply support for DDZ30DS-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 and manufacturing operations across Asia and the Americas.

The DDZ series belongs to Diodes' precision Zener diode product line, engineered for high-stability voltage referencing in space-constrained, low-power applications including instrumentation, sensor interfaces, and portable electronics.

FAQ

What is the maximum reverse voltage (VR) rating for DDZ30DS-7 before significant leakage occurs?

The datasheet specifies 0.05 µA maximum reverse current at VR = 23.0 V. Beyond this, leakage rises nonlinearly; operation above 30.51 V risks uncontrolled conduction. For reliable shunt regulation, maintain VR ≤ V_Z(min) – i.e., ≤29.02 V – using appropriate series resistance.

Can DDZ30DS-7 be used in place of a 30 V Zener with ±5% tolerance?

Yes, but only if the application requires tighter regulation: DDZ30DS-7's ±2.5% tolerance (29.02–30.51 V) improves accuracy over typical ±5% parts. However, its 5 mA test current and 55 Ω impedance differ from many ±5% devices tested at 20 mA, so verify load regulation performance in-circuit.

Is the SOD323 package of DDZ30DS-7 compatible with standard 0402 pick-and-place equipment?

Yes - the SOD323 (1.30 × 1.70 mm) matches 0402 land pattern dimensions and is qualified for automated assembly. Diodes Inc. confirms compatibility with J-STD-020 Level 1 moisture sensitivity, enabling direct placement without baking, provided humidity exposure time is controlled per IPC standards.

Does DDZ30DS-7 exhibit avalanche or Zener breakdown mechanism?

At ~30 V, DDZ30DS-7 operates in the transition region where both mechanisms contribute, but its datasheet characterizes it as a Zener diode with positive temperature coefficient (+0.08%/°C), indicating dominant avalanche behavior. This yields stable, predictable regulation suitable for precision references despite the naming convention.