Diodes Incorporated DDZ43S-7

Overview

DDZ43S-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 43.0 V (min 42.14 V, max 43.86 V), 5 mA test current, 90 Ω zener impedance at 2 mA, 0.05 µA reverse leakage at 33 V, and SOD323 package. It provides stable voltage reference in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.

For engineers reviewing the DDZ43S-7 datasheet, DDZ43S-7 pinout, DDZ43S-7 application, or DDZ43S-7 equivalent, key selection criteria include zener voltage tolerance (±2.0%), thermal coefficient (~+0.08%/°C), low leakage at rated VR, SOD323 footprint compatibility, and RoHS/Green compliance for automated assembly.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown with sharp knee characteristics and minimal dynamic impedance. Its zener voltage is specified at IZT = 5 mA, with guaranteed impedance ≤90 Ω measured at 2 mA - critical for maintaining regulation under varying load conditions.

The SOD323 package enables high-density PCB layouts and supports reflow soldering per J-STD-020 Level 1 moisture sensitivity. Thermal resistance (RθJA = 625 °C/W) and 200 mW power dissipation define its safe operating area under natural convection on FR-4 boards.

Key Specifications

Pinout & Package

SOD323 is a two-terminal surface-mount plastic package with cathode band marking. Terminals are matte tin–annealed alloy 42 leads; polarity is unambiguous via molded cathode stripe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C43-7-F and MMSZ43ET1G, DDZ43S-7 offers superior voltage tolerance (±2.0% vs ±3.5%/±4.7%), lower dynamic impedance, and optimized thermal performance in the compact SOD323 form factor - making it preferred for space-constrained, high-accuracy reference designs.

Availability

DDZ43S-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, switch-mode power supply feedback, and overvoltage protection requiring stable component supply, consistent parametric performance, and RoHS-compliant manufacturing.

Supply support for DDZ43S-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 specifically for high-stability voltage referencing in space-constrained, automated-assembly environments where tight tolerance, low leakage, and repeatable thermal behavior are essential.

FAQ

What is the maximum power dissipation for DDZ43S-7 under standard PCB conditions?

DDZ43S-7 has a maximum power dissipation of 200 mW when mounted on an FR-4 PCB with Diodes Incorporated's recommended pad layout. This rating assumes natural convection cooling and is derated linearly above +25°C ambient per the published power derating curve (625 °C/W junction-to-ambient thermal resistance).

How does the temperature coefficient affect voltage stability across –40°C to +125°C?

DDZ43S-7 exhibits a typical temperature coefficient of +0.08 %/°C near its 43 V operating point. Over –40°C to +125°C, this results in approximately ±0.13 V total drift (±0.3% of nominal VZ), consistent with Figure 15 in DS30414 Rev. 10–2. The coefficient is monotonic and well-characterized, enabling accurate compensation in precision systems.

Can DDZ43S-7 be used in place of a 43 V Zener in legacy through-hole designs?

No - DDZ43S-7 uses the SOD323 surface-mount package (1.30 mm × 1.70 mm) and is not a drop-in replacement for axial or DO-35 through-hole Zeners. Board redesign is required to accommodate its footprint, pad layout, and reflow soldering profile. Equivalent through-hole alternatives include 1N4751A (43 V, ±5%) but with looser tolerance and higher leakage.

Is DDZ43S-7 suitable for automotive applications per AEC-Q200?

No - DDZ43S-7 is not qualified to AEC-Q200. It is rated for industrial temperature range (–65°C to +150°C) and meets RoHS/Green standards, but lacks the stress testing, lot traceability, and failure rate validation required for automotive-grade components. For AEC-Q200-compliant 43 V Zeners, consider Diodes' AZ series (e.g., AZ43).