Diodes Incorporated DDZ9717S-7

Overview

DDZ9717S-7 from Diodes Incorporated is a surface-mount precision Zener diode in SOD-323 package, rated for 43 V nominal Zener voltage (min 40.85 V, max 45.15 V at I_ZT = 50 µA), with 0.05 µA maximum reverse leakage at 32.6 V and 200 mW power dissipation. It delivers sharp breakdown characteristics and tight ±5% V_Z tolerance, enabling stable voltage reference in low-power analog monitoring circuits.

For engineers reviewing the DDZ9717S-7 datasheet, DDZ9717S-7 pinout, DDZ9717S-7 application, or DDZ9717S-7 equivalent, key selection factors include its 43 V regulation accuracy, ultra-low leakage at rated VR, thermal resistance of 625 °C/W on FR-4, SOD-323 footprint compatibility, and RoHS-compliant matte tin terminations suitable for reflow assembly.

Technical Context

This Zener diode operates in reverse-biased breakdown mode to maintain precise DC voltage regulation under varying load and temperature conditions. Its sharp knee characteristic ensures minimal dynamic impedance variation across 1–100 mA Zener current range, supporting high-stability references in feedback networks.

The device exhibits a positive temperature coefficient near +0.09 %/°C at 43 V (inferred from Fig. 20 trend for DDZ9713S–DDZ9716S), and is characterized at thermal equilibrium (T_T = 30°C ±1°C) to guarantee repeatable V_Z measurement. Its 1.0 pF typical junction capacitance (from Fig. 10 extrapolation) minimizes AC coupling effects in high-frequency biasing applications.

Key Specifications

Pinout & Package

Package: SOD-323 - surface-mount plastic case with cathode band marking; dimensions: A = 0.25–0.35 mm (thickness), B = 1.20–1.40 mm (width), C = 2.30–2.70 mm (length), weight ≈ 0.004 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C43LT1G and MMSZ43ET1G, DDZ9717S-7 offers superior low-current regulation fidelity (50 µA test point), lower dynamic impedance, and higher power headroom-making it optimal for precision industrial and medical reference designs where stability at microamp bias levels is essential.

Availability

DDZ9717S-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive display power rails, medical infusion pump calibration, and low-power MCU auxiliary supply applications requiring stable component supply and traceable sourcing.

Supply support for DDZ9717S-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-accuracy voltage reference and regulation in space-constrained, thermally demanding applications such as industrial automation and automotive electronics.

FAQ

What is the recommended PCB pad layout for DDZ9717S-7?

The official recommended pad layout is documented in Diodes Incorporated Application Note AP02001, specifying copper land patterns optimized for thermal dissipation and solder joint reliability on FR-4. Pad width matches SOD-323 terminal width (1.2–1.4 mm), with 0.3 mm solder mask clearance and 0.2 mm stencil aperture reduction to prevent bridging. Thermal relief spokes are omitted to maximize heat transfer.

Does DDZ9717S-7 meet AEC-Q101 qualification?

No-DDZ9717S-7 is not AEC-Q101 qualified. While the datasheet notes DDZ9705S is qualified to AEC-Q101, DDZ9717S appears only in the general-purpose precision Zener table (page 2) without qualification notation. For automotive-grade use, consider Diodes' AZ-series or BZX84-Q variants explicitly certified to AEC-Q101 Rev D.

How does temperature affect the Zener voltage of DDZ9717S-7?

Based on Fig. 20 (TC vs. V_Z for DDZ9713S–DDZ9716S), the temperature coefficient for 43 V devices is approximately +0.09 %/°C. This yields ~39 mV/°C drift, meaning V_Z increases by 0.35 V over a 90°C range (–40°C to +50°C). For critical applications, this drift must be compensated via resistor network design or system calibration.

Can DDZ9717S-7 be used in series or parallel configurations?

Series connection is acceptable for higher voltage references (e.g., two DDZ9717S-7 yield ~86 V), provided current sharing is balanced via series ballast resistors. Parallel use is strongly discouraged due to mismatched V_Z tolerances and thermal runaway risk-no derating guidance is provided in the datasheet for parallel operation.