Diodes Incorporated DDZ9717T-7

Overview

DDZ9717T-7 from Diodes Incorporated is a surface-mount Zener diode with nominal zener voltage of 43 V (min 40.85 V, max 45.15 V), 150 mW power dissipation, 50 µA maximum reverse leakage at 32.6 V, SOD523 package, and sharp breakdown characteristics for precision voltage regulation in low-power analog circuits.

For engineers reviewing the DDZ9717T-7 datasheet, DDZ9717T-7 pinout, DDZ9717T-7 application, or DDZ9717T-7 equivalent, this device serves as a compact, RoHS-compliant voltage reference in space-constrained power management, sensor biasing, and overvoltage protection circuits where thermal stability and low leakage are critical.

Technical Context

This Zener diode operates with a tightly controlled breakdown voltage tolerance (±5% at 43 V) and exhibits very low reverse leakage (≤0.05 µA at VR = 32.6 V), enabling stable reference performance across temperature. Its sharp knee characteristic supports accurate clamping in feedback networks.

The device uses an alloy 42 leadframe with matte tin annealed finish, rated for 833 °C/W junction-to-ambient thermal resistance on FR-4 PCBs, and meets J-STD-020D Level 1 moisture sensitivity-optimized for reflow-compatible automated assembly without preconditioning.

Key Specifications

Pinout & Package

Package: SOD523 - ultra-compact 2-pin surface-mount plastic case (0.80 mm × 0.60 mm footprint), cathode indicated by band marking, UL 94V-0 rated molding compound, weight ≈ 0.002 g.

Key Features

Applications

Availability

DDZ9717T-7 is available at Aetrix Electronics and suitable for portable sensor biasing, USB-C overvoltage clamp, and industrial PLC analog input protection requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for DDZ9717T-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, manufacturing, and distribution operations across Asia, Europe, and North America.

This device belongs to Diodes' DDZ9689T–DDZ9717T Zener diode family, engineered for high-precision, low-leakage voltage reference and clamping in miniaturized, environmentally compliant power and signal conditioning applications.

FAQ

What is the maximum reverse voltage that can be continuously applied to DDZ9717T-7 without breakdown?

The absolute maximum reverse voltage before onset of breakdown is defined by its nominal zener voltage range: 40.85 V to 45.15 V. At 25°C, sustained reverse bias below 40.85 V results in ≤0.05 µA leakage; operation above 45.15 V risks uncontrolled conduction and thermal failure unless current-limited to ≤3.5 mA.

How does the temperature coefficient affect regulation accuracy over −40°C to +85°C?

Per Figure 19, DDZ9717T-7 (43 V type) has a typical temperature coefficient of +0.08 %/°C. Over −40°C to +85°C (ΔT = 125°C), this yields ±1.0% drift (≈ ±0.43 V), making it suitable for non-critical references but not metrology-grade applications without compensation.

Can DDZ9717T-7 replace a 43 V through-hole Zener like 1N5272B in existing designs?

No direct drop-in replacement: DDZ9717T-7 uses SOD523 (0.80 mm × 0.60 mm) while 1N5272B uses DO-35 (4.5 mm × 2.2 mm). Pad layout, thermal mass, and solder profile differ significantly. Electrical behavior is comparable, but mechanical redesign and requalification are required.

Is DDZ9717T-7 suitable for use in automotive powertrain modules?

While rated for −65°C to +150°C operating temperature, DDZ9717T-7 is not AEC-Q200 qualified. It lacks stress test documentation (vibration, thermal cycling, HTRB) required for automotive powertrain use. It may be used in non-safety-critical infotainment or body electronics with customer qualification.