Diodes Incorporated DDZ9708T-7

Overview

DDZ9708T-7 from Diodes Incorporated is a surface-mount Zener diode with nominal zener voltage 22 V (min 20.9 V, max 23.1 V), 150 mW power dissipation, 50 µA test current, 0.05 µA reverse leakage at 16.7 V, and SOD523 package. It provides precise voltage regulation in low-power biasing, reference, and protection circuits for industrial sensors and power supply feedback loops.

For engineers reviewing the DDZ9708T-7 datasheet, DDZ9708T-7 pinout, DDZ9708T-7 application, or DDZ9708T-7 equivalent, this page delivers verified electrical specs, thermal derating behavior, zener impedance vs. voltage, temperature coefficient profile, and SOD523 mechanical layout - all critical for stable reference design and PCB layout validation.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable reference voltage across its terminals under controlled current conditions. Its sharp knee characteristic and low leakage (<0.05 µA at VR = 16.7 V) support high-accuracy analog sensing and low-quiescent-current regulator designs.

The device exhibits a positive temperature coefficient of approximately +0.07 %/°C near 22 V (per Fig. 18), enabling predictable drift compensation in temperature-sensitive references. Thermal resistance is 833 °C/W on FR-4 with recommended pad layout, limiting usable DC power to ~90 mW at +85°C ambient.

Key Specifications

Pinout & Package

Package: SOD523 - ultra-compact surface-mount plastic case (0.55–0.65 mm height, 0.75–0.85 mm width, 1.15–1.25 mm length), matte tin-plated alloy 42 leadframe, cathode indicated by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584C22LT1G and MMSZ5248B-TP, DDZ9708T-7 offers identical voltage tolerance and lowest profile, making it optimal for space-constrained, low-power reference designs where 150 mW and 0.05 µA leakage meet system requirements.

Availability

DDZ9708T-7 is available at Aetrix Electronics and suitable for industrial sensor biasing, low-power voltage reference, and power supply feedback applications requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.

Supply support for DDZ9708T-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, industry-standard components for power management, signal integrity, and protection.

This device belongs to the DDZ9689T–DDZ9717T Zener diode series, designed specifically for compact, low-leakage voltage reference and regulation in space- and power-constrained applications across industrial and consumer electronics.

FAQ

What is the maximum continuous reverse voltage that DDZ9708T-7 can safely clamp?

The device is rated for 22 V nominal zener voltage with a guaranteed range of 20.9 V to 23.1 V at 50 µA. Its absolute maximum reverse voltage is not specified separately; operation beyond 23.1 V risks exceeding power limits or thermal runaway. For clamping, apply only within the specified breakdown region using appropriate series resistance to limit IZ to ≤50 µA for stable regulation.

Does DDZ9708T-7 require a heatsink in standard PCB layouts?

No heatsink is required. With a thermal resistance of 833 °C/W on FR-4 and 150 mW maximum power, junction temperature rise is ~125°C at full rating - but typical operation at 50 µA yields <1.1 mW dissipation and negligible rise. The SOD523 package relies on copper pad thermal mass, not external heatsinking.

How does temperature affect the 22 V reference accuracy of DDZ9708T-7?

Per Figure 18, its temperature coefficient is approximately +0.07 %/°C near 22 V. Over –40°C to +85°C, this introduces ±8.75 mV/°C drift, totaling ~1.1 V error across the full range. For high-accuracy systems, this drift must be calibrated or compensated using matched components or software correction.

Can DDZ9708T-7 be used in place of a 24 V Zener diode for overvoltage protection?

No - its nominal 22 V rating and 23.1 V upper limit fall below the 24 V rail. Using it as a clamp would cause premature conduction and excessive current draw. For 24 V systems, DDZ9709T (24 V nominal, 22.8–25.2 V range) is the correct selection per the same datasheet family.