Diodes Incorporated DDZ9709T-7

Overview

DDZ9709T-7 from Diodes Incorporated is a surface-mount Zener diode with nominal zener voltage 24 V (min 22.8 V, max 25.2 V), 150 mW power dissipation, 50 µA test current, and 18.2 V reverse voltage rating at 0.05 µA leakage. It uses SOD523 package and serves as precision voltage reference or overvoltage clamp in low-power analog and power management circuits.

For engineers reviewing the DDZ9709T-7 datasheet, DDZ9709T-7 pinout, DDZ9709T-7 application, or DDZ9709T-7 equivalent, key selection criteria include zener voltage tolerance (±5%), low leakage (0.05 µA @ 18.2 V), thermal resistance (833 °C/W), and SOD523 footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its sharp breakdown characteristic and low dynamic impedance (typ. 120 Ω at 1 mA, per Fig. 13) support accurate regulation in feedback loops and reference networks.

The device exhibits a positive temperature coefficient (~0.07 %/°C at 24 V, inferred from Fig. 18), enabling predictable drift behavior in temperature-sensitive designs. Its SOD523 package enables automated placement while limiting junction-to-ambient thermal resistance to 833 °C/W on FR-4 board with recommended pad layout.

Key Specifications

Pinout & Package

Package: SOD523 - ultra-compact 2-pin surface-mount plastic case (0.80 mm × 0.60 mm footprint, 0.65 mm height), cathode identified by band marking, matte tin-plated alloy 42 leadframe.

Key Features

Applications

Availability

DDZ9709T-7 is available at Aetrix Electronics and suitable for industrial power monitoring, precision analog sensing, and low-power embedded voltage reference applications requiring stable component supply and full RoHS compliance.

Supply support for DDZ9709T-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 sales operations across Asia, Europe, and North America.

The DDZ9689T–DDZ9717T series belongs to Diodes' precision Zener diode product line, engineered for high-stability voltage reference and clamping in space-constrained, low-power systems where tight tolerance and low leakage are critical.

FAQ

What is the maximum reverse voltage rating for DDZ9709T-7?

The DDZ9709T-7 has a rated reverse voltage (VR) of 18.2 V at which leakage current is specified as 0.05 µA. This is not a breakdown voltage but a guaranteed upper limit for safe non-breakdown operation; actual zener breakdown occurs at 22.8–25.2 V under 50 µA test current.

Can DDZ9709T-7 be used in place of a 24 V Zener in a linear regulator feedback loop?

Yes - its 24 V nominal zener voltage, ±5% tolerance, and low dynamic impedance (~120 Ω at 1 mA) make it suitable for feedback voltage setting in adjustable LDOs or switching regulator error amplifiers, provided power dissipation remains within 150 mW and thermal design accounts for 833 °C/W RθJA.

Does DDZ9709T-7 have a specified temperature coefficient?

Yes - per Figure 18 in DS30553 Rev. 8-2, the DDZ9709T (24 V type) exhibits a typical temperature coefficient of +0.07 %/°C, indicating a predictable positive drift of ~16.8 mV/°C across its operating range of –65 °C to +150 °C.

Is the SOD523 package of DDZ9709T-7 compatible with standard pick-and-place equipment?

Yes - the SOD523 package features standardized dimensions (0.80 mm × 0.60 mm body, 0.65 mm height), matte tin-plated terminals, and Level 1 moisture sensitivity per J-STD-020D, making it fully compatible with high-speed automated assembly processes and standard reflow profiles.